Rider Size and Bike Frame

Rider Height	Frame Size	Top Tube	Stem	Bar Rise	Bar Width	Cranks	Gearing
4 & under	Micro-Mini	15-16	Mini	2-2.5	20-22.5	150-160mm	41-43/16
4-4.6	Mini	16-17	Mini-Mini XL	2-3.5	21-23.5	155-165mm	41-43/16
4.4-4.10	Junior	17-18.5	Mini XL-Pro	3-5	22-25	160mm-175mm	42-43/16
4.8-5.4	Expert	18.5-19.5	Pro	5-7	25.5-27	170mm-175mm	42-43/16
5.4-5.10	Pro	20-20.5	Pro-Pro XL	7-8	27-28	175mm-180mm	43-44/16
5.10 & over	Pro XL-XXL	20.5 & Over	Pro XL-XXL	7-8	28.5(max)	180mm-185mm	44/16 & Over

Crank Length

Riders Inseam	Crank Length
20	140mm
21	145mm
22	150mm
23	155mm
24	160mm
25	162mm
26	166mm
27	171mm
28	175mm
29	177mm
30	180mm
31	182mm
32	185mm
33	190mm

Wheel Size

Max Rider Weight	65 lbs	90 lbs	120 lbs	150 lbs	140 lbs
Rim Width	1.00	1 1/8	1 3/8	1.50	1.75

Rollout and Rear Tire Size in Inches

20 X 1.75 Gear Chart

Chain Wheel	Freewheel 14	Freewheel 15	Freewheel 16	Freewheel 17	freewheel 18
34	47.4	44.3	41.5	39.0	36.8
35	48.7	45.4	42.7	40.2	37.8
36	50.2	46.0	43.6	41.3	39.0
37	51.6	48.1	45.1	42.5	40.1
38	53.0	49.4	46.3	43.6	41.2
39	54.4	50.7	47.5	44.7	42.3
40	55.7	52.0	48.8	45.9	43.3
41	57.1	53.3	50.0	47.0	44.4
42	58.5	54.6	51.2	48.2	45.5
43	59.9	55.9	52.4	49.4	46.6
44	61.9	57.2	53.7	50.5	47.7
45	62.7	58.5	54.9	51.7	48.8
46	64.1	59.8	56.1	52.8	49.9

20 X 1.50 Gear Chart

Chain Wheel	Freewheel 14	Freewheel 15	Freewheel 16	Freewheel 17	freewheel 18
34	46.8	43.6	40.9	38.5	36.4
35	48.1	44.9	42.1	49.6	37.4
36	49.5	46.2	43.3	40.8	38.5
37	50.9	47.4	44.5	41.9	39.6
38	52.3	48.8	45.7	43.1	40.6
39	53.6	50.1	46.9	44.1	41.7
40	55.0	51.3	48.1	45.2	43.8
41	56.4	52.8	49.3	46.4	43.9
42	57.5	53.9	50.5	47.5	44.9
43	59.1	55.2	51.7	48.7	46.0
44	60.5	56.5	52.9	49.8	47.0
45	61.8	57.7	54.1	51.0	48.1
46	63.2	59.1	55.3	52.2	49.2

20 X 1 3/8 Gear Chart

Chain Wheel	Freewheel 14	Freewheel 15	Freewheel 16	Freewheel 17	freewheel 18
34	51.0	47.6	44.6	42.0	39.7
35	52.5	49.0	45.9	43.2	40.7
36	54.0	50.4	47.3	44.5	42.0
37	55.5	51.6	48.6	45.7	43.2
38	57.0	53.2	49.9	47.0	44.4
39	58.5	54.6	51.2	48.2	45.5
40	60.0	56.0	52.5	49.4	46.7
41	61.5	57.4	53.9	50.7	47.9
42	63.0	58.8	55.2	51.9	49.0
43	64.5	60.2	56.5	53.2	50.2
44	66.0	61.6	57.8	54.4	51.4
45	67.5	63.0	59.1	55.6	52.5
46	69.0	64.4	60.4	56.9	53.7

20 X 1 1/8 Gear Chart

Chain Wheel	Freewheel 14	Freewheel 15	Freewheel 16	Freewheel 17	freewheel 18
34	48.6	45.3	42.5	40.0	37.7
35	50.0	46.7	43.8	41.2	38.8
36	51.4	48.0	45.0	42.3	40.0
37	52.8	49.3	46.2	43.5	41.1
38	54.3	50.7	47.5	44.7	42.2
39	55.7	52.0	48.7	45.9	43.3
40	57.1	53.3	50.0	47.0	44.4
41	58.6	54.7	51.2	48.2	45.6
42	60.0	56.0	52.5	49.4	46.7
43	61.4	57.3	53.7	50.6	47.8
44	62.8	58.7	55.0	51.8	48.9
45	64.3	60.0	56.2	52.9	50.0
46	65.7	61.3	57.5	54.1	51.1

24 X 1.75 Gear Chart

Chain Wheel	Freewheel 14	Freewheel 15	Freewheel 16	Freewheel 17	freewheel 18
34	58.3	54.4	51.0	48.0	45.3
35	60.0	56.0	52.5	49.4	46.5
36	61.7	57.6	54.0	50.0	48.0
37	63.3	59.3	55.5	52.2	49.4
38	65.0	60.7	57.0	53.6	50.7
39	66.9	62.4	58.5	55.1	52.0
40	68.6	64.1	60.0	56.5	53.3
41	70.3	65.5	61.4	57.9	54.7
42	72.0	67.2	63.1	59.3	56.0
43	73.7	68.9	64.5	60.7	57.3
44	75.3	70.3	66.0	62.1	58.5
45	77.0	72.0	67.4	63.6	60.0
46	78.9	73.7	69.1	65.0	61.4

24 X 1 1/8 Gear Chart

Chain Wheel	Freewheel 14	Freewheel 15	Freewheel 16	Freewheel 17	freewheel 18
34	54.9	51.3	48.1	45.2	42.7
35	56.5	52.8	49.5	46.6	43.9
36	58.1	54.3	50.9	47.9	45.2
37	59.7	55.8	52.3	49.3	46.6
38	61.3	57.3	53.7	50.6	47.7
39	63.1	58.8	55.1	51.9	49.1
40	64.7	60.3	56.6	53.2	50.3
41	66.3	61.8	57.9	54.6	51.5
42	67.9	63.3	59.5	55.9	52.8
43	69.4	64.9	60.8	57.2	54.0
44	71.0	66.3	62.2	58.6	55.3
45	72.6	67.9	63.9	59.9	56.6
46	74.4	69.4	65.1	61.3	57.9