Mountain bike sizing ?

Hello all,

I have a mountain bike which I have owned for about 18 years, the frame size is 21 or 22" as generally they were sized the same way as a road bike but frame sizes tend to be a lot smaller now with a long seat tube so I wondered what size MTB would be the equivalent now days ?


Ride It Like You Stole It!
South Manchester
Depends on your frame - my nearly 30 year old MTB is a 17", road bikes 22". New MTB is a similar size. How tall are you.


Legendary Member
Accra, Ghana
21 or 22“ would qualify as large, and would still do today. Sizing is not the same as road bikes due to the usually higher BB.
Sizing is very much a personal choice and also depending on the discipline. Most would probably go smaller rather than larger for better comfort on rough terrain.
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