All depends on your speed and cadence. I ride mostly flat terrain and would hate a 14-28 that most are recommending. Way too much difference between shifts for me. On a 6 speed, I like a 13-23 because I get 2-3mph out of each shift. 23 rear is a 14-16 mph gear all day long and 13 can get you to 30+ when you have that strong flatland wind at your back. Granted there's no bailout gear but that's what the front derailleur is for!
Last edited by plonz; 06-28-16 at 10:50 PM.