Calculate Gear Inches

Chain wheel (front) # of teeth

/

Free wheel (back) #of teeth

*

Wheel/Tire   Diameter

=

Gear inches

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A 700 x 23 is approxamatily 26.38" Diameter

# Chain Wheel teeth      :
# Free Wheel teeth        :
Diameter inches             :
Gear Inches                  : 

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Examples for Gear inches on my bikes

Road Bike Bianchi Nuevo Racing 700x23
chainwheel	freewheel	diameter	Gear inches
52	24	26.38	57.15
52	21	26.38	65.31
52	19	26.38	72.18
52	17	26.38	80.68
52	15	26.38	91.43
52	13	26.38	105.50
52	12	26.38	114.29
42	24	26.38	46.16
42	21	26.38	52.75
42	19	26.38	58.30
42	17	26.38	65.16
42	15	26.38	73.85
42	13	26.38	85.21
42	12	26.38	92.31
Road Bike Bianchi Virata 700x23
chainwheel	freewheel	diameter	Gear inches
50	26	26.38	50.72
50	23	26.38	57.34
50	21	26.38	62.80
50	19	26.38	69.41
50	17	26.38	77.57
50	15	26.38	87.92
50	14	26.38	94.20
50	13	26.38	101.44
50	12	26.38	109.90
50	11	26.38	119.89
34	26	26.38	34.49
34	23	26.38	38.99
34	21	26.38	42.70
34	19	26.38	47.20
34	17	26.38	52.75
34	15	26.38	59.78
34	14	26.38	64.05
34	13	26.38	68.98
34	12	26.38	74.73
34	11	26.38	81.52
Mountain bike  26x2.10
chainwheel	freewheel	diameter	Gear inches
42	28	26.13	39.19
42	24	26.13	45.72
42	21	26.13	52.25
42	18	26.13	60.96
42	15	26.13	73.15
42	13	26.13	84.40
42	11	26.13	99.75
34	28	26.13	31.72
34	24	26.13	37.01
34	21	26.13	42.30
34	18	26.13	49.35
34	15	26.13	59.22
34	13	26.13	68.33
34	11	26.13	80.75
24	28	26.13	22.39
24	24	26.13	26.13
24	21	26.13	29.86
24	18	26.13	34.83
24	15	26.13	41.80
24	13	26.13	48.23
24	11	26.13	57.00

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