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Can I change out my front 39T chainring and put on a 36T one that will fit? The make is FSA. I realize that is it a compact ring but wondering if anyone knows if the bolts will match up? Can this work.. I already have a 12-27 that I am using so please don't tell me to do that instead.
 

· NeoRetroGrouch
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cannondale_boy said:
Can I change out my front 39T chainring and put on a 36T one that will fit? The make is FSA. I realize that is it a compact ring but wondering if anyone knows if the bolts will match up? Can this work.. I already have a 12-27 that I am using so please don't tell me to do that instead.
A normal 39/53 (Shimano standard) has a 130 Bolt Circle Diameter (BCD) and will take a 38 tooth ring minimum. - TF
 

· uhhhh, what?
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as tt already said, yer screwed due to the 130 bcd. but, 12-27 sounds like you're running shimano. if you want to go lower but don't want to swap cranksets, you can always go for a 12-32 mtb cassette & matching med/long cage mtb derailleur. keep it at the lx pricepoint and it's pretty cheap, but still works flawlessly.
 

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cannondale_boy said:
Can I change out my front 39T chainring and put on a 36T one that will fit? The make is FSA. I realize that is it a compact ring but wondering if anyone knows if the bolts will match up? Can this work.. I already have a 12-27 that I am using so please don't tell me to do that instead.
Despite what many people think, the bicycle is a really simple device. If you just look at the 39t on the crank, you will see that there is virtually no way to find space for a smaller ring. While 38s are available, even that situation results in the chain ring bolts just touching the chain each time they pass. A 36 is simply not possible, which you can easily see when you look at the 39.
 
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