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Shimano Sora 8 speed double derailer(4 posts)

Shimano Sora 8 speed double derailerChris R
Oct 18, 2001 1:15 PM
I recently changed my rear cassette from a 13/23 to a 13/26.
I have found however that the top cog of the derailer comes in contact with the teeth of the cassette.
I have tried adjusting the "B" screw but even at its maximum setting there is still contact with the derailer cog and the cassette cog.
Can anyone suggest a solution?
re: Shimano Sora 8 speed double derailernee Spoke Wrench
Oct 18, 2001 4:39 PM
Did you lengthen your chain when you installed the larger cassette?
re: Shimano Sora 8 speed double derailerChris R
Oct 19, 2001 2:37 PM
Dear nee Spoke Wrench
Thanks for your help.
No I didn't lengthen the chain but it was one option that I considered.
Would this solve my problem?
Try itnee Spoke Wrench
Oct 21, 2001 5:21 AM
It might let the derailleur rock back a little farther.

Shimano says the Sora deraileur will handle a 27 tooth large cog and I think they are usually right about stuff like that.

Several responders on this board say they have exceeded Shimano's recommendations regarding large cog capacity, but I don't know that I believe them because it's never worked for me.

I have cheated on the slack take up, but I always make sure the chain is long enough to cover the big/big combination. If the chain goes slack in the little/little combination, I don't care.