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Easy question: chainring compatibility

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Easy question: chainring compatibility

Old 06-22-09, 06:42 PM
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a_elephant
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Easy question: chainring compatibility

Is BCD the *only* determinant of chainring/crank compatibility?

I'd like to buy a new chainring for my bike. The current one is 130 BCD, 3/32. Will *any* 130 BCD, 3/32 chainring fit?

This is for a fixed gear, so I know chainline can be an issue. AFAIK chainrings don't alter chainline, excepting for inside or outside attachment to the crank arm. Let me know if there's something else I need to think about here.

Thanks!
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Old 06-22-09, 07:28 PM
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Jeff Wills
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Originally Posted by a_elephant View Post
This is for a fixed gear, so I know chainline can be an issue.
For SS/FG use, you should be OK. With some crankarms & chainrings there can be issues with spacing and orientation between rings, but most of those can be compensated for with spacer washers.
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Old 06-22-09, 07:45 PM
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Perhaps the number of mounting holes?
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Old 06-22-09, 07:56 PM
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Originally Posted by Mondoman View Post
Perhaps the number of mounting holes?
I've yet to see a non 5-bolt 130bcd chainring.
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Old 06-22-09, 07:57 PM
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Originally Posted by a_elephant View Post
Is BCD the *only* determinant of chainring/crank compatibility?

I'd like to buy a new chainring for my bike. The current one is 130 BCD, 3/32. Will *any* 130 BCD, 3/32 chainring fit?

This is for a fixed gear, so I know chainline can be an issue. AFAIK chainrings don't alter chainline, excepting for inside or outside attachment to the crank arm. Let me know if there's something else I need to think about here.

Thanks!
For a singlespeed crankset, in your situation any 130bcd 3/32 will work. Including all 8/9/10 speed "shimano compatible" rings and any "single speed" chainrings. Rocket rings etc. et al. Some of the cheaper chainrings *may* not fit properly even though they are the same bcd as your crank.

Doesn't happen very often but something to watch out for.
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Old 06-22-09, 07:59 PM
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Originally Posted by Jeff Wills View Post
For SS/FG use, you should be OK. With some crankarms & chainrings there can be issues with spacing and orientation between rings, but most of those can be compensated for with spacer washers.
I can't think of a single situation where you would need chainring bolt spacers to fit a proper bcd chainring on a crank. The more you space out a chainring (this is only necessary to "fix" chainline the improper way), the greater chance you have of suiciding the ring under load. I've seen it happen.
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