Bike Wheel Size Mm. Wheels with an iso diameter of 584 mm were originally known as 650b and were first introduced on french touring bikes in the 1960s. Being slightly smaller than modern road bike wheels their use persisted on small and extra small road frames that couldn t accommodate a 700c wheel.
The section height of a tire is usually identical to its section width for tires less than 28 mm 2 5 mm have to be added to the width to get the height. 26in 650b and 29in explained. If you are reluctant to get on your bike and your old bike seems uncomfortable measure the frame height and compare it with your body size.
Here they are in a table to make them a little easier to comprehend.
Add a 2 3 tyre onto this and you have a wheel that stands 740mm tall at the tread and rolls over trails obstacles more easily than any of the smaller wheels. 26in 650b and 29in explained. Some downhill frames may have 150mm rear spacing. On road bikes and hybrids no as these bikes will all have a similarly sized wheel.