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Alfa Gearbox Ratio Chart

W/5.12 Diff Ratio W/4.56 Diff Ratio

Standard 5-Speed

Gear

Main Cluster Ratio Ratio MPH/K Ratio MPH/K

IV

23

30

1.00

0.79

5.12

14.90

4.56

16.70

III

27

26

1.35

0.74

6.94

11.00

6.18

12.33

II

32

21

1.99

0.68

10.18

7.50

9.06

8.40

I

38

15

3.30

0.60

16.92

4.51

15.07

5.05

V

20

33

0.79

4.05

18.85

3.60

21.13

Standard 4-Speed

Gear

Main

Cluster

Ratio

Ratio MPH/K Ratio MPH/K

IV

22

31

1.00

5.12

14.90

4.56

16.70

III

26

27

1.36

0.74

6.95

10.98

6.19

12.31

II

31

22

1.99

0.68

10.17

7.50

9.05

8.41

I

37

16

3.26

0.61

16.68

4.57

14.86

5.13

V

x

x

         

Close Ratio Race

Gear

Main

Cluster

Ratio

Ratio MPH/K Ratio MPH/K

IV

23

30

1.00

0.86

5.12

14.90

4.56

16.70

III

26

27

1.26

0.80

6.43

11.86

5.73

13.30

II

30

23

1.70

0.74

8.71

8.76

7.76

9.82

I

35

18

2.54

0.67

12.99

5.87

11.57

6.58

V

21

32

0.86

4.38

17.41

3.90

19.51

Close Ratio Race 2

Gear

Main

Cluster

Ratio

Ratio MPH/K Ratio MPH/K

IV

23

30

1.00

0.88

5.12

14.90

4.56

16.70

III

25

27

1.21

0.83

6.18

12.34

5.51

13.83

II

29

23

1.64

0.73

8.42

9.06

7.50

10.15

I

34

18

2.46

0.67

12.61

6.05

11.23

6.78

V

21

31

0.88

4.52

16.86

4.03

18.90

IV/III - 5-speed in 4-speed box

Gear

Main

Cluster

Ratio

Ratio MPH/K Ratio MPH/K

IV

23

30

1.00

5.12

14.90

4.56

16.70

III

27

26

1.35

0.74

6.94

11.00

6.18

12.33

II

31

22

1.84

0.74

9.41

8.11

8.38

9.09

I

37

16

3.02

0.61

15.44

4.94

13.75

5.54

V

x

x

         

IV/III - 4-speed in 5-speed box

Gear

Main

Cluster

Ratio

Ratio MPH/K Ratio MPH/K

IV

22

31

1.00

0.85

5.12

14.90

4.56

16.70

III

26

27

1.36

0.74

6.95

10.98

6.19

12.31

II

32

21

2.15

0.63

10.99

6.94

9.79

7.78

I

38

15

3.57

0.60

18.28

4.17

16.28

4.68

V

20

33

0.85

4.37

17.45

3.89

19.56



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