FastCounter by bCentral

    This Chart gives over-all gear ratios (in 4th gear) for all 1936-* 4 speed big twin transmissions. "Motor-Trans" are engine & countershaft sprocket tooth counts, respectively. Assumptions made are: rear tire diameter: 26", std. clutch drum: 37 tooth, std. rear sprocket: 51 tooth.

Motor-Trans

Ratio

RPM @ 60 MPH

Motor-Trans

Ratio

RPM @ 60 MPH

20-20

4.718-1

3660

21-20

4.493-1

3485

20-21

4.493

3485

21-21

4.279

3319

20-22

4.289

3327

21-22

4.084

3168

20-23

4.102

3182

21-23

3.907

3030

20-24

3.931

3049

21-24

3.744

2904

20-25

3.774

2927

21-25

3.594

2788

20-26

3.629

2815

21-26

3.456

2681

Motor-Trans

Ratio

RPM @ 60 MPH

Motor-Trans

Ratio

RPM @ 60 MPH

22-20

4.289-1

3327

23-20

4.102-1

3182

22-21

4.084

3168

23-21

3.907

3030

22-22

3.899

3024

23-22

3.729

2893

22-23

3.729

2893

23-23

3.567

2767

22-24

3.574

2772

23-24

3.418

2651

22-25

3.431

2661

23-25

3.282

2546

22-26

3.299

2559

23-26

3.156

2448

Motor-Trans

Ratio

RPM @ 60 MPH

Motor-Trans

Ratio

RPM @ 60 MPH

24-20

3.931-1

3049

25-20

3.774-1

2927

24-21

3.744

2904

25-21

3.594

2788

24-22

3.574

2772

25-22

3.431

2661

24-23

3.418

2651

25-23

3.282

2546

24-24

3.276

2541

25-24

3.145

2440

24-25

3.145

2440

25-25

3.019

2342

24-26

3.024

2346

25-26

2.903

2252

See these other Victory Library booklets

"Harley-Davidson" name for reference purposes only. Not affiliated with Harley-Davidson Motor Co.

 I'm trying to locate some people I used to know; please click here for more details. Thanks! 

Top of
Page

PANIC's
Mopar Tech

Victory Library
Books

Victory Book
Order Forms

Victory
Main Menu

Victory
Parts

Author’s
Biography