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105 Gear Range(2 posts)

105 Gear RangeMatno
May 31, 2002 11:55 AM
I'm building up a 105/Ultegra 9 speed setup and was wondering if I can expect to get any chain rub in certain gear combinations or will it pretty much do the whole 18 speeds without rubbing? On my MTB with XT/XTR I can do all 27 speeds without significant rubbing (although I never really ride cross-chained). However, I'm wondering if this will be different with the 39/53 cranks of a road bike (105) since I tend to use the front derailleur less often. For what it's worth, I'm sticking with a non-9speed front derailleur for now (front is friction anyway).
re: 105 Gear Rangedavet
May 31, 2002 12:25 PM
With a friction front derailleur, you should be able to trim away any chain rub on the front der. Chain rub on the big ring when in the small/small combo (small ring & smallest cog) can be a matter of chainstay length. With shorter chainstays, the angle of departure of the chain, ring to cog, is greater and the chain can rub. The longer the chainstays, the less the angle of departure is and the likelyhood of chainrub on the big ring is less. You won't know if this is going to happen until you build your bike.