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Lambretta 125 LD  
Did you know?
It took until 1954 when Innocenti had a model that went over the 100.000 items produced. This was the popular Lambretta 150LD Series 2		  


Gears detailed model info

Li125 series 1,2 and early series 3 gearbox info

all of these gearboxes use the primary drive ratio of 15/46.

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

9

51

17.40 

2

12

42

10.71 

3

16

39

7.47 

4

19

35

5.65 

 

Li150 series 1, 2 and 3 gearbox info

all of these gearboxes use the primary drive ratio of 15/46.

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

11

50

13.95 

2

14

41

9.00 

3

17

37

6.67 

4

20

34

5.22 

 

series 2 Li150 rallymaster gearbox info

this gearbox uses the primary drive ratio of 15/46.

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

13

47

11.09 

2

15

39

7.97 

3

19

36

5.81 

4

22

32

4.46 

 

TV175 series 2 and 3, SX200 gearbox info

these gearboxes use the primary drive ratio of 15/46.

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

12

49

12.52 

2

14

40

8.76 

3

18

37

6.30 

4

21

33

4.82 

 

Li150 special, Pacemaker and late series 3 gearbox info

all of these gearboxes use the primary drive ratio of 15/46.

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

11

50

13.95 

2

13

41

9.67 

3

17

39

7.04 

4

19

35

5.65 

 

GP125 and Li125 special gearbox info.

this gearbox uses the primary drive ratio of 15/46.
The loose gears and group teeth are the same as GP200

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

10

50

15.33 

2

12

42

10.71 

3

15

39

7.97 

4

18

36

6.32 

 

SX150 and GP150 gearbox info

these gearboxes use the primary drive ratio of 15/46.

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

10

50

15.33 

2

12

42

10.71 

3

15

39

7.97 

4

19

35

5.65 

 

TV/GT200 gearbox info

This gearboxes uses the primary drive ratio of 15/46.

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

13

47

11.09 

2

15

39

7.97 

3

19

36

5.81 

4

22

32

4.46 

 

GP200 gearbox info

This gearbox uses the primary drive ratio of 18/47.
The loose gears and group teeth are the same as GP125

 gear 
no.

 group 
teeth

 loose 
gear

 overall 
ratio

1

10

50

13.05 

2

12

42

9.13 

3

15

39

6.79 

4

18

36

5.22 

 

Note that also some special aftermarket parts exist like the Imola 5 speed gearbox.