Join Date: Apr 2006
Location: Gainesville/Tampa, FL
Bikes: Trek 1000, two mtbs and working on a fixie for commuting.
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Yea, they are definitely different though it will probably work in your applications. Think of like why the give you multiple Phillips screwdrivers in a set. The above would be a nightmare.
I suppose you can do math. Your circumference is 8.5 cm and you are looking for the diameter. The formula is 2(pi)r = C. 8.5/3.141592 = 2.705. So, that would mean you need something 27.05mm.
Now, besides revisiting middle school math, sometimes the size is stamped on the inside of the tube that is your handlebar on the edge.