Join Date: Jul 2010
Location: SLO County, CA
Bikes: 2011 Specialized Tarmac Comp
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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?