Just FYI, I have gone between a Double & Triple and also ran a 1X10 for 4000 miles;



and this Sram Cyclocross double w/ 46t & 38T chainrings;



Drivetrain changes were made mostly to experiment. The Sram Cyclocross 46 & 38t double worked fine, but I rarely used the 38t chainring. I installed a 44t single chainring and used that for 4000 miles with a 12-27 10 speed cassette. This set-up forced me to charge up every hill out of fear of bogging down. The range also required a rapid cadence at higher speeds. I put a 50, 39 & 30t triple crankset on the bike this month. My plan is to ride more hilly Century rides next year. I use the 39t chainring 80% of the time and only need the 50t above 26 mph. The 30t chainring is really not needed, but will be used as a convenience a few times a month.

This compact with a 12-27 cassette should work well: http://www.backcountryoutlet.com/out...-Crankset.html

You will also need BB cups for about $40. Your existing derailluar should work OK after adjusting it. You will be switching beteen the 50t & 34t chainrings more often than when you depended on the 39t middle ring on your triple.

Michael

Michael