Gearing Ratios

Posted by simon | On Sunday, 10 April 2005

Remember in high school, doing math you thought you'd never use? Well Gearing Ratios is one of those things!

In general:

A smaller front (countershaft) sprocket or larger rear sprocket will make your bike accellerate faster, but have a lower top speed. It will also make the chain slightly looser, and you will probably need to move the rear wheel back slightly to compensate. This creates a lower gearing ratio

A larger front sprocket or smaller rear sprocket will make your top speed faster, but your accelleration will be slower. You may need to move the rear wheel forward slightly. This creates a higher gearing ratio

As a general rule, changing one tooth on the front sprocket is roughly equal to changing the rear by four teeth!

Now for the ratios

Front		Rear	Ratio
13	X	40	3.08
13	X	41	3.15
13	X	42	3.23
13	X	43	3.31
13	X	44	3.38
13	X	45	3.46
13	X	46	3.54
13	X	47	3.62
13	X	48	3.69
13	X	49	3.77
13	X	50	3.85
13	X	51	3.92
13	X	52	4
13	X	53	4.08
13	X	54	4.15
13	X	55	4.23

Front		Rear	Ratio
14	X	40	2.86
14	X	41	2.93
14	X	42	3
14	X	43	3.07
14	X	44	3.14
14	X	45	3.21
14	X	46	3.29
14	X	47	3.36
14	X	48	3.43
14	X	49	3.5
14	X	50	3.57
14	X	51	3.64
14	X	52	3.71
14	X	53	3.79
14	X	54	3.86
14	X	55	3.93

Front		Rear	Ratio
15	X	40	2.67
15	X	41	2.73
15	X	42	2.8
15	X	43	2.87
15	X	44	2.93
15	X	45	3
15	X	46	3.07
15	X	47	3.13
15	X	48	3.2
15	X	49	3.27
15	X	50	3.33
15	X	51	3.4
15	X	52	3.47
15	X	53	3.53
15	X	54	3.6
15	X	55	3.67

Front		Rear	Ratio
16	X	40	2.5
16	X	41	2.56
16	X	42	2.63
16	X	43	2.69
16	X	44	2.75
16	X	45	2.81
16	X	46	2.88
16	X	47	2.94
16	X	48	3
16	X	49	3.06
16	X	50	3.13
16	X	51	3.19
16	X	52	3.25
16	X	53	3.31
16	X	54	3.38
16	X	55	3.44

Tags:

Motocross

Enduro

Comments

mxdave

Thu, 06/10/2005 - 04:50

Permalink

hey simon

hey i dont mean to sound thick but all this gear ration does not mean anything to me well i get the main part 16 X 55 but i dont get the 3.44 part sorry for pissing u off with this question