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Old 04-22-09, 12:12 AM   #1
kmart
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Chainrings for 110BCD 5-arm crankset

So, I have this old crankset, a Race Face Deus XC (with the carbon fiber inserts and everything). It's got three 5-bolt 110 BCD chainrings. The largest ring has a few chipped teef. So far it hasn't caused me too many problems but I am considering some replacements. Correct me if I'm wrong but it seems that any replacement chainrings I find will be for road-bike compact cranks, since I don't think 5-bolt 110BCD is so common for MTBs, right? So, is it OK to use road-bike chainrings on a mountain bike, considering that MTB rings experience a lot more stressful shifts under load?

Last edited by kmart; 04-22-09 at 12:15 AM.
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Old 04-22-09, 02:05 AM   #2
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the inner rings don't take any more abuse, (can't bash em cause u'll just hit the big one) and roadies will load the crap outta the drivetrain so... the only one that would be a consideration would be the outter ring, and as far as a i know there wouldnt' be any differences in durablity exept for the following: a larger ring should bend easier especially b/c well its bigger and has more room to bend, also some road rings are super uber beefy and stiff to prevent chainring flex, think like the newer shimano stuff thats on the hollowtech 2 cranks

if bending is a real issue for you bbg makes bash rings for 110 rings, i've got one on my 130 bcd cx bike, and really on a mtn bike your not gonna want a 50t big ring, and really i'd run a bash, and then a std 34t "middle" ring and whatever you can get in a small ring, assuming you can find stuff designed to shift to each other (std compact has no granny) but i know i've seen triples with 110
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Old 04-29-09, 08:24 PM   #3
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A 110/74 mm five arm bolt pattern was one of the most common sizes found in mountain biking up until the late 1990s. Blackspire and others still make chanrings for this size.

http://www.blackspire.com/qs/product/83/5948/263225/0/0
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Old 04-30-09, 12:15 AM   #4
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Quote:
Originally Posted by kmart View Post
The largest ring has a few chipped teef.
Are you sure they're chipped? It's common for some teeth to be made shorter than others to help with shifting.
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Old 04-30-09, 07:55 PM   #5
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Yep, definitely chipped - noticeably shorter than the regular "short" teeth.
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Old 04-30-09, 08:30 PM   #6
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Origin8 makes rings for this, most bike shops can order these in. I have an older Shimano crank on one of my rigs and I used them to replace the two big rings. They are aluminum I believe, and are really light. Makes me wonder if they will hold up like the older ones did.
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