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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 06-08-09, 09:03 AM   #1
sickz
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cog tooth count interchangeability

unsure how to word the topic.... but my question is..

how much distance in the dropouts does the rear axle move when adding or subtracting a tooth?

a ratio would be nice... somethin like 2 teeth : 1 cm

anyone know ?
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Old 06-08-09, 09:28 AM   #2
twelsch42
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One tooth equals about 1/8" change in the dropouts. Don't take my word for this just yet. Others will confirm or correct.

edit: After checking my dropouts paint scrapes I can say confidently that going from 15 to 17 moved my axle about 1/8"

Last edited by twelsch42; 06-08-09 at 09:42 AM.
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Old 06-08-09, 09:36 AM   #3
Aries
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Id say your ratio is roughly accurate, OP. I switched from 17t to 16t a couple months back and I noticed the tire slide ~5mm forward when I adjusted the chain tension.
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Old 06-08-09, 09:58 AM   #4
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Sheldon sez:

"Note that for each tooth difference, the axle position in the fork end will change by 1/8" (3 mm.)"
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Old 06-08-09, 10:36 AM   #5
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see sheldon.
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