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14t as smallest cog for 8 speed?(6 posts)

14t as smallest cog for 8 speed?off roadie
Sep 1, 2002 8:40 PM
I ripped appart my 8 speed road caseette and my 9 speed LX to mix and match. I want to rebuild the road cassette as a 24-14 (24/21/19-14). Ive got all the needed cogs, but I'm not sure I can just pop a loose 14t cog on the small end of the stack. First, its got ramps for downshifting and no knurnling- not a dealbreaker, I'd guess, but enough to make me think. What it made me think was the freehub design seems to require a "unitized" small cog / spacer combo, because the splines don't go all the way to the end.

I see Harris sells 9 speed cassettes with a 14t small, but not 8 speed. Is there no such thing as a 14t small for 8 speed? Any way I can imrpovise, or do I have to forsake the "pinecone" and get a 13t small cog?
re: 14t as smallest cog for 8 speed?kcd
Sep 2, 2002 12:11 AM
I have a spare 14t uniglide 1st cog (threaded type) but you are probably looking for a hyperglide one.
re: since 7 and 8 have the same spacingcyclopathic
Sep 2, 2002 3:52 AM
your best bet is to get 7sp cass. Shimano made HG 7sp cass in 14x32 size (Code F).

You may try to hunt for used cass at LBS they might have something at treshcan or new never sold. The best bet probably would be to call Sheldon Brown at Harris or to try Loose Screws good luck
re: Not reallyRusty Coggs
Sep 2, 2002 4:45 AM
Shimano 7 speed C-C cog spacing is 5.0mm and 8 speed is 4.8mm. Close,but not the same
re: Not reallycyclopathic
Sep 2, 2002 6:17 AM
correct.

It will work, .2mm does not cause any shifting problems. when 8sp came out 7sp cass were used with 8sp shifters + spacer.

Since it is only one last cog even 9sp (4.34mm vs 4.8mm) would not cause any problems, given he runs 9sp chain.
re: Not reallyeddie m
Sep 2, 2002 11:25 AM
I've run all sorts of different mismatched combinations, and I could get all of them to shift well across a range of 3 or 4 cogs. One mis-spaced cog shouldn't cause much trouble, but if it does you could always mill the shoulder of the cog a little, or make a shim if it's too narrow.