If you are talking about mountain bikes then 20" refers to the frame size. frames are usually measured from the center of the bottom bracket to the top or the seatpost tube. a 20" mtb would usually be considered a large.
bmx bikes are often referred to as 20" bikes because their wheels are 20" in diameter.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Mountain Bike Reviews Forum
15.4M posts
515.6K members
Since 1990
A forum community dedicated to Mountain Bike owners and enthusiasts. Come join the discussion about bike parts, components, deals, performance, modifications, classifieds, trails, troubleshooting, maintenance, and more!