Single Speed Gear Ratio Chart

Single Speed Gear Ratio Charts

Having trouble picking out the right gear ratio for your single speed? Check out these charts to help you make the right decision. There’s a wee bit of science/math involved here. If you are a beginner to single speed mountain biking, 32/19 is a common starting point, but to get the best understanding we recommend you check out this video by our friend at DirtWire.tv

Basic Single Speed Gear Ratio Chart

	28	30	32	33	34	36	39
14	2.00	2.14	2.29	2.36	2.43	2.57	2.19
15	1.87	2.00	2.13	2.20	2.27	2.40	2.60
16	1.75	1.88	2.00	2.06	2.13	2.25	2.44
17	1.65	1.76	1.88	1.94	2.00	2.12	2.29
18	1.56	1.67	1.78	1.83	1.89	2.00	2.17
19	1.47	1.58	1.68	1.74	1.79	1.89	2.05
20	1.40	1.50	1.60	1.65	1.70	1.80	1.95
21	1.33	1.43	1.52	1.57	1.62	1.71	1.86
22	1.27	1.36	1.45	1.50	1.55	1.64	1.77
23	1.22	1.30	1.39	1.43	1.48	1.57	1.70
24	1.17	1.25	1.33	1.38	1.42	1.50	1.63
25	1.12	1.20	1.28	1.32	1.36	1.44	1.56

27.5 Gear Inches

	28	30	32	33	34	36
14	55.00	58.93	62.86	64.82	66.79	70.71
15	51.33	55.00	58.67	60.50	62.33	66.00
16	48.13	51.56	55.00	56.72	58.44	61.88
17	45.29	48.53	51.76	53.38	55.00	58.24
18	42.78	45.83	48.89	50.42	51.94	55.00
19	40.53	43.42	46.32	47.76	49.21	52.11
20	38.50	41.25	44.00	45.38	46.75	49.50
21	36.67	39.29	41.90	43.21	44.52	47.14
22	35.00	37.50	40.00	41.25	42.50	45.00
23	33.48	35.87	38.26	39.46	40.65	43.04
24	32.08	34.38	36.67	37.81	38.96	41.25
25	30.80	33.00	35.20	36.30	37.40	39.60

27.5+ Gear Inches

	28	30	32	33	34	36
14	57.00	61.07	65.14	67.18	69.21	73.29
15	53.20	57.00	60.80	62.70	64.60	68.40
16	49.88	53.44	57.00	58.78	60.56	64.13
17	46.94	50.29	53.65	55.32	57.00	60.35
18	44.33	47.50	50.67	52.25	53.83	57.00
19	42.00	45.00	48.00	49.50	51.00	54.00
20	39.90	42.75	45.60	47.03	48.45	51.30
21	38.00	40.71	43.43	44.79	46.14	48.86
22	36.27	38.86	41.45	42.75	44.05	46.64
23	34.70	37.17	39.65	40.89	42.13	44.61
24	33.25	35.63	38.00	39.19	40.38	42.75
25	31.92	34.20	36.48	37.62	38.76	41.04

29 Gear Inches

	28	30	32	33	34	36
14	58.00	62.14	66.29	68.36	70.43	74.57
15	54.13	58.00	61.87	63.80	65.73	69.60
16	50.75	54.38	58.00	59.81	61.63	65.25
17	47.76	51.18	54.59	56.29	58.00	61.41
18	45.11	48.33	51.56	53.17	54.78	58.00
19	42.74	45.79	48.84	50.37	51.89	54.95
20	40.60	43.50	46.40	47.85	49.30	52.20
21	38.67	41.43	44.19	45.57	46.95	49.71
22	36.91	39.55	42.18	43.50	44.82	47.45
23	35.30	37.83	40.35	41.61	42.87	45.39
24	33.83	36.25	38.67	39.88	41.08	43.50
25	32.48	34.80	37.12	38.28	39.44	41.76