How Are Bike Wheel Sizes Measured

Bicycle frame sizes and tire sizes differ but neither of these apply when talking about whether a bicycle is 16 inches 24 inches 26 inches 27 inches or 700 millimetres.

How are bike wheel sizes measured. Kids bike sizing in kids bikes are measured in inches. Take your tape measure and place it on flat surface across the tire s tread going from one side to the other side. In most cases riders usually go with whatever bike tire that will come along or leave the task to the local bike shop when it s time to replace or upgrade a tire. Kids bikes without pedals are called run bikes and have wheels that measure from 8 to 12.

Wheel size d this is the outer diameter of the wheel with the tire installed on the rim. The wheel size for a mountain bike or any other type of bike is a combined total of the rim diameter and the. Mountains bikes now come in three different wheel sizes. Measuring width is just as easy.

If all three have a 15 frame there will be a height difference between them due to their wheel size. These designations can be confusing but one wonders how a manufacturer determines what to call a push bike s rim size. If the sizes of wheels are changed the odometer or speedometer will give a wrong reading. To measure a bicycle wheel start by standing the bike upright by leaning it against a wall or using the kickstand.

Then use a tape measure to measure the distance from the ground underneath the tire to the center of the wheel to get the radius. While the second the rim s diameter measured at the lowest point of its braking surface. The sizes you commonly see for mountain bike wheels like 26in 27 5in and 29in all refer to the outside diameter of the wheel with the tire fully inflated. Standard bike tire sizes place the diameter first and the width second.

Measure the distance or circumstance around the outer part of the bicycle wheel to calibrate odometer or speedometer of a bicycle gps and computer. While it s a very simple measurement to make people often misrepresent the wheel size for their bicycle because they re measuring the wrong thing. Now all that s left to do is to combine the measurements. These sizes can be thought of as a sort of shorthand for decimal sizes each with a corresponding iso measurement.

Therefore a 20 622 tire is a tire 20mm wide that fits on a rim with 622mm in diameter typically a road bike rim or a 29er one. How to measure a mountain bike wheel in inches. Bike frames are measured from the middle of their bottom bracket to the end of their seat tube. You can find them with 26 wheels 27 5 wheels or 29 wheels.

Next multiple the radius by 2 to get the diameter.