Originally Posted by
jhaddad8
I got this old Trek frame recently and want to build it up fixed, it has horizonatol drop outs but they are a little on the short side. The dropouts are ~20 mm long. Is this long enough? Or should I use an eccentric hub?
If an axle is 10mm in diameter then you have 10mms of room for adjustment. 5 in front and 5 in back theoretically.
5mm is ~.2 inch. For every tooth added to, or subtracted from the drive train, you need to move the axle 1/8th inch, or 3.175mm. So you should be able to dial it in without an eccentric hub or bottom bracket.