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chainring / chainstay clearance question(3 posts)

chainring / chainstay clearance questionrockbender
Apr 30, 2003 10:11 AM
How close would you comfortably place your small chainring to the chainstay (double Ultegra / Caad 5... FWIW)?

I am setting up my bike for a multisport race that has a bike leg that is essentially a downhill TT, so I plan on running 52-60. The problem is that I have less than an eighth of an inch clearance between the small ring and chainstay. I am concerned that flex or other things (peace of mind)might require additional clearance. Thoughts? If I have to spend $, I think i would opt for a 48T chainring before getting a wider BB.

On a similar note, any adverse affects to running a ring bacwards? i.e., if I took my 52 that was normally a 'big' ring and flipped it 180 degrees and mounted it as the 'small' ring (assuming not too much wear)?

Seems like I've read that 3mm is about the minimum....cory
Apr 30, 2003 12:05 PM
Can't remember the source, but I think I remember reading that 3mm is the minimum you can get away with. In that case 1/8 inch (3.175mm) would be OK...but it sure LOOKS tight when I look at it on a ruler, and I assume that was with a typical small ring, whick would move less at the circumference. I'd be worried, too (so how much did this help?).
Problem solved ( I hope)rockbender
Apr 30, 2003 1:05 PM
I went down to the LBS and picked up a 48T ring to use for my small ring. I think that it should provide enough clearance to end my worries - we'll see when I get home tonite.

I agree... it just didn't look right!