Originally Posted by
pocky
....your highest gear in the back is already an 11, so I suspect you'll get a bigger performance boost out of bigger chainrings. I suspect I'd be topping out in the 46/11 combination a lot with your setup --
I wouldn't be too sure about that. I run a 42 big on my commuter, and on a 16 mile commute in suburban/city riding I'm off power for maybe one minute or so. I can still hit 40 + KPH /25 + MPH, and I'm no spinning guru. The OP should be able to hit 30 MPH w/o spinning out and needing a bigger ring.