Fixed gear gear ratio calculator

The gear ratios help determine how well the machine is performing. Formula to calculate gear ratio. Example: If the driver gear has 20 teeth, and the driven gear has 40, calculate the gear ratio. Therefore, the gear ratio is 2:1. This means that, for every rotation of the driven gear, the driver gear makes two rotations.

Fixed gear gear ratio calculator. How to Use Our Calculator. Calculations are simple. Once you’ve set a predetermined time (such as ten seconds), count the number of times each of the gears rotates, then simply go to our web site and type the following: Input the number of times the ring gear rotates. Input the number of times the pinion gear rotates. Press the calculate button.

Gear Ratio. Simply put, your gear ratio compares the number of teeth in your front chainring to the number of teeth in your rear chainring. For example, at 34-tooth …

Fixed sun gear. If the sun gear is fixed (n s =0) and the gearbox input is carried out by the ring gear and the output by the carrier, the following transmission ratio …Solution. Capital gearing ratio = Common stockholders' equity / Fixed cost bearing funds. = $2,000,000/$1,500,000 *. = 4 : 3 (low-geared) * $800,000 + $700,000. L&M Limited has a low-geared capital structure. This is shown by the fact that the common stockholders' equity exceeds the fixed cost bearing funds (total of preferred stock and …The formula is: Gear ratio = Number of teeth on front chainring / Number of teeth on rear cog. For instance, if a bike has a front chainring with 40 teeth and a rear cog with 16 teeth, the gear ratio would be: Gear ratio = 40 / 16 = 2.5. This means that for every rotation of the pedals, the rear wheel rotates 2.5 times.Update 1.5: Fixed DXF resolution issue. Maximum number of teeth increased to 400. Update 1.4: TA-DA: Added internal gear support, and the ability of positioning the first gear. Update 1.3: Fixed DXF file format. On YouTube. Finally some videos I found on youtube: Gear Generator How to Draw Perfect Gears (4:23) Laser Cut Gears (3:08)The Fixed Gear Bike Ratio Calculator provides you with a clear and easily understandable gear ratio value. This numerical output is crucial for cyclists as it offers …

October 9, 2023 by GEGCalculators. Mini bike gear ratios vary based on factors like engine power, tire size, and intended use. Common gear ratios range from 4:1 for high torque to 8:1 for high speed. Selecting the right gear ratio depends on your specific riding preferences and requirements, balancing between acceleration and top speed.Common gear ratios for commuting are a 44 or 46 teeth chainring combined with a 16 teeth sprocket (denoted 44:16 or 46:16). For slow pace or hilly commutes, 44:16 or 46:18 may be ideal. But lower is not always better. Flat, open road commutes may be easier to cover with a higher ratio like 46:16. It’s important to experiment for yourself with ...Gear Ratio RPM Calculator. Last updated: May 01, 2024. Gear Ratio RPM Calculator. Created by Vishnuvardhan Shakthibala. Reviewed by Rijk de Wet. 51 people …Planetary gearing consists of three elements: a sun gear, a ring gear and a number of planet gears mounted on a carrier. One of these elements is always fixed, one is an input and one is an output. Select gear sizes below and hit CALCULATE to see ratios for all three cases.About External Resources. You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.Graphical gear calculator for bicycle gearing systems. Includes derailleur gears and internal gear hubs. Grafischer Ritzelrechner zur Berechnung der Entfaltung von Fahrradschaltungen.

For fixed-gear bikes, some jurisdictions require at least one functioning brake, typically a front brake, to be considered road-legal. It's essential to check the specific laws and regulations in your area to ensure your fixed-gear bike complies with local requirements.Common gear ratios for commuting are a 44 or 46 teeth chainring combined with a 16 teeth sprocket (denoted 44:16 or 46:16). For slow pace or hilly commutes, 44:16 or 46:18 may be ideal. But lower is not always better. Flat, open road commutes may be easier to cover with a higher ratio like 46:16. It’s important to experiment for yourself with ...3 days ago · Step 3: Calculate Gear Ratio. After entering all the necessary values, proceed to click the “Calculate Gear Ratio” button. Step 4: Interpret the Result. The calculator will process your inputs and exhibit your calculated gear ratio in the “Result” section of the webpage. Typically, the gear ratio is represented as a decimal number. The gear ratio is the relationship between the number of teeth on two gears that are meshed or connected. In a compound planetary gear system, the calculation becomes more complex as there are multiple gears involved. The gear ratio is often calculated using the formula (Ring gear teeth + Sun gear teeth) / Sun gear teeth.the center of the planets (half of the mesh speed) divided by the diameter of the carrier. The gear ratio would thus be D Carrier /(D Sun /0.5) ... they would align at every tooth, and since one is fixed, the other would not move either. However since the fixed gear has one extra tooth, every time the planets make a full revolution around the fixed gear, …Input Your Values: Commence by accurately entering the values into their respective fields on the calculator form. Click “Calculate Gear Ratio”: Once all the values have been inputted, proceed to click the “Calculate Gear Ratio” button. Interpreting the Result: The calculator will promptly generate your calculated gear ratio ...

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Tableau des skid patchs. Le ratio correspond au nombre de dents du pédalier divisé par le nombre de dents du pignon, plus ce chiffre est élevé plus le pédalage deviendra difficile au démarrage et en côte mais plus il sera possible de monter en vitesse. A l’inverse un ratio bas permettra un démarrage facile, l’absorption de ...How to calculate the gear ratio in a planetary gear set where one member is stationary Step-3: By Multiplying gear-ratio between 1 to 2 and 2 to 3. We will get resultant GR between Driver and Driven Gear. Resultant Multi Gear Train GR = 0. 5 × 0.5 = 0.25. From the above, calculated gear ratio we can calculate the speed and torque at output gear. How to Calculate Ratios. In order to keep numbers in direct relation you should first divide or multiply, which depends on your task, them in the ratio. Therefore, a ratio of 8/6 is an equivalent ratio of 4/3: in that particular ratio calculation, you should just multiply 4, as well as 3, by 2. You may also want to try our Aspect Ratio Calculator.

Schlumpf Speed and Rohloff. Wheel Circumference (MM) Chainwheel Teeth. Chainwheel Teeth. Chainwheel Teeth. Rear Cog Teeth.Oct 9, 2023 · October 9, 2023 by GEGCalculators. Mini bike gear ratios vary based on factors like engine power, tire size, and intended use. Common gear ratios range from 4:1 for high torque to 8:1 for high speed. Selecting the right gear ratio depends on your specific riding preferences and requirements, balancing between acceleration and top speed. The pitch diameter of a gear is just the number of teeth divided by diametrical pitch (larger values of "diametrical pitch" mean smaller teeth). The gear generator program tends to refer to tooth spacing. Pitch diameter can also be calculated as tooth spacing * number of teeth / (2*π), where 2*π = 6.283. Here's another planetary gear set.Also calculates metres of development and (optionally) speed or cadence, and gain ratio. Bicycle 'gear inches' is equivalent to the diameter of the drive wheel on a direct-drive bicycle with pedals fixed to the wheel, or when the number of teeth on the chainring and the sprocket are the same: a 1 to 1 drive. Gear inches is used mostly for ...Jan 10, 2024 · Calculate your bike gear ratio for your fixed gear bike. Use our free calculator now. How to Use the Bicycle Gear Inches Calculator. Using the Bicycle Gear Inches Calculator is simple and straightforward. Here’s how: Step 1: Select the Rim Size. Choose the size of your bike’s rim from the drop-down menu. Gearbox Ratio = Number of Teeth on Driven Gear / Number of Teeth on Driving Gear = 80 / 20 = 4. In this example, the calculated gearbox ratio is 4. This means that for every revolution of the driving gear, the driven gear will rotate four times. The gearbox provides a speed reduction of 4:1. The gearbox ratio calculation is used in various real ...How to Use Our Calculator. Calculations are simple. Once you’ve set a predetermined time (such as ten seconds), count the number of times each of the gears rotates, then simply go to our web site and type the following: Input the number of times the ring gear rotates. Input the number of times the pinion gear rotates. Press the calculate button.P/E ratio, or price-to-earnings ratio, is a quick way to evaluate stocks. A good P/E ratio depends on the sector, but generally the lower, the better. Calculators Helpful Guides Co...Generally tires squat about 3%. If you are using the calculated diameter, multiply that number by .97 to get a more accurate reading. If you are measuring your tire, measure from flat ground up to the center of the hub and multiply that number by 2. Easy to use gear ratio calculator. Use our gear ratio calculator to find the correct gear ratio ... Calculate. [/fstyle] Formula: Unlock the mystery of gears with this formula that’s smoother than a well-oiled cog: Gear Ratio = Number of Teeth on Driven Gear / Number of Teeth on Driving Gear. Ready to dive into the fascinating world of gear ratios? Let’s gear up and go! The gear ratios help determine how well the machine is performing. Formula to calculate gear ratio. Example: If the driver gear has 20 teeth, and the driven gear has 40, calculate the gear ratio. Therefore, the gear ratio is 2:1. This means that, for every rotation of the driven gear, the driver gear makes two rotations. Generally tires squat about 3%. If you are using the calculated diameter, multiply that number by .97 to get a more accurate reading. If you are measuring your tire, measure from flat ground up to the center of the hub and multiply that number by 2. Easy to use gear ratio calculator. Use our gear ratio calculator to find the correct gear ratio ...

Ran 49/15 for a bit then went 49/17. I plan to start using 52/17 and 52/19 on a fx/fx hub. 52/19 for stop/go, and 52/17 for longer rides. Both of these ratios have a fair amount of skid patchs (52/17 having 17 and 51/19 having 19, and having 34/38 if you skid ambi), aren't terribly steep, and are good all around ratios.

Our bike gear calculator can show the ratios for the range of chainrings and cogs teeth so that you can check your bike gear ratios and gear inches in different settings: Choose the minimal value of the teeth in the chainring. Let's say it's 42. Pick the maximum number, 48, for example.Generally tires squat about 3%. If you are using the calculated diameter, multiply that number by .97 to get a more accurate reading. If you are measuring your tire, measure from flat ground up to the center of the hub and multiply that number by 2. Easy to use gear ratio calculator. Use our gear ratio calculator to find the correct gear ratio ...Even toothed gears only? Tire Size: 20mm 23 25 26 27 28 30 32 35 37 38 40 42 44 45 50 56 1.00inch 1.25 1.35 1.40 1.50 1.75 1.90 1.95 2.00 2.10 2.125 2.20 2.25 2.30 2.35 2.40 …A bike’s gear ratio is the number of teeth on the front sprocket relative to the back sprocket. The number of teeth on the front and rear sprockets together determines the bike’s gear ratio, which affects how hard or easy it is to pedal and its top speed. Most fixed-gear bikes come standard with a chainring and sprocket of 46 teeth and 16 ...Feb 4, 2021 ... The bike I ride, channel sponsor, pretty cool people: https://wabicycles.com/ Mildly ironic Reasonably Dangerous cycling shirts: ...Jul 12, 2022 · The gear ratio is a quantity defined for each couple of gears: we calculate the gear ratio as the ratio between the circumference of the driving gear to the circumference of the driven gear: Where d_i di is the diameter of the i^ {\text {th}} ith gear. As you can clearly see, we can simplify this equation in two ways. To determine the gear ratio of a particular gear combination, all you need to do is divide the number of teeth on the front chainring by the number of teeth on the rear cassette. For example, if your bike has a front chainring with 50 teeth and a rear cassette with 11 teeth, the gear ratio would be: 50 / 11 = 4.55.So, one revolution of the pedals at a gear ratio of 39/28 will take you 3.23 meters (2.31 x 1.4). If you multiply this figure by your cadence – let’s say 100 rpm in this case – you can calculate the speed. In this example, the bike would be traveling at 19.4 km/h (3.23 m x 100 rpm x 60 minutes). Note that other factors affecting speed ...Step-by-Step Guide to Using Our Bike Gear Ratio Calculator. Follow these simple steps to determine your optimal gear ratios using our bike gear ratio calculator: Select the Min and Max number of teeth on your bike’s chainrings. Select the the Min and Max number of teeth on your bike’s Cog. Click “Calculate” to generate a list of gear ...

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Kick in high gear with our gear ratio calculator: here, you will learn how gear multiplies speed and torque using only a couple of simple mathematical formulas. Keep reading our article to find out: What is a gear? What is the gear ratio? How to find the gear ratio of a gear train;Gear Ratio. Count the number of teeth on the front cog of your bicycle, and select this value in the picker labeled chainring. Then do the same on your rear cog for the picker labeled sprocket. Gear Inches. Following on the steps to calculate the gear ratio, measure in millimeters the thickness of your rear tire across its tread when inflated ...Simply select a vehicle, and it will prefill the fields in the calculator (Optional) Speed: Choose between mph or km/h. Tyre Size: Enter your tyre size or Outer Diameter (inches). Max rpm: Enter your maximum engine rpm limit. Final Ratio: Enter your final drive ratio. Gear Ratio: Enter the gear ratio for each gear.Profitability ratios help investors, bankers, and entrepreneurs gauge the health and sustainability of their businesses. Trusted by business builders worldwide, the HubSpot Blogs a...There's no one metric to show whether a stock is a good investment, but the P/E ratio is a good place to start your research. By clicking "TRY IT", I agree to receive newsletters ...The ratio of chainring teeth to rear sprocket teeth, in other words, how many times your rear wheel turns with each revolution of the pedals. For example : - ratio < 1,9 : Bike polo - …How to Calculate Ratios. In order to keep numbers in direct relation you should first divide or multiply, which depends on your task, them in the ratio. Therefore, a ratio of 8/6 is an equivalent ratio of 4/3: in that particular ratio calculation, you should just multiply 4, as well as 3, by 2. You may also want to try our Aspect Ratio Calculator.Learn about debt-to-income and use our free DTI calculator to divide your monthly income by your monthly debt payments. By clicking "TRY IT", I agree to receive newsletters and pro...Fixed sun gear. If the sun gear is fixed (n s =0) and the gearbox input is carried out by the ring gear and the output by the carrier, the following transmission ratio …Step 3: Calculate Gear Ratio. After entering all the necessary values, proceed to click the “Calculate Gear Ratio” button. Step 4: Interpret the Result. The calculator will process your inputs and exhibit your calculated gear ratio in the “Result” section of the webpage. Typically, the gear ratio is represented as a decimal number. ….

How to Use Our Calculator. Calculations are simple. Once you’ve set a predetermined time (such as ten seconds), count the number of times each of the gears rotates, then simply go to our web site and type the following: Input the number of times the ring gear rotates. Input the number of times the pinion gear rotates. Press the calculate button.The following instructions aim to assist you in effectively using our gear inches calculator, ensuring a more seamless and informed experience. Count the number of teeth on the front cog of your bicycle, and select this value in the picker labeled chainring. Do the same on your rear cog for the picker labeled sprocket.Suppose a vehicle with a 700R4 transmission has a drive gear with 15 teeth, an axle ratio of 3.73, and tires with a diameter of 28 inches. Using the formula provided, we can calculate the number of driven teeth required for accurate speedometer readings. Driven Teeth = (15 * 3.73 * (63360 / (28 * 3.14159))) / 1000.Tableau des skid patchs. Le ratio correspond au nombre de dents du pédalier divisé par le nombre de dents du pignon, plus ce chiffre est élevé plus le pédalage deviendra difficile au démarrage et en côte mais plus il sera possible de monter en vitesse. A l’inverse un ratio bas permettra un démarrage facile, l’absorption de ...Jun 10, 2018 ... Why Is This the Most Popular Fixed Gear Ratio ... How to Increase Your Fixed Gear Ratio WITHOUT DESTROYING Your Knees ... HOW TO CALCULATE GEAR ... Download BikeCalc on the App Store. Combining precise calculations and an intuitive design, BikeCalc provides you everything you need to analyze and optimize the gearing on your bicycle, saving you time, guesswork and potentially a costly mistake. Get the App. Calculate gear ratios given chainring and sprocket (cog) sizes. Select gear sizes below and hit CALCULATE to see ratios for all three cases. Sun gear: Select 8 teeth 12 teeth 14 teeth 16 teeth 20 teeth 24 teeth 28 teeth 36 teeth 40 teeth 56 teeth 60 teeth Ring gear: Select 24 teeth (inside of a 56t turntable) 48 teeth (Power Miners wheel) 60 teeth (small 4-piece ring gear) 140 teeth (large 4-piece ring gear) 168 teeth (Hailfire … Fixed gear gear ratio calculator, Solution. Capital gearing ratio = Common stockholders' equity / Fixed cost bearing funds. = $2,000,000/$1,500,000 *. = 4 : 3 (low-geared) * $800,000 + $700,000. L&M Limited has a low-geared capital structure. This is shown by the fact that the common stockholders' equity exceeds the fixed cost bearing funds (total of preferred stock and …, A reserve ratio formula is used for calculating how much money banks can loan out as a percentage of the deposits they have on hand. It takes into account the required reserve rati..., To get the reduction ratio for both gears, we want each gear ratio to be about the square root of 12, which is about 3.464. Now 8 * 3.464 is 27.7. So lets try 28 teeth for the intermediate gear. So we can write 8:28:96 or 8:28 and 28:96 We can divide the right side by 4, so we get 8:28 and 7:24., First Steps. To make calculating planetary gear ratios as simple as possible, note the number of teeth on the sun and ring gears. Next, add the two numbers together: The sum of the two gears’ teeth equals the number of teeth on the planetary gears connected to the carrier. For example, if the sun gear has 20 teeth and the ring gear has 60 ..., Fixed gear visual calculator. This calculator uses the same visual style of the main calculator, but has added features for fixed gear applications. (in progress) SS/FG gear calculator. The original kstoerz calculator. This provides a unique way to compare and select gear ratios for singlespeed and fixed gear drivetrains. Other Stuff Ruler Tool, Download BikeCalc on the App Store. Combining precise calculations and an intuitive design, BikeCalc provides you everything you need to analyze and optimize the gearing on your bicycle, saving you time, guesswork and potentially a costly mistake. Get the App. Calculate gear ratios given chainring and sprocket (cog) sizes. , Step-3: By Multiplying gear-ratio between 1 to 2 and 2 to 3. We will get resultant GR between Driver and Driven Gear. Resultant Multi Gear Train GR = 0. 5 × 0.5 = 0.25. From the above, calculated gear ratio we can calculate the speed and torque at output gear., Typical Epicyclic Gear Arrangement. There are three configurations possible with this epicylic gear. Star where the planet carrier arm is fixed and the sun and annulus ring gear rotate. Fixed frame assembly Input and output shaft rotate in opposite directions Ratios up to 10:1 (approx)-- (Reduction or increase depending on drive direction.), Gears are used to increase the force or speed and gear ratio is a unit of bike gearing. To calculate the gear ratio, divide the number of teeth on the front chainring by …, Also calculates metres of development and (optionally) speed or cadence, and gain ratio. Bicycle 'gear inches' is equivalent to the diameter of the drive wheel on a direct-drive bicycle with pedals fixed to the wheel, or when the number of teeth on the chainring and the sprocket are the same: a 1 to 1 drive. Gear inches is used mostly for ..., Gear ratio. Since fixed-gear bicycles do not have the capability to change gears on the fly, riders must choose their preferred gear ratio beforehand. A commonly used gear ratio that works well in most situations is 2.75:1, which can be implemented with a 44-tooth chainring and a 16-tooth rear sprocket. Competition, The Performance Bike Gear Ratio Calculator is a valuable tool suitable for cyclists at all skill levels. It empowers you to optimize your bike’s gear ratio for improved performance, efficiency, and riding comfort. By adhering to the steps outlined in this guide, even individuals new to cycling can effectively utilize the calculator to enhance ..., Fixed gear visual calculator. This calculator uses the same visual style of the main calculator, but has added features for fixed gear applications. (in progress) SS/FG gear calculator. The original kstoerz calculator. This provides a unique way to compare and select gear ratios for singlespeed and fixed gear drivetrains. Other Stuff Ruler Tool , Download BikeCalc on the App Store. Combining precise calculations and an intuitive design, BikeCalc provides you everything you need to analyze and optimize the gearing on your bicycle, saving you time, guesswork and potentially a costly mistake. Get the App. Calculate gear ratios given chainring and sprocket (cog) sizes. , Update 1.5: Fixed DXF resolution issue. Maximum number of teeth increased to 400. Update 1.4: TA-DA: Added internal gear support, and the ability of positioning the first gear. Update 1.3: Fixed DXF file format. On YouTube. Finally some videos I found on youtube: Gear Generator How to Draw Perfect Gears (4:23) Laser Cut Gears (3:08), FixMeUp! is software that helps you figure out what gears will fit on your fixed-gear or single-speed bike. It's particularly useful for bike frames with vertical dropouts, because on those frames you can't just move the rear wheel to take up slack in the chain., A fixed-gear bicycle (sometimes called a fixie) is a bike with no freewheel system. On a fixie, you must constantly pedal the bike to move forward or stay upright. Most fixies only include a single front brake because riders lock their legs to slow down or stop the cycle. In this article., A simple gear ratio calculator to find the speed and mechanical advantage of a gear system of spur gears. Gear ratio is determined solely by the number of teeth on each gear. Check the box if the gear is on the same shaft as the gear above it, leave it unchecked if the gear meshes with the gear above it. Input Speed (rpm), The Sortino Ratio is a tool for measuring the risk-adjusted return of an investment. It only factors in downside volatility, unlike the Sharpe Ratio. Calculators Helpful Guides Com..., Generally tires squat about 3%. If you are using the calculated diameter, multiply that number by .97 to get a more accurate reading. If you are measuring your tire, measure from flat ground up to the center of the hub and multiply that number by 2. Easy to use gear ratio calculator. Use our gear ratio calculator to find the correct gear ratio ..., The bicycle gear ratios calculator is a tool that can be used to find the ideal gearing for your bike, based on your preferred cadence and the type of riding you will be doing. To use the calculator, you will need to know the following information: The size of your bike wheel; The width of your tires;, A low gear ratio will result in a higher speed but lower torque. How To Calculate Gear Ratio? Below are the gear ratio equations to calculate the gear ratio so, follow these for manual calculation. Gear Ratio Equations: Let’s have a look at the relative equations that you could use to calculate the gear ratio accurately. Formula # 1:, Let’s say your largest acceptable ring gear has 100 teeth, and your largest acceptable planet has 45 teeth, your largest possible reduction (assuming all your gears are of the same module – using different modules in the two stages, one can attain higher gear ratios) will be 1/[1-(44*100)/(45*99)] = 81 to 1., The gear ratio determines the gear that the bike is in and how much resistance is felt when pedalling. A high gear ratio means that the bike is in a harder gear, which makes it harder to pedal but allows the bike to go faster. A low gear ratio means that the bike is in an easier gear, which makes it easier to pedal but limits the bike’s speed., Common gear ratios for commuting are a 44 or 46 teeth chainring combined with a 16 teeth sprocket (denoted 44:16 or 46:16). For slow pace or hilly commutes, 44:16 or 46:18 may be ideal. But lower is not always better. Flat, open road commutes may be easier to cover with a higher ratio like 46:16. It’s important to experiment for yourself with ..., However, certain gear ratios have become popular in the fixed gear community due to their balanced performance characteristics. Here are a few examples: 2.75 (44/16): This is a versatile ratio often chosen by street cyclists. It balances speed and agility well, allowing for comfortable cruising and quick accelerations. , Gear Ratio Calculator. This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs within operating ranges of the vehicle. This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. Disclaimer: This form is only to be used for ..., Gear inches can be calculated using the following formula: Gear inches = (Diameter of the drive wheel x Number of teeth on the chainring) / Number of teeth on the cog. To increase gear inches, you can either increase the number of teeth on your chainring or decrease the number of teeth on the cog. Keep in mind that changing your tire width will ..., Gears are used to increase the force or speed and gear ratio is a unit of bike gearing. To calculate the gear ratio, divide the number of teeth on the front chainring by …, Compare two different bicycle drivetrains side-by-side. Supports any number of chainrings and cogs, as well as many popular internally-geared hubs. Results can be displayed as gear inches, metres development, or Sheldon Brown's gain ratios., Divide the number of teeth on each "driven" gear by the number of teeth on the "drive" gear for each interlocking set of gears to calculate the intermediate gear ratios. In our example, the intermediate gear ratios are 20/7 = 2.9 and 30/20 = 1.5. Note that neither of these are equal to the gear ratio for the entire train, 4.3., The formula used in the Gear Velocity Calculator is: Velocity = (2 * π * Pitch Diameter * Rotational Speed) / 60. Where: Velocity is the linear velocity of the gear in units per minute or units per second, depending on the units used for the rotational speed and pitch diameter. π (pi) is a mathematical constant approximately equal to 3.14159., The formula is: Gear ratio = Number of teeth on front chainring / Number of teeth on rear cog. For instance, if a bike has a front chainring with 40 teeth and a rear cog with 16 teeth, the gear ratio would be: Gear ratio = 40 / 16 = 2.5. This means that for every rotation of the pedals, the rear wheel rotates 2.5 times.