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11/23 to 12/25 cassette change(5 posts)

11/23 to 12/25 cassette changetmac13
Jun 17, 2003 11:14 AM
I'll be doing this on an Ultegra Triple. What, if any, changes do I need to make to the rear derailler?
Not much of a change...I'm guessing it will work as is.retro
Jun 17, 2003 11:41 AM
Don't have the specs at hand, but that's a pretty minor change. I can't imagine 25 would exceed the capacity of the derailleur. If I'm wrong, I'm sure somebody will let us know.
You'll probably have to adjust the "B" screw...almccm
Jun 17, 2003 12:10 PM
and maybe cable tension. See Sheldon Brown's writeup on adjusting derailers.
You'll probably have to adjust the "B" screw...Triphop
Jun 17, 2003 2:02 PM
Just did this myself last weekend, except on a double. All I had to do was adjust the b screw.
probably no changesDougSloan
Jun 17, 2003 1:17 PM
Unless the B limit screw is set to place the upper pulley right on the 23 cog now, you won't have to do anything.

The one thing I'd check is chain tension in your bigxbig combo; slowly shift into the 25 while in your big ring. If the pulleys on the derailleur straighten out too much or it binds up at all, you may want to lengthen the chain.