Thanks GMAN and Tom. GMAN, I don't need a 1:1 ratio as all of my rides are commuting. Here's the set up: Surly LHT, BBSHD, 5PAS, 52v 13.5ah battery, Luna 42 chainring, 10 speed 11-28 cassette. Currently, my 16 mile commute is spent in gears 11,12,13,14,15, 11t on the flats at 28-30 mph barely...