Mountain Bike Rim Sizes

These sizes can be thought of as a sort of shorthand for decimal sizes each with a corresponding iso measurement.

Mountain bike rim sizes. Below we prepared a tabel with rim sizes of 4 different bicycle types and their equivalents in inch etrto and french standards. Just as the 650b wheel was adopted by mountain bikers and became 27 5 the 700c wheel has taken the mountain bike world by storm in recent years and become known as 29. The rim diameter size is measured differently with etrto for example. So the a standard road bike rim is likely to have markings of 622 x 19 some small sized road bikes for short legged adults or juniors are made with 650c wheels and have an iso measurement of 571mm.

Like the 700c 622mm rims they will have a rim width number attached. New wider lighter rim designs with wider boost hub spacings 110mm f 148mm r builds a stronger stiffer and more supportive wheel. Mountain bikes rim sizes. These widely used measurements refer to the tire s diameter and are typically paired with a tire width in inches when written out i e.

The traditional sizing method shown above and etrto sizing which lists the tyre width first and the rim diameter second. However it was brought up with the arrival of the 27 5 inch mountain bike which used b width rims. The venerable sheldon brown has a gear calculator that uses a different method to determine wheel size. 27 5 also know as 650b or 29 called 29ers with traditional 26 wheels reserved for dirt jump freeride and kids bikes.

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. With the explosion of boost plus bikes mid fat and other portly new rim and tire sizes for everything from road to cyclocross to gravel to mountain bikes it s a wonder there isn t more confusion as to what will actually work together. His calculator uses an pre defined diameter for every rim tire combination and his diameters are almost always different than what the math would predict. 29 x 2 0 27 5 x 2 4 29 x 2 8.

Most mountain bikes today are offered in one of two wheel sizes. All the advantages of a larger wheel mentioned above are pushed to the limit on a 29 or 29er mountain bike although some riders feel the sacrifice in maneuverability and turn radius are not worth it. Whether you are mountain biking on dry trails in utah or through the waterfalls of iceland having the right tires is crucial for the best riding experience. A standard 700c road bike rim with a 23mm tyre width which is the same size as 700 x 23c.

Tips regarding bicycle tire and rim sizes. Sometimes the sizing info is listed in two different ways. And by work together we don t just mean whether or not it ll mount.