Chart 1: Wheel Gear to Swivel Gear Ratio
Chart 2: Swivel Gear Teeth to Wheel Gear Teeth Calculator
Chart 3: Tire Sizes
Chart 4: Drive Shaft Drive Combinations
Chart 5: Drive Shaft Driven Gear Combinations
Chart 6: Corbin Motorcycle Gear Ratio to Tire Size
Chart 7: Corbin Motorcycle Application
Chart 8: Kilometers to Miles Conversion

Chart 1: Wheel Gear to Swivel Gear Ratio
    
                                
  
            
 Wheel
GearTeeth:
56
60
64
68
72
74
 
  
 
 Swivel
GearTeeth:
16
16
16
16
16
16
 
    
    
Tire
 Diameter:
28
30
32
34
36
40
 
   
    
 
Tire Circ.:
87.96
94.25
100.53
106.81
113.10
124.66
 
    
     
  
R/Mi:
720.29
672.27
630.25
593.18
560.23
504.20
 
   
    
  
Swivel
 Ratio:
3.50
3.75
4.00
4.25
4.50
4.63
BRAND
MODEL
RPMi
RATIO
 
2521.01
2521.01
2521.01
2521.01
2521.01
2331.94
STEWART pre 1911
11, 24, 26
2521
1 to 1
1
3.50
3.75
4.00
4.25
4.50
5.00
STEWART 1811 & up
11, 24, 26
1009
2.5 to 1
2.5
3.50
3.75
4.00
4.25
4.50
5.00
JONES
100, 102
2521
1 to 1
1
3.50
3.75
4.00
4.25
4.50
5.00
STANDARD
 
1680
1 to 1
1
2.33
2.50
2.67
2.83
3.00
3.33
CORBIN
 
2521
1 to 1
1
3.50
3.75
4.00
4.25
4.50
5.00
WARNER
COKEBOTTLE
850
2 to 1
2
2.36
2.53
2.70
2.87
3.03
3.37
WARNER
COKEBOTTLE
1340
1 to 1
1
1.86
1.99
2.13
2.26
2.39
2.66
WARNER
 
680
2 to 1
2
1.89
2.02
2.16
2.29
2.43
2.70
WALTHAM
 
1009
2.5 to 1
2.5
3.50
3.75
4.00
4.25
4.50
5.00
AUTOMETER
 
680
2 to 1
2
1.89
2.02
2.16
2.29
2.43
2.70
AUTOMETER
 
680
2.5 to 1
2.5
2.36
2.53
2.70
2.87
3.03
3.37
EVERREADY
 
2210
1 to 1
1
3.07
3.29
3.51
3.73
3.94
4.38
FORD SPECIAL (all)
 
2000
1 to 1
1
2.78
2.97
3.17
3.37
3.57
3.97
AC
 
1000
 
1
1.39
1.49
1.59
1.69
1.78
1.98
VAN SICKLEN
 
1554
   
1
2.16
2.31
2.47
2.62
2.77
3.08
VAN SICKLEN
 
1000
 
1
1.39
1.49
1.59
1.69
1.78
1.98
SEARS CROSS
 
 
 
1
0.00
0.00
0.00
0.00
0.00
0.00
SMITH'S
 
3335
 
1
4.63
4.96
5.29
5.62
5.95
6.61
SPRINGFIELD
 
2750
1 to 1
1
3.82
4.09
4.36
4.64
4.91
4.96
HOFFECKER
 
2500
1 to 1
1
3.47
3.72
3.97
4.21
4.46
4.96
LEA
 
2150
1 to 1
1
2.89
3.20
3.41
3.62
3.84
4.26
L'EXACT
(1230/Km)
1980
 
1
2.75
2.95
3.14
3.34
3.53
3.93


     

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Chart 2: Swivel Gear Teeth to Wheel Gear Teeth Calculator
top Wheel gear teeth 35-99
 

 

Chart 3: Tire Sizes top
Tire sizes in Centimeters   

Inches

28

30

32

33

34

35

36

mm

711

762

813

838

864

889

914

Chart 4: Drive Shaft Drive Combinations top

N Number of tire rev./mi.

593
r wheel radius

17

R Rear Axel Ratio

4.25
T Number of teeth in drive shaft mounted gear

60

t Number of teeth in pinion (fiber) gear  
S Ration of Swivel Joint

6

K Contant of revolutions of Speedometer at 60 MPH

1009
     
N= 5280   =   10080   =   593  
    2Pi(r)                                                                           
                                                                          240 ratio  
S= NRT         T= KS        T= KSt        t= TNR       = 25 teeth  
  Kt                 NR             NR             KS    

Chart 5: Drive Shaft Driven Gear Combinations top

Drive Shaft Gear 

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

15 

2.667

2.733

2.8

2.867

2.933

3

3.067

3.133

3.2

3.267

3.333

3.4

3.467

3.533

3.6

16 

2.5

2.563

2.625

2.688

2.75

2.813

2.875

2.938

3

3.063

3.125

3.188

3.25

3.313

3.375

17 

2.353

2.412

2.471

2.529

2.588

2.647

2.706

2.765

2.824

2.882

2.941

3

3.059

3.118

3.176

18 

2.222

2.278

2.333

2.389

2.444

2.5

2.556

2.611

2.667

2.722

2.778

2.833

2.889

2.944

3

19 

2.105

2.158

2.211

2.263

2.316

2.368

2.421

2.474

2.526

2.579

2.632

2.684

2.737

2.789

2.842

20 

2

2.05

2.1

2.15

2.2

2.25

2.3

2.35

2.4

2.45

2.5

2.55

2.6

2.65

2.7

21 

1.905

1.953

2

2.048

2.095

2.143

2.191

2.238

2.286

2.333

2.381

2.429

2.476

2.524

2.571

22 

1.8182

1.864

1.909

1.955

2

2.0455

2.091

2.136

2.182

2.227

2.273

2.318

2.364

2.409

2.455

23 

1.739

1.783

1.826

1.870

1.913

1.957

2

2.043

2.087

2.130

2.174

2.217

2.261

2.304

2.348

Chart 6: Corbin Motorcycle Gear Ratio to Tire Size top

Gear Ratios  for various tire sizes.
       
Calculated
Tire
Wheel
Pinion
Ratio
26x2.75
85
27
3.148
26x5.27
92
29
3.172
 
 
 
 
26x3
64
19
3.368
26x3
72
22
3.273
26x3
82
25
3.280
26x3
85
26
3.269
26x3
92
28
3.286
 
 
 
 
27.3x3.5
64
19
3.368
27.3x3.5
72
21
3.429
27.3x3.5
82
24
3.417
27.3x3.5
85
25
3.400
27.3x3.5
92
27
3.407
 
 
 
 
28x3
64
18
3.556
28x3
72
20
3.600
28x3
82
23
3.565
28x3
85
24
3.542
28x3
92
26
3.538
 
  
 
 
29x3.5
82
22
3.727
29x3.5
85
23
3.696
29x3.5
92
25
3.680
     
 
 
Ballon
 
 
 
25x3.85
see 26x2.75
 
  
26x3.3
see 26x3
  
 
27x3.85
see 26x3
  
 
Chart 7: Corbin Motorcycle Application top
  
 
Head
Cable
Gear
Large
 
Bracket
Length (ins)
Bracket
Gear
ACE S-183-BX
34
S-179-BX
85
Cleveland 4 S-183-AX
32
S-285-X
85
Harley Twin S-287-EX
28.5
S-467-AX
92
Harley Single S-287-FX
28.5
S-467-BX
92
Henderson S-195-BX
24.75
S-179-BX
92
Indian Chief S-195-BX
34
S-285-X
85
Indian Scout S-195-BX
31
S-285-X
85
Indian Prince S-195-BX
31
S-285-X
85
Ner-a-Car S-243-X
48
S-285-X
85
Super-X S-195-X
27.75
S-179-BX
92

Chart 8: Kilometers to Miles Conversion top

       
1.60935
  
 
MPH
  
Kmph
  
KmPH
MPH
RPM
10
   
16.1
  
10
6.2
 
20
   
32.2
  
20
12.4
 
30
504
48.3
  
30
18.6
 
40
  
64.4
  
40
24.9
 
50
  
80.5
  
50
31.1
522
60
1009
96.6
  
60
37.3
 
70
    
112.7
  
70
43.5
 
80
    
128.7
  
80
49.7
 
90
    
144.8
  
90
55.9
 
100
    
160.9
  
100
62.1
1045
 
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