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# How do you calculate the gear ratio on a bike?

Updated: 9/27/2023

Wiki User

13y ago

Divide the number of teeth on the pedal gear by the number of teeth on the wheel gear. If you have multiple gears to choose from, you then have multiple ratios.

If you are talking about a motorcycle, the same principle applies, but now you have more than one set of gears: the crank to countershaft primary set, the selected gear set, and the mainshaft to wheel set (if chain), or the two sets (mainshaft to shaftdrive and shaftdrive to wheel, if shaft drive). You need to multiply the ratios that are in series at any one moment of time to get the overall gear ratio from crank to wheel.

Wiki User

13y ago

Wiki User

7y ago

Multiply the number of gears on the crank with the number of gears on the rear axle. This will tell you how many gears there are, but if you calculate the actual gear ratios you'll often find that there are usually several duplicates. Generally speaking, a 27-speed setup will "only" give you something like 15-18 distinctly separate gear ratios.

Wiki User

14y ago

Just fine, thank you for asking. The gears on a bike work just like any other set of gears, they allow you to trade power for travel - or the other way around. If spinning the pedals is too easy and you can't crank them round any faster, then a change of gears will make the rear wheel turn more WRT the pedals than before, bringing more resistance to the pedals and more speed to the bike. If turning the pedals is too heavy, then dropping a gear will make the pedals easier to turn on the cost of the rear wheel spinning a bit less for each turn of the pedals

Wiki User

11y ago

Bicycle gears do the same as gears do everywhere - they allow you to trade strength for speed, or speed for strength.

By letting the rear wheel turn at a different and adjustable ratio than the pedals, the rider can work at the same level of effort regardless of if he's heading up hill or downhill.

Wiki User

17y ago

Count the number of teeth on the front and back chainwheel for a given gear combination on your shifters, and divide.

Wiki User

10y ago

Basically you take the number of teeth up front and divide by the number of teeth on the rear. BMX gear ratio is usually around 2.75, but but some riders want something else.

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Related questions

### How do you do a wheeler on a gear bike?

Pick a gear that gives you the right ratio, then go for it. No difference than from a single-speed bike.

### How do you calculate a gear ratio of a 9 tooth Drive gear?

Number of teeth on driven gear divided by teeth on driven gear.

huh?

### How do you calculate rpm of a wind turbine?

You can calculate the rotation speed (rpm) of a wind turbine by dividing the rotational speed of the generator (usually given in revolutions per minute, or rpm) by the gear ratio of the turbine. The gear ratio is the ratio of the number of teeth on the turbine's gear to the number of teeth on the generator's gear. This formula allows you to determine the turbine's rpm based on the generator's rpm and the gear ratio.

### What is the formula to calculate gear ratio?

Number of teeth on driven gear divided by teeth on driven gear. Example: 40 teeth on a ring gear and 10 teeth on a pinion will be a 4.00:1 ratio.

### What is the formula to calculate the ratio?

Number of teeth on driven gear divided by teeth on driven gear. Example: 40 teeth on a ring gear and 10 teeth on a pinion will be a 4.00:1 ratio.

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### How do you calculate a gear ratio of a 5 tooth drive gear and a 15 tooth driven gear?

You take driven divided by drive. 15 divided by 5 is 3. So the ratio would be 3:1

### What is the gear ratio for Honda's CRF230F?

The gear ratio for the different gears of this bike is: 1 gear 2.769 (36/13) 2 gear 1.941 (33/17) 3 gear 1.450 (29/20) 4 gear 1.148 (31/27) 5 gear 0.960 (24/25), 6 gear0.812 (26/32).

### How gear ratio of a crown and pinions are calculate?

count the teeth on each, just as with any other gears.

### Why is gear ratio also called velocity ratio?

The gear ratio of a train, also known as its speed ratio, is the ratio of the angular velocity of the input gear to the velocity of the output gear. The gear ratio is very important when it comes to physics.

### What does p0731 mean on a Chrysler 300?

Incorrect gear ratio in first gear.Incorrect gear ratio in first gear.