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Old 12-07-10, 09:55 PM   #1
Handelfan
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Chainring Question

Hello All -

My bike has an all-Shimano Tiagra setup, originally with a standard double crank (52/39). A while back, I had the small ring changed out for an FSA 38-tooth ring (along with the cassette), just to make my climbing gears a bit smaller. Now I would like to change out the big ring as well, so that the chainrings match in color, without much change in quality of operation. (Tiagra - standard chrome, FSA rings are black.) Not an expensive switch, really.

I was looking at the FSA super rings (they have one in 53t), but most of them say "use with 39t". The rings are all the same size bolt pattern (130) but how much of a difference does tooth compatibility make? Would it be a problem to use a regular FSA big ring with a 38 tooth?

Also, Tiagra is 9-speed. How much difference does speed compatibility play in chainrings?
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Old 12-07-10, 10:06 PM   #2
fietsbob 
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A go ahead it won't matter, Since cassettes are 11 and 12 tooth 48t should be big enough

as more cogs are added in the rear stack, chain has to be thinner

so chainrings have to be thinner too, made a bit closer together also.
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Old 12-09-10, 01:23 AM   #3
badamsjr
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Quote:
Originally Posted by Handelfan View Post
Hello All -

My bike has an all-Shimano Tiagra setup, originally with a standard double crank (52/39). A while back, I had the small ring changed out for an FSA 38-tooth ring (along with the cassette), just to make my climbing gears a bit smaller. Now I would like to change out the big ring as well, so that the chainrings match in color, without much change in quality of operation. (Tiagra - standard chrome, FSA rings are black.) Not an expensive switch, really.

I was looking at the FSA super rings (they have one in 53t), but most of them say "use with 39t". The rings are all the same size bolt pattern (130) but how much of a difference does tooth compatibility make? Would it be a problem to use a regular FSA big ring with a 38 tooth?

Also, Tiagra is 9-speed. How much difference does speed compatibility play in chainrings?
Most Shimano rings have that warning--"only use with 39A" for example. They match ring sets for ease of shifting, I guess. Not being one to let some company tell me which ring I can use with another one, I do not pay much attention to the warnings. I have some 52/34 cranksets that work fine, although they MAY not have the best ease of shifting. They shift for me, so that's good enough for me.

The only way you will find out if a certain combination will work for you is to try it. Good luck.
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