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cassette top cog

Old 02-04-10, 05:46 AM
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cassette top cog

i am replacing the 11t top cog on my 8 spd with a 13t. the fastest i have pulled in my area is 28 mph for a short distance, so i am curious if a 14t top cog from a 7 spd would shift ok on my 8 spd. i ask because i can not find a 14t 8 spd top cog listed for a shimano cassette.
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Old 02-04-10, 06:06 AM
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I've done this with friction with no problems, but never tried with indexing. I would imagine the closeness in thickness would make no difference with modern indexing systems....especially if you use an 8 speed spacer in front of it.

I'd try it and see.
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Old 02-04-10, 06:57 AM
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on the top cog the spacer is built in and the splines are sightly different from the others, so a top cog must be replaced by a top cog only. at least that is my understanding from reading not experience.
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Old 02-04-10, 08:21 AM
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It will work because it is the first cog in the set.
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Old 02-04-10, 08:59 AM
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super, now to find out how the 13t works and search ebay for a 14t.
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Old 02-04-10, 09:41 AM
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What's the second cog on your cassette. If the top was an 11, I would think that the second would be a 12 or 13. Seems you will have a redundant cog there, unless you're doing more cog mixing than you've mentioned.
The few 8 speeds I've looked at on-line are 11-13-......
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Old 02-04-10, 10:23 AM
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i picked up an 8 speed 13-26 on ebay that i am using to mix some cogs in with my 11-32 to avoid duplicate cogs, to make a 13-32

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Old 02-04-10, 10:55 AM
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There is a 14t top for 9 speed, I've used an 11t top and 12t second 9sp on an 8sp without issues.
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Old 02-04-10, 11:54 AM
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It's easy to grind the built in spacer down to the correct thickness on the side of a bench grinder. I made a 9-speed 13 that way. The steel is too hard to file.

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Old 02-04-10, 01:17 PM
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My bad, you're 100% right.

I actually have a little tiny spacer before the cassette on mine - so the spacing would probably be an issue. I forgot about that little guy.
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