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"Problem:Chainring chain tracking- Shimano Ultegra"(3 posts)

"Problem:Chainring chain tracking- Shimano Ultegra"bronzest
Sep 1, 2002 8:41 AM
Problem- when the chain is turning on the 39T chainring and either the 8 or 9 sprocket of the 9 spd cassette the side of the chain rubs against the inside of the 53T chainring. Is there an adjustment that can be made to correct the alignment between the chainring and cassette? All components are Ultegra. THANKS!
You are 'cross-chaining'......gogene
Sep 1, 2002 9:03 AM
......and that is not good for your drivetrain. Cross-chaining puts undue stress on your chainrings and chain, and will lead to premature wear. That said, the 'chainrub' you are experiencing usually happens on a bike with short chainstays. With short chainstays the angle of departure from the small ring to the smaller cogs is larger than the same equipment used on bikes with longer chainstays. The easiest, simplest and best way to eliminate 'chainrub' is NOT to cross-chain. There are other gear combos that will give you the same gear inches that are kinder to your drivetrain and your ears. However, if you insist on cross-chaining, you can put a .5mm spacer inside the driveside cup of your bottombracket to change your chainline and eliminate chain rub.
Must have been two weeks since since this came up last.Spoke Wrench
Sep 2, 2002 1:57 PM
The cheap, dirty solution is to put a 2mm spacer behind the right side of the bottom bracket. A more expensive but slightly more elegant solution is to get an XTR bottom bracket. It has the same spline as the Ultegra but a 112.5 spindle.