Road Bike Gear Ratios Explained

Common gear ratios are 39t or 42t for the inner ring and 52t or 53t for the outer. Depending on the type and age of your bike it will probably have between 9 and 12 sprockets and will be referred to as 8 speed or 12 speed respectively. At a 60 rpm pedaling rate the speed of the bike is 18 5 mph 30 kph.

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Welcome to our site! Here we have a plenty of road bike gear ratios explained for you as your basic idea in your next Action! Feel free to download the image and use it as your guideline. However, the free road bike gear ratios explained images provided below is not given in a detailed manner.

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To get our gear ratio we divide the number of teeth on the front by the number on the back.

Road bike gear ratios explained. Two chainrings at the front paired with up to 11 sprockets at the rear. Gear ratio is usually expressed in gear inches i e. Gear ratios for these gears. The gear ratio combined with the circumference of your wheel and tyre determines how far you will travel with each revolution of the cranks.

If the left shifter is at 3 and the right is at 8 then you are in the hardest gear on the bike. That creates a 4 to 1 gear ratio. If we have a chainring with 30 teeth and a sprocket with 30 teeth there is no difference between the two. The number 1 corresponds to the little ring 2 is the middle ring and 3 is the big ring.

For the front chainrings bigger chainrings equal a harder gear. If your gears are too low or in other words too easy you might be left behind as you spin out. The distance in inches covered by the rear wheel for one full turn of the pedals roughly speaking for a detailed explanation click on the link from at the beginning of this sentence. On a typical road bike the smallest sprocket will typically have 11 11t or 12 12t teeth and the largest 25 25t to 32 32t teeth.

50 11 4 55. With 26 inch wheels the bike moves forward 326 inches with each pedal stroke. In simple terms a gear ratio on a bike refers to how many times the back wheel will rotate for each full turn of the crank arms pedals. With all of the options available to today s road cyclists it is possible to produce gear ratios that are as small as 1 0 and as large as 5 0 with increments of 0 15 0 40.

The gearing you have on your road bike is one of the most important things to get right if you are to maximise the enjoyment of your riding and has a significant impact on how fast and far you re able to ride. On the left shifter you will see numbers to indicate which gear you are in 1 2 or 3. One full revolution of the pedals will result in one full revolution of the wheel. By doubling the pedaling rate to 120 rpm the bike has a maximum speed of 37 mph 60 kph.

Let s say i am in the hardest gear on each which means i would be riding on the 50 tooth ring on the front and the 11 tooth ring on the back.