-
...there was no rub with her square taper Chorus cranks, is this normal when changing to Ultra Torque?
I couldn't say: perhaps the ST cranks sit a little wider?
...she's now claiming rubbing on 13t, 14t & 15t...
Derailleur, rather than chainring? Check she doesn't have the FD in the trimmed position, rather than all the way over.
Scilly.Suffolk-
I couldn't say: perhaps the ST cranks sit a little wider?
The UT must be closer, as nothing else has changed. Just seems a little strange that it would put the chainline out this much?
Derailleur, rather than chainring?
I done a check through with the bike on a stand, and reset the RD, it didn't make any difference. When I was checking there was a definite pinging/rattling of the chain on the back on the 53 ring when in the 13t. The FD trimming isn't the issue here, as its totally clear of that area. It just chainring rub.
Muppetteer
Okay, well I guess thats the answer I was looking for. I'll have to break the bad news to her. Just out of interest, there was no rub with her square taper Chorus cranks, is this normal when changing to Ultra Torque?
And unfortunately, a single ring would be ruled out immediately. We're in South London, and to escape out of the London, there's quite a few hills she needs to go up and down. She does shift, its just getting her into the habit of shifting before the rubbing starts.
Incidentally, she's now claiming rubbing on 13t, 14t & 15t, although I've yet to confirm. Should the chain rub be this bad?