Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Bikes: 7⃥ 9 road bikes
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here's what i know about chainring bolts.
come in aluminum or steel. there are five of them. pretty standard (one of the few on bikes, it seems) design.
length is usually determined by crank type. most LBS's will want to know how many chainrings are on your crank. single/track (1), traditional road (2), or MTB (3). i doubt if they know offhand the length of any of them, although they might make a good guess. cost (5), 10-20 bucks?