Bicycle Mechanics - switching cassettes

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Pharmr
08-25-08, 11:46 AM
I'm switching cassettes and want to know if I will need to adjust chain length...

switching from a Ultegra 12-23 to a 105 12-27....other than a possible RD barrel adjustment will my current chain be okay with the switch??

thanks

ettsn
08-25-08, 12:50 PM
Impossible to say without looking at it on the bike. In your big ring/big cog now, how much cage movement is left in your RD?
caloso
08-25-08, 12:52 PM
B-screw perhaps.

http://www.sheldonbrown.com/derailer-adjustment.html#btension

G piny parnas
08-25-08, 05:24 PM
always check your chain stretch--- old chain?- new chain? and do you know how to check the proper length on any given chain on any given bike?---- I'm sure that's been discussed on bf---
Bill Kapaun
08-25-08, 05:42 PM
Since one is 9 speed and the other is 10 speed....
EDIT- I jumped too soon again:)

IF the chain was properly sized for the 23, you'll need to add a link set. Inner & outer link.
Going the other way, no problem, although technically, you would remove one link set. I probably wouldn't, just in case I wanted to switch back.