I have a bike with a 46/36T crankset (FSA Gossamer Cross BB30) and I'd like to change the small chainring to an even smaller one.
Googling around suggests that the smallest chainring I can get for a 110mm BCD crankset is 33T. Is that right?
Furthermore, it seems that I won't need to replace anything else at all, not even the chain. I run an Ultegra RD-6800-SS rear mech with an 11-28T cassette and all the specs seem to check out:
- Max front difference: 16T (in my case, 46-33=13).
- Total capacity: 33T (in my case, (46-33)+(28-11)=30).
So just swap out the chainring and good to go, or am I overlooking something? (Never done this before.)
Finally, how do I make sure that the chainring I buy is compatible with my drivetrain? It seems that the BCD (110mm) is all that matters, so something like TA 110 PCD Zephyr would work?
P. S. As I am looking at a picture of the Zephyr chainring, I notice that it says "9/10 speed". What does that mean exactly? (My drivetrain is 11-speed.)
P. P. S. This page lists what looks like the same product as compatible with 8/9/10/11 speeds, but with the following cryptic remark: "For 10-/11-speed drives only with 1 or 2-speed crank handle!" Are they simply trying to say it's too thick for a triple chainset or does this refer to something else?