Bicycle Mechanics - univega tires/tubes?

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dandelion91

10-18-11, 03:13 PM

I recently just got another bike; a univega grantech aluminum. Im currently shopping for new tires and tubes for the bike, but being fairly new to the biking scene, im a bit confused on what size tubes i should get. My tires are supposed to be 700 x 23c, but when i went to the store they offered a 40mm valve and a 52mm valve. Im not sure which one im supposed to get... ANY HELP APPRECIATED! :D

johnny99

10-18-11, 03:56 PM

Longer valve stems are for aero rims, which you probably do not have.

JanMM

10-18-11, 04:45 PM

You could take one of the original tubes to the store.

HillRider

10-18-11, 07:27 PM

Valve stems are made in various lengths to fit rims with different sections. Shallow "box section" rims use a shorter stem than "deep section" aero rims. Unbless you have aero rims, the shorter stem will be the better one.