rear sprocket

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rear sprocket

Post  dougyfresh on Sun Apr 29, 2012 6:18 pm

hi,my xrr has a 13t front and a 45t rear, as i bought it, have been told this works out same as stock
happy with the bike as is, it came with spare 48t, was wondering what difference this would make, with the 13t on front
any help would be great....

dougyfresh
L Rider

Joined: 2012-04-09

Posts: 22
Location: s.wales
XR650R Year: 2001

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Re: rear sprocket

Post  MAUSER on Sun Apr 29, 2012 10:52 pm

14~48 is stock so that's same as 13~45...1 off the front is same as 3 off the rear.

_________________
Current ~  XR650R 2002 ~ XJR1300SP 2002 ~ ZX12-R 2005
Previous Bikes (2003 XR250-R3) (1990 DT125R) (1995 GPZ1100E1) (1981 350 LC) (1983 XL125R) (1981 MT5)

MAUSER
Administrator

Joined: 2010-09-13

Posts: 1163
Location: UK
XR650R Year: 2002

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Re: rear sprocket

Post  AURORA on Mon Apr 30, 2012 4:29 am

SPROCKET MATH

Calculating the sprocket drive ratio:

(Rear tooth count) / (front tooth count) = drive ratio

Example 1:
Bike ships stock with 47 tooth rear sprocket, 15 tooth front sprocket.
47 / 15 = 3.13333
So 3.13333 is the stock sprocket ratio.

Example 2:
You buy a 50 tooth rear sprocket and a 15 tooth front sprocket for the above bike.
50 / 15 = 3.33333
So 3.33333 is the new sprocket ratio.



GEARING CALCULATION HELP

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
9 1.00
10 1.11 1.00
11 1.22 1.10 1.00
12 1.33 1.20 1.09 1.00
13 1.44 1.30 1.18 1.08 1.00
14 1.56 1.40 1.27 1.17 1.08 1.00
15 1.67 1.50 1.36 1.25 1.15 1.07 1.00
16 1.78 1.60 1.45 1.33 1.23 1.14 1.07 1.00
17 1.89 1.70 1.55 1.42 1.31 1.21 1.13 1.06 1.00
18 2.00 1.80 1.64 1.50 1.38 1.29 1.20 1.13 1.06 1.00
19 2.11 1.90 1.73 1.58 1.46 1.36 1.27 1.19 1.12 1.06 1.00
20 2.22 2.00 1.82 1.67 1.54 1.43 1.33 1.25 1.18 1.11 1.05 1.00
21 2.33 2.10 1.99 1.75 1.62 1.50 1.40 1.31 1.24 1.17 1.11 1.05 1.00
22 2.44 2.20 2.00 1.83 1.69 1.57 1.47 1.38 1.29 1.22 1.16 1.10 1.05 1.00
23 2.56 2.30 2.09 1.92 1.77 1.64 1.53 1.44 1.35 1.28 1.21 1.15 1.10 1.05 1.00
24 2.67 2.40 2.18 2.00 1.85 1.71 1.60 1.50 1.41 1.33 1.26 1.20 1.14 1.09 1.04 1.00
25 2.78 2.50 2.27 2.08 1.92 1.79 1.67 1.56 1.47 1.39 1.32 1.25 1.19 1.14 1.09 1.04 1.00
26 2.89 2.60 2.36 2.17 2.00 1.86 1.73 1.63 1.53 1.44 1.37 1.30 1.24 1.18 1.13 1.08 1.04 1.00
27 3.00 2.70 2.45 2.25 2.08 1.93 1.80 1.69 1.59 1.50 1.42 1.35 1.29 1.23 1.17 1.13 1.08 1.04
28 3.11 2.800 2.55 2.33 2.15 2.00 1.87 1.75 1.65 1.56 1.47 1.40 1.33 1.27 1.22 1.17 1.12 1.08
29 3.22 2.90 2.64 2.42 2.23 2.07 1.93 1.81 1.71 1.61 1.53 1.45 1.38 1.32 1.26 1.21 1.16 1.12
30 3.33 3.00 2.73 2.50 2.31 2.14 2.00 1.88 1.77 1.67 1.58 1.50 1.43 1.36 1.30 1.25 1.20 1.15
31 3.44 3.10 2.82 2.58 2.39 2.21 2.07 1.94 1.82 1.72 1.63 1.55 1.48 1.41 1.35 1.29 1.24 1.19
32 3.56 2.20 2.91 2.67 2.46 2.29 2.13 2.00 1.88 1.78 1.68 1.60 1.52 1.46 1.39 1.33 1.28 1.23
33 3.67 3.30 3.00 2.75 2.54 2.36 2.20 2.06 1.94 1.83 1.74 1.65 1.57 1.50 1.43 1.38 1.32 1.27
34 3.78 3.40 3.09 2.83 2.62 2.43 2.27 2.13 2.00 1.89 1.79 1.70 1.62 1.55 1.48 1.42 1.36 1.31
35 3.89 3.50 3.18 2.92 2.69 2.50 2.33 2.19 2.06 1.94 1.84 1.75 1.67 1.59 1.52 1.46 1.40 1.35
36 4.00 3.60 3.27 3.00 2.77 2.57 2.40 2.25 2.12 2.00 1.89 1.80 1.71 1.64 1.57 1.50 1.44 1.38
37 4.11 3.70 3.36 3.08 2.85 2.64 2.47 2.31 2.18 2.06 1.95 1.85 1.76 1.68 1.61 1.54 1.48 1.42
38 4.22 3.80 3.45 3.17 2.92 2.71 2.53 2.38 2.24 2.11 2.00 1.90 1.81 1.73 1.65 1.58 1.52 1.46
39 4.33 3.90 3.55 3.25 3.00 2.79 2.60 2.44 2.29 2.17 2.05 1.95 1.86 1.77 1.70 1.63 1.56 1.50
40 4.44 4.00 3.64 3.33 3.08 2.86 2.67 2.50 2.35 2.22 2.11 2.00 1.91 1.82 1.74 1.67 1.60 1.54
41 4.56 4.10 3.73 3.42 3.15 2.93 2.73 2.56 2.41 2.28 2.16 2.05 1.95 1.86 1.78 1.71 1.64 1.58
42 4.67 4.200 3.818 3.500 3.231 3.000 2.800 2.625 2.471 2.333 2.211 2.100 2.000 1.909 1.826 1.75 1.68 1.62
43 4.78 4.300 3.909 3.583 3.308 3.071 2.867 2.688 2.529 2.389 2.263 2.150 2.048 1.955 1.870 1.79 1.72 1.65
44 4.89 4.400 4.000 3.667 3.385 3.143 2.933 2.750 2.588 2.444 2.316 2.200 2.095 2.000 1.913 1.83 1.76 1.69
45 5.00 4.500 4.091 3.750 3.462 3.214 3.000 2.813 2.647 2.500 2.368 2.250 2.143 2.045 1.957 1.88 1.80 1.73
46 5.11 4.600 4.182 3.833 3.538 3.286 3.067 2.875 2.706 2.556 2.421 2.300 2.190 2.091 2.000 1.92 1.84 1.77
47 5.22 4.700 4.273 3.917 3.615 3.357 3.133 2.938 2.765 2.611 2.474 2.350 2.238 2.136 2.043 1.96 1.88 1.81
48 5.33 4.800 4.364 4.000 3.692 3.429 3.200 3.000 2.824 2.667 2.526 2.400 2.286 2.182 2.087 2.00 1.92 1.85
49 5.44 4.900 4.455 4.083 3.769 3.500 3.267 3.063 2.882 2.722 2.579 2.450 2.333 2.227 2.130 2.04 1.96 1.88
50 5.56 5.000 4.545 4.167 3.846 3.571 3.333 3.125 2.941 2.778 2.632 2.500 2.381 2.273 2.174 2.08 2.00 1.92
51 5.67 5.100 4.636 4.250 3.923 3.643 3.400 3.188 3.000 2.833 2.684 2.550 2.429 2.318 2.217 2.13 2.04 1.96
52 5.78 5.20 4.73 4.33 4.00 3.71 3.47 3.25 3.06 2.89 2.74 2.60 2.48 2.36 2.26 2.17 2.08 2.00
53 5.89 5.30 4.82 4.42 4.08 3.79 3.53 3.31 3.12 2.94 2.79 2.65 2.52 2.41 2.30 2.21 2.12 2.04
54 6.00 5.40 4.91 4.50 4.15 3.86 3.60 3.38 3.18 3.00 2.84 2.70 2.57 2.46 2.35 2.25 2.16 2.08
55 6.11 5.50 5.00 4.58 4.23 3.93 3.67 3.44 3.24 3.06 2.90 2.75 2.62 2.50 2.39 2.29 2.20 2.12
56 6.22 5.60 5.09 4.67 4.31 4.00 3.73 3.50 3.29 3.11 2.95 2.80 2.67 2.55 2.43 2.33 2.24 2.15
57 6.33 5.70 5.18 4.75 4.39 4.07 3.80 3.56 3.35 3.17 3.00 2.85 2.71 2.59 2.48 2.38 2.28 2.19
58 6.44 5.80 5.27 4.83 4.46 4.14 3.87 3.63 3.41 3.22 3.05 2.90 2.76 2.64 2.52 2.42 2.32 2.23
59 6.56 5.90 5.36 4.92 4.54 4.21 3.93 3.69 3.47 3.28 3.11 2.95 2.81 2.68 2.57 2.46 2.36 2.27
60 6.67 6.00 5.46 5.00 4.62 4.29 4.00 3.75 3.53 3.33 3.16 3.00 2.86 2.73 2.61 2.50 2.40 2.31
68 7.56 6.80 6.18 5.67 5.23 4.86 4.53 4.25 4.00 3.78 3.58 3.40 3.24 3.09 2.96 2.83 2.72 2.62
70 7.78 7.00 6.36 5.83 5.39 5.00 4.67 4.38 4.12 3.89 3.68 3.50 3.33 3.18 3.04 2.92 2.80 2.69
72 8.00 7.20 6.55 6.00 5.54 5.14 4.80 4.50 4.24 4.00 3.79 3.60 3.43 3.27 3.13 3.00 2.88 2.77
76 8.44 7.60 6.91 6.33 5.85 5.43 5.07 4.75 4.47 4.22 4.00 3.80 3.62 3.45 3.30 3.17 3.04 2.92
80 8.89 8.00 7.27 6.67 6.15 5.71 5.33 5.00 4.71 4.44 4.21 4.00 3.81 3.64 3.48 3.33 3.20 3.08
84 9.33 8.40 7.64 7.00 6.46 6.00 5.60 5.25 4.94 4.67 4.42 4.20 4.00 3.82 3.65 3.50 3.36 3.23
95 10.56 9.50 8.64 7.92 7.31 6.79 6.33 5.94 5.59 5.28 5.00 4.75 4.52 4.32 4.13 3.96 3.80 3.65
96 10.67 9.60 8.73 8.00 7.38 6.86 6.40 6.00 5.65 5.33 5.05 4.80 4.57 4.36 4.17 4.00 3.84 3.69
102 11.33 10.20 9.27 8.50 7.85 7.29 6.80 6.38 6.00 5.67 5.37 5.10 4.86 4.64 4.43 4.25 4.08 3.92
112 12.44 11.20 10.18 9.33 8.62 8.00 7.47 7.00 6.59 6.22 5.89 5.60 5.33 5.09 4.87 4.67 4.48 4.31
Note:
Bigger number = Shorter Gearing = Higher RPM's
Smaller number = Taller Gearing = Lower RPM's

A 'Shorter' Gear Ratio is better for more torque, acceleration, wheelies, and racetracks with short straights.

A 'Taller' Gear Ratio is better for open-rode cruising, lower rpm's, better gas mileage, and tracks with long straights.

AURORA
XRR Freak

Joined: 2008-12-09

Posts: 689
Location: PHOENIX
XR650R Year: 2003

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Re: rear sprocket

Post  AURORA on Wed May 09, 2012 2:03 am

dougyfresh wrote:hi,my xrr has a 13t front and a 45t rear, as i bought it, have been told this works out same as stock
happy with the bike as is, it came with spare 48t, was wondering what difference this would make, with the 13t on front
any help would be great....

Great for wheelies.

AURORA
XRR Freak

Joined: 2008-12-09

Posts: 689
Location: PHOENIX
XR650R Year: 2003

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