Gear chart using Gear Inches

For 650 x 38b / 38-584 650B tire with 170 mm cranks
With 9-speed as 11-13-15-17-20-23-26-30-34 Cassette

	30	40.0 %	42	23.8 %	52
11	70.9		99.3		122.9
18.2 %
13	60.0		84.0		104.0
15.4 %
15	52.0		72.8		90.1
13.3 %
17	45.9		64.2		79.5
17.6 %
20	39.0		54.6		67.6
15.0 %
23	33.9		47.5		58.8
13.0 %
26	30.0		42.0		52.0
15.4 %
30	26.0		36.4		45.1
13.3 %
34	22.9		32.1		39.8

This small version of the chart can be printed, cut out, and taped to your bicycle for reference.

70.9	99.3	122.9
60.0	84.0	104.0
52.0	72.8	90.1
45.9	64.2	79.5
39.0	54.6	67.6
33.9	47.5	58.8
30.0	42.0	52.0
26.0	36.4	45.1
22.9	32.1	39.8

Note: This is under construction, and the print function does not yet work.

Gear Chart by Sheldon Brown
http://sheldonbrown.com/gears