I have an indexing problem with my Campag Chorus 11 Speed cassette. All the indexing works fine, apart from the 8th cog which is skipped shifting up and down.
Does anyone have any ideas what could be causing this?
Cheers
Sam
Slightly bent mech hanger would be my first thought.
Slightly bent mech hanger would be my first thought.
Opps, beaten to it.
Have you got the spacers in the right order?
Is one of the cogs the wrong way round? Do you have a kink in the inner cable?
Missing spacer?
Bent mech hanger is possible but it usually results in perfect shifting at one end of the cassette and not the other, it’s unusual to be just one gear. If your shifters are older it may be a bit of wear in the mechanism and commonly in the most widely used gears. I have had one occasion that this seems to have been the case with a campag shifter, I changed the cables, aligned the hanger fitted a new chain and cassette and still could not get two gears to index properly.
Check out the cable pull through each gear by hand, if the mechanism for 8th click is damaged or worn you might feel a shorter or longer release of cable than the adjacent gears?
Of course it could just be the mech hanger and that’s an easy fix with the right tool.
Is there a kink in the cable that snags at the point of 8th gear?
Is the outer a smooth curve?
I did find my Chorus 11 extremely sensitive to set up. And temperature. To the extent that a perfectly shifting bike at 6:30am in the Dolomites had turned into a not very well shifting bike by midday in the heat of the day.
I've ended up going to eTap on my best bike. Still have old Record 10 and Chorus 10 on my cx bikes though. To me Chorus 10 was the perfect groupset.
My vote is the spacers order also.
I had something similar and eventually realised that the cassette has 3 different thickness of spacers. Once resolved, no more indexing issue.
Thank you all for your comments. I have tried a different hanger (the frame is carbon fibre, so I doubt that will be bent). I didn't know there were different spacer widths, so will check that.
Cheers
I thought Chorus cassettes were mostly booked together?
There's a 2.3mm spacer in there, along with the 2.2mm spacers.
It could be a problem with the cable somewhere, have you replaced them recently? Or has this just started happening out of the blue?
Unlikely to be worn shifters, since there's not really anything to wear out in the 11v shifters (unlike the 10v shifters, wear G springs wear). Sometimes the bolt on that holds the shifter mechanism together can loosen off, which can affect shifting. Bit of a faff to check this though, as it requires you to remove the shifter from the bar.