Shimano cassette sprocket

nitrogen · 19-08-2011 3:20pm #1

I recently bought a 12-25 Ultegra cassette, but instead of changing it (Unopened & too lazy to post back), I just want to change the 12 for an 11 (Or take out a 16/17).

Are they sold separately, because I can't see them listed on Wiggle/CRC? Or am I best return it?

Thanks

Hermy · 19-08-2011 3:27pm

Harris Cyclery was the only place I ever came across that sold them seperately but I don't think they do this anymore.

Home:Ballyhoura · 19-08-2011 3:40pm

Local bike shops should have lots off sprockets lying around if you check with them, shouldn't be too hard to get one off them.

nitrogen · 19-08-2011 3:53pm

Home:Ballyhoura wrote: »

Local bike shops should have lots off sprockets lying around if you check with them, shouldn't be too hard to get one off them.

Ah yes, I forget about those places that also sell bike related stuff.

Paul Kiernan · 19-08-2011 4:09pm

I don't think it's that simple. The cassettes with an 11 cog usually need a 1mm spacer fitted and they have an extra plastic spacer as compared with a 12 cog (4 instead of 3, I think). You'd need to check out the Shimano technical docs on the web!

blorg · 19-08-2011 4:47pm

It is not that simple, change the cassette. If you just swap the smallest cog you will go 11-13-14 while a proper 11T will go 11-12-13-14. Close cogs are more important at the small end.

Also: you don't need an 11T.

ratracer · 25-08-2011 4:10pm

nitrogen wrote: »

I recently bought a 12-25 Ultegra cassette, but instead of changing it (Unopened & too lazy to post back), I just want to change the 12 for an 11 (Or take out a 16/17).

Are they sold separately, because I can't see them listed on Wiggle/CRC? Or am I best return it?

Thanks

What did you do with the cassette in the end?

Shimano cassette sprocket

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