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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)?

thanks-
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!