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Swapping rings on an FSA crank

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Swapping rings on an FSA crank

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Old 10-26-14, 08:55 PM
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Swapping rings on an FSA crank

I have an FSA SLK crank that has a worn top chain ring. It's currently running 53-39 chainrings. Can I install a 52 or 50 tooth ring, or will I have to buy a new crankset to install a ring with different sized teeth?
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Old 10-26-14, 08:59 PM
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On that crank you can put rings as small as 38 teeth. 50 or 52 as the big ring is no problem at all.
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Old 11-24-14, 03:07 AM
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Originally Posted by rpenmanparker
On that crank you can put rings as small as 38 teeth. 50 or 52 as the big ring is no problem at all.
Just to clarify, I can't put on a 34t ring, correct?
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Old 11-24-14, 04:58 AM
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Negative to the 34t. Likely smallest you can go is 38t on the inner ring. You can put a 48 or 50t on the outer ring however.
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Old 11-24-14, 05:26 PM
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Originally Posted by Campag4life
Negative to the 34t. Likely smallest you can go is 38t on the inner ring. You can put a 48 or 50t on the outer ring however.
I'll probably go for a 48/38. What is it about the design on the crankset that prevents you from fitting a 36 or 34 on the inner ring?

Is the difference between a 48x11 and 50x11 negligible?

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Old 11-24-14, 05:41 PM
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Originally Posted by amazinmets73
I'll probably go for a 48/38. What is it about the design on the crankset that prevents you from fitting a 36 or 34 on the inner ring?

Is the difference between a 48x11 and 50x11 negligible?
You have to make sure the Bolt Circle Diameter matches on the new rings. A 53/39 is usually a 130mm BCD, while a 50/34 is a 110mm BCD.

The bolt circle diameter also sets a lower limit on the number of teeth a ring can have. Here's a 38T 130BCD chainring, but the maker notes that the chain will probably contact the crank spider so realistically 39T is as small as you can go.

130 BCD Cyclocross Chainrings ? wolftoothcomponents.com

48 x 11 and 50 x 11 difference being negligible really depends on you and the riding you do on the bike. I'd notice it on the road but not on a limestone trail, for instance.
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