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Chain rubbing Big Ring(8 posts)

Chain rubbing Big RingCrashd
Mar 13, 2002 6:56 AM
Has anyone had a problem with their chain rubbing the inside of the big chainring when in the small/small combo? How can I fix this?
Mar 13, 2002 7:12 AM
Don't use the small/small combo. It isn't good for your chain. It will cause undue wear and tear.
Mar 13, 2002 8:10 AM
Not as simple as it appears...Crashd
Mar 13, 2002 8:10 AM
I know not to ride in the sm/sm, but at times it is necessary. My problem is that this also happens from about 5 all the way down to 8. This makes the half-shift from the small chain ring to the big ring useless, because the chain hits the big ring before touching the guide.
Check the archivesSpoke Wrench
Mar 13, 2002 8:33 AM
I'm assuming you have a splined Shimano crankset. We had a pretty significant discussion of this a couple of weeks ago. Solutions include putting a 2mm spacer under the right side of your bottom bracket or using an XTR 112.5 bottom bracket.
Mar 13, 2002 8:42 AM
re: Chain rubbing Big RingChen2
Mar 14, 2002 9:01 AM
Also, I've seen this problem when one of the chain rings is mounted backwards. I don't think chain rub on the big ring is ever normal, common maybe, but not normal.
Ultegra, right?bianchi
Mar 14, 2002 12:11 PM
Spoke Wrench is right. We had a fairly long and entertaining thread on this issue a few weeks ago. It could have turned into a brawl if we had been in a bar somewhere.