| Motorcycle Performance Guide Calculate Gear Ratios |
This program calculates the
gear ratios of a motorcycle. The primary drive ratio and overall ratios for each gear are
all calculated. Just enter the data in the white boxes below, then click the
"Calculate" Button. Pressing the "Reset" button loads the default
values into the form.
The reset values displayed are from a 1994 FXDL Harley-Davidson Dyna Low
Rider. All late model Harley Big Twin models have similar. The Rear Wheel Sprocket can
vary, with belt drive models using a 61, 65 or 70 tooth sprocket. Below is a table of
typical values for late model Harley-Davidson motorcycles.
Ratios listed for all 2007 model HD's are overall
ratios.
| Make Model |
Engine Sprocket |
Clutch Sprocket |
Trans Sprocket |
Rear Wheel Sprocket |
1st Gear |
2nd Gear |
3rd Gear |
4th Gear |
5th Gear |
6th
Gear |
HD
FLH
07-later |
34 |
46 |
32 |
66 |
9.312 |
6.421 |
4.774 |
3.926 |
3.279 |
2.790 |
HD
FXD
06-later |
34 |
46 |
32 |
66 |
9.312 |
6.421 |
4.774 |
3.926 |
3.279 |
2.790 |
HD
FLS models
07-later |
34 |
46 |
32 |
66 |
9.312 |
6.421 |
4.774 |
3.926 |
3.279 |
2.790 |
| 07-later Japanese |
34 |
46 |
32 |
64 |
9.030 |
6.226 |
4.630 |
3.807 |
3.179 |
2.706 |
| 2008 HD EVO 1200 Sportster |
38 |
57 |
|
|
9.315 |
6.653 |
4.948 |
4.102 |
3.517 |
|
| 2008 HD EVO 883 Sportster |
34 |
57 |
|
|
10.782 |
7.702 |
5.728 |
4.748 |
4.071 |
|
| HD FXDL Domestic |
24 |
37 |
32 |
70 |
3.24 |
2.21 |
1.60 |
1.23 |
1.00 |
|
| HD FXDL Export |
24 |
37 |
32 |
65 |
3.24 |
2.21 |
1.60 |
1.23 |
1.00 |
|
| HD FXDL Australia |
24 |
37 |
32 |
61 |
3.24 |
2.21 |
1.60 |
1.23 |
1.00 |
|
HD Drive Kit 40035-00
94-06 |
25
Upgrade |
37
OEM |
|
|
|
|
|
|
|
|
| 1996 HD EVO 883 Sportster |
35 |
56 |
27 |
61 |
2.687 |
1.97 |
1.434 |
1.79 |
1.00 |
|
| 1996 HD EVO 1200 Sportster |
35 |
56 |
29 |
61 |
2.687 |
1.97 |
1.434 |
1.79 |
1.00 |
|
|
| |
|
