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Cassette Replacement Advice(3 posts)

Cassette Replacement AdviceWheat
Mar 30, 2003 10:46 AM
Have 12x23 nine speed Dura Ace. Would like to have an additional 12x27 cassette for the hills. Question will this swap be "painless" or is major adjustment to the derailleur required. Thanks in advance....
Painless.Spoke Wrench
Mar 30, 2003 12:13 PM
I'd advise checking your chain length to be sure it will be long enough to cover the big/big combination (even though you don't use it). Actually, I think that it's good practice to get a new chain any time you install a brand new cassette anyway. Your derailleur may require a minor B-screw adjustment, but even that usually isn't necessary.
re: Cassette Replacement Advicepmf1
Apr 1, 2003 12:45 PM
Its very easy -- I do it all the time. The whole process takes a few minutes. You can go from a 12-21 to a 12-27 without any monkeying with your chain or derailer.

Get a chain whip and a cassette removal tool (or cog, or whatever its called). I find that holding the removal tool with a pair of vice grips works really well. When putting the new cassette on, make sure all the cogs are in order and that the writing (numbers) on the cogs faces away from the bike. They have a particular way that they go on which will be obvious. There is no need to really crank the cassette on when tightening it. That makes it harder to get off later on.

If you aren't going to use this much, you might want to consider an Ultegra cassette. Its a little heavier, but it lasts longer and is about half the price.