The numbers below reflect the range of speeds when pedaling at a cadence of 60 rpm in the lowest gear to 90 rpm in the highest gear. While many cyclists ride at cadences outside this range these are reasonable figures for many riders to sustain for long periods.
The table is ordered as follows, with speed in MPH:
Description / Lowest Gear Inches - Speed / Highest Gear Inches - Speed
6 sp std / 33.1 - 5.9 / 100.0 - 26.8
6 sp -12% / 29.1 - 5.2 / 88.0 - 23.6
6 sp +8% / 35.7 - 6.4 / 108.0 - 28.9
3 sp std / 47.9 - 8.6 / 84.9 - 22.8
3 sp -12% /42.1 - 7.6 / 74.7 - 20.0
3 sp -18% /39.1 - 7.0 / 69.4 - 18.6
3 sp +8% / 51.7 - 9.3 / 91.7 - 24.6
2 sp std / 56.0 - 10.1 / 74.7 - 20.0
2 sp -7% / 51.9 - 9.3 / 69.2 - 18.5
2 sp -19 % / 45.7 - 8.2 / 60.9 - 16.3
1 sp std / 74.7 - 13.4 / 74.7 - 20.0
1 sp -7% / 69.2 - 12.4 / 69.2 - 18.5
1 sp -19 % / 60.9 - 10.9 / 60.9 - 16.3
So for LDier, the 3sp with -18% gearing he would ride uphill at 7.0 mph while cranking at a cadence of 60 and on the flats would hit 18.6 mph when spinning at 90 rpm cadence. With my 6 spd with -12% I ride uphill at 5.2 mph while cranking at a cadence of 60 and on the flats would hit 23.6 mph when spinning at 90 rpm cadence.
Last edited by DoubleDiamonDog; 09-30-14 at 11:59 AM.