# Frequent question: How do you find the gear ratio on a bicycle?

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## How do I know my bike gear ratio?

Gear Ratio is the ratio of revolutions of the cranks to revolutions of the rear wheel.

1. Gear Ratio = Number of Teeth in Chain Ring ÷ Number of Teeth in Rear Cog.
2. Gear Inches = Diameter of Rear Wheel x (Number of Teeth in Chain Ring ÷ Number of Teeth in Rear Cog)

9 окт. 2017 г.

## What do the numbers mean on bike gears?

Bikes generally have 1, 3, 18, 21, 24, or 27 speeds. (10- and 15-speeds are obsolete and you don’t see them on new bikes anymore.) Lower numbers are the low gears, and higher numbers are the high gears. … Downshifting means going to a lower gear, and upshifting means going to a higher gear.

## What is the best gear ratio for cycling?

High Gear Ratios

At a cadence of 90 rpm (which is very comfortable and most people can handle significantly more), a 50-tooth chainring and a 12-tooth cog gives a speed of 47 km/h. 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.

## How do I know if my bike is 10 or 11 speed?

Multiply the front gear number by the rear gear number to get the number of speeds. For example, if you have two front gears and five back gears, you have a 10-speed bike. If you have one front gear and three back gears, you have a 3-speed bike.

## What gear is best for going uphill on a bike?

Low Gear = Easy = Good for Climbing: The “low” gear on your bike is the smallest chain ring in the front and the largest cog on your cassette (rear gears). In this position, the pedaling will be the easiest and you’ll be able to pedal uphill with the smallest amount of resistance.

## What gear ratios do professional cyclists use?

Pros often use a 55×11-tooth high gear for time trials. On flat or rolling stages they might have 53/39T chainrings with an 11-21T cassette. In moderate mountains they switch to a large cog of 23T or 25T.

## Is biking good for your butt?

Although you use your glutes to sit on your bike, cycling—depending on where and how you ride—doesn’t always build these important muscles. … “Typical cycling challenges the thighs—the quads and the hamstrings—but not really the gluteals,” he says. There are exceptions. “Sprinters use the glutes for acceleration.

## What is the easiest gear on a bike?

The easiest (lowest) gear is when the chain is on the smallest ring in the front and the largest cog in the rear. The rest of the gears range between those two extremes. The bigger chainring is HARDER to pedal and the smaller chainring is EASIER to pedal.

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## Is 7 gears enough on a bike?

If you ride on flat ground or with little slopes, or if you do not care about achieving high speed on flat, go for the 7 speed. But if you want to overcome steep climbs and also have good speed on the flats, then you may need a bike with more gear ratios.

## What gear should I bike in on flat road?

High Gear. This one is great for descending, accelerating, or for use when you want to go nice and fast on a flat road. In a high gear, you travel a long way for each turn of the pedal.

## Which gear ratio is better for gas mileage?

Automakers Offer Variety of Axle Ratios

Step one in understanding axle ratios is to know what the numbers signify. The lower the number, the better fuel economy, and the higher the number the more towing power you have, but fuel economy suffers. For instance, a 3:31 gets better fuel economy than a 3:73.

## Why are BMX sprockets so small?

Many BMX bikes use a U-style rear brake mounted to the top of the frame chain stay. With this style of brake mount, a very small sprocket and rear cog will lower the chain so much it contacts the top of the brake and inhibits pedaling. Typically the smallest gear combination a bike of this style will allow is a 36/13.

## What does 10 speed mean on a bike?

A 10-speed bike is a type of road bicycle that allows you to change the pedaling resistance through a shifting mechanism. The various gears provide up to 10 different resistance settings, or speeds. This type of bicycle engineering makes riding on hilly terrain over long distances easier.

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## What is a 3 32 chain?

3/32″ (0.094″, 2.30 mm) chain is used on derailer equipped bicycles that have more than 3 cogs at the rear. Even somewhat narrower chain, typically . 090″ or 2.29 mm between the inner plates, is used for derailer-equipped bicycles with 9 or more sprockets at the rear.

## What makes a bike fast?

Real racing bikes are fast because they use supple high-performance tires. Their frames flex just the right amount for a powerful rider. Racing bikes are fast because the rider has little wind resistance thanks to the low riding position, narrow handlebars, and tight-fitting clothing.