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Old 04-01-12, 03:42 PM   #1
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10 speed cassette question

i recently changed over to a compact crank, 50/34, from a triple, 52/42/30.
i have a 10 speed rear cassette 12-27. all of the drive train consists of 105 components. i do most of my riding in the 16-17-19 gears on the rear cassette. i use the 12-13 gears almost never.
it would be nice to have a 18tooth gear between the 17-19. i figure remove the 13 gear and replace it with a 18.
can you buy just a 18 tooth gear? or will i have to buy a complete cassette with a 18 in it?
in my research the only way to get a 18 in a 10 speed cassette is with ultegra or dura ace. they are both expensive. i would assume i could find a 18 tooth gear in a 9 speed and save a few bucks. i would assume the gear thickness between a 9 and 10 would be the same. the spacers between the gears would be different. an i wrong on this assumption?
i would remove the 13 instead of the 12 because the 12 is designed to mate with the lock ring. do they make a 13 lock ring gear?
i am probably sure if i switched to the 34 ring in the front i could find similar gears but switching rings and rear gears gets complicated and i would assume would lead to cross chaining.

your input would be appreciated on solving this problem.
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Old 04-01-12, 03:56 PM   #2
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Old 04-01-12, 04:07 PM   #3
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Shimano synchronizes the shift ramps on Hyperglide cog sets so the chain can engage two cogs at a time when using cogs made to work as neighbors. But if you mix & match cogs from different cog groups, don't expect the shifting to be 100% "Hyperglide smooth" when downshifting from the 17 to the 18, or from the 18 to the 19.
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Old 04-02-12, 07:50 AM   #4
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The shifting at the bottom of that cassette will be pretty dicey and a HUGE jump. I'd look for a 13 tooth bottom cog, ditch the 12 and put the 18 in. You'll also need an additional spacer, methinks.

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