Fixed gear gear ratio calculator

19-11-2002 – V1.02 – Fixed pulldowns so they don’t disappear off the screen. Gear Chart 23-02-2010 – Improved usability, better formatting and highlighting. Mouse over highlights the cell to give you a summary. Tioga Specific gear chart and calculator Finally you can work out the ratios specifically for your PowerBlock and Comp III tyres.

The three basic components of the epicyclic gear are: Sun: The central gear. Planet carrier: Holds one or more peripheral planet gears, all of the same size, meshed with the sun gear. Annulus: An outer ring with inward-facing teeth that mesh with the planet gear or gears. The overall gear ratio of a simple planetary gearset can be reliably ...Step 1. Gather Your Gear Info. Start by checking your bike’s gears. Count the teeth on the front gear (attached to the pedals) and the rear gear (connected to the wheel). Knowing your gear setup is key! Step 2. Input Gear Details. Type in the number of teeth for the front and rear gears in the designated fields.Jun 21, 2018 ... Gear to help you whip out skidz: https://kit.com/ZachGallardo/guide-to-skidding-on-a-fixed-gear Get exclusive behind the scenes access by ... Wheel circumference = (622 + 23 × 2) × pi = 2098.58 mm. The gear ratio is the number of chainring divided by the cassette. The rest is a matter of unit conversion. To get a result in km/h, multiply the formula by 60 and divide by 1,000,000. To get a result in mph, divide the km/h by 1.609. 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 …A lack of financial literacy cost Americans $352 Billion in 2021. However, there are steps you can take to increase your literacy and save money. Calculators Helpful Guides Compare...Calculating ratios by using the instantaneous planet gear velocities. This method analyses the motion of one planet gear. The centre moves at the same velocity as the carrier , the pitch velocity at the teeth mating with ring is the same as that of the pitch velocity of the ring and the pitch velocity of the teeth in contact with the sun gear moves at the same …

To calculate the size of the lowest gear you need, you should begin by determining what speed you can maintain on a certain climb and what pedaling cadence is tolerable. ... That’s a gear ratio of 4.17:1, so a highest gear ratio of around 4:1 should be sufficient for ultra-distance cycling. James Hayden, the winner of the 2017 TCR, came to the same …Lego Technic Gear Ratio Calculator. This is a free online app to find gear sequences for a given transmission ratio. Features. Specify a list of available gears. Exact and approximate search. Exclude connections that can't be easily built with real parts. Supply fixed gear sequences at the start and end of the generated sequence.The Basics of Gear Ratios Gear Ratio Fundamentals. Embark on your journey to mastering gear ratios. Explore the fundamental concepts that lay the groundwork for accurate calculations. Why Gear Ratios Matter. Uncover the significance of gear ratios in various machinery and automotive applications. Learn how they optimize performance and efficiency.Bottom gear / Top gear = Gear Ratio. Example 43/27 = 1.59 ratio – Note that gears are generally discussed with mentioning the top gear first like “Twenty. seven, fourty three” Gears are displayed in text as 27:43 with a ” : ” to separate the values. More examples, 44 / 24 = 1.83 ratio and then written and spoken as 24:44 Bottom gear / Top gear = Gear Ratio. Example 43/27 = 1.59 ratio – Note that gears are generally discussed with mentioning the top gear first like “Twenty. seven, fourty three” Gears are displayed in text as 27:43 with a ” : ” to separate the values. More examples, 44 / 24 = 1.83 ratio and then written and spoken as 24:44 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)Nov 10, 2021 · This relationship is called the gear teeth – pinion teeth ratio or the gear ratio. This ratio can be expressed as the number of gear teeth divided by the number of pinion teeth. So in this example, since there are 54 teeth on the larger gear and 18 teeth on the pinion. There’s a ratio of 54 to 18 or 3 to 1 this means that pinion is turning ... Powerful featuresfor every cyclist. BikeCalc makes it easy to optimize the gearing on your bicycle. You can also calculate your speed at a particular cadence for each gear. Plus, you can manage all your gearing configurations in one place. And there are articles helping you every step of the way. 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.Calculating ratios by using the instantaneous planet gear velocities. This method analyses the motion of one planet gear. The centre moves at the same velocity as the carrier , the pitch velocity at the teeth mating with ring is the same as that of the pitch velocity of the ring and the pitch velocity of the teeth in contact with the sun gear moves at the same …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.

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The following instructions aim to assist you in effectively using our gear ratios 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.27-01-2006 – V1.03 – Increased the range of gears 19-11-2002 – V1.02 – Fixed pulldowns so they don’t disappear off the screen. Gear Chart 23-02-2010 – Improved usability, better formatting and highlighting. Mouse over highlights the cell to give you a summary. Tioga Specific gear chart and calculator Finally you can work out the ...Gear Ratios. BikeCalc offers a wide range of gear sizes for BMX, CX, MTB, road bikes, track bikes, fixies, recumbents and many more. Learn More. Gear Inches. BikeCalc …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.But when you only get one gear, it’s got to be the right one! I advise single-speed bike riders to start with a gear ratio of: 1.8:1–2:1 on mountain bikes. 2.2:1–2.4:1 on city & cruiser bikes. 2.5:1–2.7:1 on road & hybrid hybrid bikes (with a freewheel) 2.7:1–2.8:1 on fixed-gear road bikes. Many mountain bikers go lower, and many road ...To find the output torque and speed of a gear reducer, use these. gear ratio formulas: Ouput Torque = Input Torque x Ratio of Gear Reduction. Torque is measured in Inch Pounds. Output Speed = Input Speed / Ratio of Gear Reduction. Example: A gear reducer with 1000 in/lbs of input torque, an input. speed of 2000 RPM, and a reduction ratio of 3.5 ...

(Chainring Teeth / Cog Teeth) x Rear Wheel Diameter (wheel & tire) = gear inches. Gear-inches are useful because you’re given a numerical value for your specific setup compared to all others. Knowing your bike’s gear-inch measurement allows you to make better decisions when customizing your gearing. Gear Ratio. 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 ...Cycling is a great way to stay active and explore the outdoors. However, with so many different types of bikes available, it can be difficult to know which one is right for you. Tw...3 days ago · Multiply the gear speed in rad/s by 60; Now divide the obtained quantity from step 1 by 2π to obtain the gear speed in revolution per minute (rpm); and. Cool!, Now you can easily convert the gear speed in rad/s to rpm. Input gear teeth number. The number of teeth on your input gear, a.k.a. your driving gear. Multiply the gear speed in rad/s by 60; Now divide the obtained quantity from step 1 by 2π to obtain the gear speed in revolution per minute (rpm); and. Cool!, Now you can easily convert the gear speed in rad/s to rpm. Input gear teeth number. The number of teeth on your input gear, a.k.a. your driving gear.Nov 10, 2021 · This relationship is called the gear teeth – pinion teeth ratio or the gear ratio. This ratio can be expressed as the number of gear teeth divided by the number of pinion teeth. So in this example, since there are 54 teeth on the larger gear and 18 teeth on the pinion. There’s a ratio of 54 to 18 or 3 to 1 this means that pinion is turning ... The Optimum Rearend Ratio Calculator is a powerful tool designed to determine the ideal rear-end gear ratio for a vehicle. This ratio plays a critical role in the performance of a vehicle, affecting its acceleration, top speed, and fuel efficiency.By inputting a few key parameters, users can calculate the optimum rear-end gear ratio …A Gear Ratio Calculator is a specialized tool used to determine the gear ratio of a mechanical system, such as a gearbox, transmission, or drivetrain. Gear ratios play a crucial role in the functioning of various machines and vehicles, impacting factors like speed, torque, and mechanical advantage. Here, we’ll explore the purpose, features ...Gear Ratio Calculator. Ring-and-pinion selection made easy! Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info (example: 5000 RPM), press calculate, and you’ll get the right ratio without the guesswork. Solve For: Gear Ratio (ex. 4.56) RPM (ex. 5000) Tire Diameter (in.) (ex. 28) MPH (ex. 45) *** Calculated …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 …

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 - …

Gear Ratios. BikeCalc offers a wide range of gear sizes for BMX, CX, MTB, road bikes, track bikes, fixies, recumbents and many more. Learn More. Gear Inches. BikeCalc …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 ...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.Apr 25, 2024 · The Fixed Gear Bike Ratio Calculator is a valuable tool that simplifies the process of calculating your gear ratio. Let’s Get Started. To make the most of the Fixed Gear Bike Ratio Calculator, follow these straightforward steps: Step 1: Gather Essential Data. Before you begin, it’s essential to gather specific information: Aug 29, 2014 ... How to work out good tooth counts to come up with a desired gear ratio for multi-stage gearing. http://woodgears.ca/gear/ratio.html The gear ...Dec 28, 2021 ... magic ratio calculator: https ... Single Speed Gear ratio again. Ride4life ... How to Choose the Fixed/Singlespeed Gearing Best for YOU | Fixed Gear ...2. Break down the event/discipline and work out which energy system you will mostly be utilising and what’s achievable in terms of an average cadence over the total time of the event. 3. For shorter, more sprint type events, run a few trials on different gear ratio’s to work out your maximum power output and drop off over 30 seconds. 4.

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Net fixed assets are calculated with the following formula: fixed asset purchase price + additions to existing assets – accumulated depreciation – accumulated asset impairment – li...In an interest rate swap, the absolute rate is the sum of the fixed rate component and the variable bank rate. In an interest rate swap, the absolute rate is the sum of the fixed r...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 ...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.Oct 15, 2020 · 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 ... 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 ...Fixed Gear bikes can be ridden on tracks or roads, but they tend to be less maneuverable than other types of bicycles. Here is the fixed-gear bike size chart: Rider Height. Rider Inside Leg. Bike Size. 5’1″ – 5’3″. 27″ – 29″. 48cm. 5’3″ – 5’5″.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. 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. Calculate fixed gear skid patches for single-legged or ambidextrous skidders. 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.To calculate differential gear ratio, divide the ring gear tooth count by the pinion gear tooth count. For example, after counting, you have 41 ring gear (larger gear) teeth and 11 pinion gear (smaller gear) teeth. To calculate gear ratio, you will put into a calculator (if needed) 41 divided by 11. This equals 3.73. This combination provides an …Following a recipe is a great way to get started in the kitchen. However, once you’ve gotten the hang of combining ingredients, you can employ a few choice ratios that govern dozen... ….

Gear Ratio Calculator. Ring-and-pinion selection made easy! Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info (example: 5000 RPM), press calculate, and you’ll get the …Remember, if you want to calculate the ratio for a gearing combination that’s not included in these charts, simply divide the number of teeth on the chainring by the …A lack of financial literacy cost Americans $352 Billion in 2021. However, there are steps you can take to increase your literacy and save money. Calculators Helpful Guides Compare... 4. Input the center distance between the pinion and the gear. 5. If needed, also input the gear cutting tool's tip rounding radius coefficient. 6. Input the number of teeth of the pinion and the gear. 7. Enter the precision grades of the two gears as well as absence or existence of tooth form correction (s). 8. 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.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.The gear ratio gives us an idea of how much an output gear is sped up or slowed down or how much torque is lost or gained in a system. We equipped this calculator with the gear ratio equation and the gear reduction equation so you can quickly determine the gear ratio of your gears.To use this online calculator for Gear Ratio given Number of Teeth, enter Number of Teeth on Spur Gear (z) & Number of Teeth on Pinion (zp) and hit the calculate button. Here is how the Gear Ratio given Number of Teeth calculation can be explained with given input values -> 2.5 = 30/12. Fixed gear gear ratio calculator, The Gear Ratio Calculator can be an excellent tool for budding robotic engineers and students to experiment with these principles. Using the Gear Ratio Calculator is straightforward. Simply input the number of teeth for the driving (input) gear and the driven (output) gear, and the calculator instantly provides you with the gear ratio., Enter the maximum potential safe engine RPM. Enter the tire size diameter and the target vehicle speed in MPH. Click on Calculate Differential Gear Ratio. The value will be returned in estimated differential gear ratio, based on the entered values. To do another, click the Clear Values button and then enter a new set of values. Calculated ..., One of the vital statistics of a company or an individual is called the debt-to-equity ratio. But the key is knowing how to interpret this important metric in relation to future ne..., Aug 29, 2014 ... How to work out good tooth counts to come up with a desired gear ratio for multi-stage gearing. http://woodgears.ca/gear/ratio.html The gear ..., Calculating Gear Ratios for Planetary Gears. Determining the gear ratio for planetary gears can be accomplished through a simple formula: Gear Ratio = (Number of Teeth on Ring Gear + Number of Teeth on Sun Gear) / Number of Teeth on Sun Gear. Let’s break it down with an example. If a ring gear boasts 80 teeth and the sun gear …, (Chainring Teeth / Cog Teeth) x Rear Wheel Diameter (wheel & tire) = gear inches. Gear-inches are useful because you’re given a numerical value for your specific setup compared to all others. Knowing your bike’s gear-inch measurement allows you to make better decisions when customizing your gearing. Gear Ratio., By EngineerExcel. Planetary gear systems are a type of gear train configuration where a central gear, called the sun, meshes with and is surrounded by planet gears, which in turn mesh with an outermost gear called the ring gear. Due to their advantages of high efficiency, compactness, and high power-to-weight ratios, they are widely used in ..., Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Select the value you want to solve for. For the Tire field, enter your tire diameter in inches. If you know your gear ratio then this doubles as a ..., 4. Input the center distance between the pinion and the gear. 5. If needed, also input the gear cutting tool's tip rounding radius coefficient. 6. Input the number of teeth of the pinion and the gear. 7. Enter the precision grades of the two gears as well as absence or existence of tooth form correction (s). 8., Fixed gear bikes are commonly sold with a 46 tooth chainring and 16 tooth sprocket giving a gear ratio of 46:16. Fast enough on the flats, but not too hard on the hills. It’s equivalent to 52:18, which might be the larger chainring and 4th position sprocket on a multi-speed bike. This is a simplified explanation and the exact details vary ..., 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. - Gear Ratios. BikeCalc offers a wide range of gear sizes for BMX, CX, MTB, road bikes, track bikes, fixies, recumbents and many more., Dec 13, 2023 · Here is a list of the top five fixed-gear bike gearing options for hills, ranked by their difficulty: 23/19 Best fixed gear ratio for hills. 22-11 Best fixed gear ratio for steep hills. 21-13 Best fixed gear ratio for hilly terrain. 20-15 Best fixed gear ratio for very hilly terrain. 19-17 Best fixed gear ratio for seriously hilly. , BikeCalc. One gearing. to rule them all. 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. Gear Ratios., Cycling is a great way to stay active and explore the outdoors. However, with so many different types of bikes available, it can be difficult to know which one is right for you. Tw..., Use our house flipping calculator to determine the total spend, return on investment, and profits of your fix-and-flip project. Real Estate | Calculators REVIEWED BY: Tricia Tetrea..., The gold-silver ratio is measure of how many ounces of silver it takes to buy an ounce of gold. The gold-silver ratio is measure of how many ounces of silver it takes to buy an oun..., Jun 21, 2018 ... Gear to help you whip out skidz: https://kit.com/ZachGallardo/guide-to-skidding-on-a-fixed-gear Get exclusive behind the scenes access by ..., Calculating ratios by using the instantaneous planet gear velocities. This method analyses the motion of one planet gear. The centre moves at the same velocity as the carrier , the pitch velocity at the teeth mating with ring is the same as that of the pitch velocity of the ring and the pitch velocity of the teeth in contact with the sun gear moves at the same …, An annuity can be defined as a series of fixed payments made to a recipient at equal intervals. Some examples of annuities include interest received from fixed deposits in banks, p..., 48/17 is a nice intermediate ratio. I'd recommend starting with something like 45 or 46/17 if you're new to riding fixed, though - especially if you've got hills around. Reply reply. batkobatko. •. I won't be riding hills, I'm building a commuter and it's all straight road. Thanks for the recommendation mate!, The reserve ratio is the percentage of deposits that the Federal Reserve requires a bank to keep on hand at a Federal Reserve bank. The reserve ratio is the percentage of deposits ..., Fixed Gear Ratio Calculator. Calculateur de ratio. Vous roulez sur un vélo mono-vitesse que ce soit en pignon fixe ou en single speed, l’étude de votre ratio est utile afin …, To use this online calculator for Gear Ratio given Number of Teeth, enter Number of Teeth on Spur Gear (z) & Number of Teeth on Pinion (zp) and hit the calculate button. Here is how the Gear Ratio given Number of Teeth calculation can be explained with given input values -> 2.5 = 30/12., 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 ..., 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., We can use one of many calculators available on the internet to calculate this value and analyze the ratio and cadence., 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 ..., 2. Break down the event/discipline and work out which energy system you will mostly be utilising and what’s achievable in terms of an average cadence over the total time of the event. 3. For shorter, more sprint type events, run a few trials on different gear ratio’s to work out your maximum power output and drop off over 30 seconds. 4., The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1., Le "Fantastic Fixed Gear Calculator" vous est gentillement offert par l'équide de SURPLACE, ouai ouai on est sympa. Toutes les données relatives aux circonférences de pneu proviennent du fantastique site de Sheldon Brown. Merci à lajalousie pour les corrections apportées au calcul des skid patchs ambidextres, Calculate Ratio: Instantaneous computation of the gear ratio, achieved by dividing the number of teeth on the driven gear by those on the driving gear. Display Output: The calculated gear ratio is presented numerically, typically in decimal form or as a simplified fraction., 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., 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 - 1,9 < ratio < 2,3 : lot of steep slopes - 2,3 < ratio < 2,7 : polyvalent ratio - ratio > 2,7 : high speed on flat roads (take care of your knees)