Originally Posted by
urbanknight
I'm actually going to disagree with Merlin about the 11. Although it is perfectly possible to pedal to 45mph+ with a compact and a 12, sustained descents are much more comfortable at a cadence lower than about 120 (at least for me).
honestly, I missed that the OP was using a compact. I'll agree that there's more reason to run an 11 with a 50 tooth big ring.
Also, I get that bigger than a 53/12 may allow you to run a desired cadence on a decent. What gets me going is the repeated assertion on BF that "I need an 11 because I spin out my 12"