|   Quiz for duck-How far does your rear axle move.......... | scarecrow
Apr 17, 2002 9:29 AM | | in the dropout when you go up or down a tooth on the cog? I'm trying to figure out what track cogs will work on the fixie I'm setting up. I want a couple of choices because the hub is a flip/flop, but the dropouts are the old roadbike semi-horizontal type. So, with that limited adjustment room, can I do a 16/18? |
| 1/8".... | Monte
Apr 17, 2002 6:08 PM | | Looks like about 1/8" for a one tooth change for the cog. FixMeUp
Monte |
| I have semi-horizontals | Ginz
Apr 17, 2002 7:47 PM | | ...and I can't get one-tooth adjustibility. Changing the combo usually means adding or subtracting a link from the chain and jumping two teeth. Remember that te dropout angled. So, the effective chainstay length might change by 1/8", but that means far more movement in the dropout. A little trigonometry would figure that out. |
| my vertical dropout flip flop solution | Seb
Apr 18, 2002 5:41 AM | | The way I managed my flip-flop with vertical dropouts was to have 2 chainrings up front, which seperately match chainlength and chainline with the rear. The inboard is 36t, and runs with the 16t track cog on the back. The outboard is 34t, and runs with the 18t freewheel I've got on the other side. The two combos have the same chain and stay length (or good enough), and the teeth on the freewheel ride at least 3mm further outboard than the track cog, so the chainline(s) work out fine.
I had to file my droputs maybe 2mm to get good chain tension, but a semi-horizontal should avoid that, if you find the right combos. |
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