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Old 10-15-13 | 08:44 PM
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FBinNY
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Joined: Apr 2009
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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

On one hand 110 BCD is 110 BCD. All common cranks and rings use the same bolts and bolt circle.

But life is never that easy. While odds favor that any pair of rings will work on any crank, there are pitfalls.

1-some cranks and rings use a shoulder on the crank spider, with a turned ID on the ring, others don't. This can sometimes create a no-fit at the shoulder. It's solvable with a file, but if the arm has a nice shoulder to lean on, it's a good thing, and you want yo have rings that match. The diameters are the same, it's just whether you have that turned dimension.

2- there are sometimes variations in the position of the teeth with respect the chainring face. Doesn't matter if you replace a pair of rings, but can (pretty rarely) if you replace only one ring.

3- most 5 pin cranksets have the arm between 2 bolts. But a few use the arm as one of the mounts. The rings fit, but the small stop pin on the outer is in the wrong place. That's why some replacement outer rings have a threaded pin and two holes to choose from.

So it's probably OK, but there are some traps.
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