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Gear Chart & Bevel Twin Original Fitment Gearing Chart

Gear Chart - what do you have vs what do you want to do?
for more lower end, go LARGER on the rear or SMALLER on the front
for more top end, go SMALLER on the rear or LARGER on the front
  Front Sprocket # of teeth in RED across top
Rear sprocket # of teeth in BLUE on left
 It is BEST to have an ODD/EVEN combination
12 13 14 15 16 17
26 2.17 2.00 1.86 1.73 1.63 1.53
27 2.25 2.08 1.93 1.80 1.69 1.59
28 2.33 2.15 2.00 1.87 1.75 1.65
29 2.42 2.23 2.07 1.93 1.81 1.71
30 2.50 2.31 2.14 2.00 1.88 1.76
31 2.58 2.38 2.21 2.07 1.94 1.82
32 2.67 2.46 2.29 2.13 2.00 1.88
33 2.75 2.54 2.36 2.20 2.06 1.94
34 2.83 2.62 2.43 2.27 2.13 2.00
35 2.92 2.69 2.50 2.33 2.19 2.06
36 3.00 2.77 2.57 2.40 2.25 2.12
37 3.08 2.85 2.64 2.47 2.31 2.18
38 3.17 2.92 2.71 2.53 2.38 2.24
39 3.25 3.00 2.79 2.60 2.44 2.29
40 3.33 3.08 2.86 2.67 2.50 2.35
41 3.42 3.15 2.93 2.73 2.56 2.41
42 3.50 3.23 3.00 2.80 2.63 2.47
43 3.58 3.31 3.07 2.87 2.69 2.53
44 3.67 3.38 3.14 2.93 2.75 2.59
45 3.75 3.46 3.21 3.00 2.81 2.65
46 3.83 3.54 3.29 3.07 2.88 2.71
47 3.92 3.62 3.36 3.13 2.94 2.76
48 4.00 3.69 3.43 3.20 3.00 2.82
49 4.08 3.77 3.50 3.27 3.06 2.88
50 4.17 3.85 3.57 3.33 3.13 2.94
51 4.25 3.92 3.64 3.40 3.19 3.00
52 4.33 4.00 3.71 3.47 3.25 3.06
53 4.42 4.08 3.79 3.53 3.31 3.12
54 4.50 4.15 3.86 3.60 3.38 3.18

Stock Gearing Setups for Bevel Drive Ducati Bikes
Source:  Ian Falloon, Ducati Twins Restoration Guide - Bevel Drive  1971-85

1971-74         750 GT/Sport                       16/36
1974-75         750 Super Sport                   16/40
1976-79         750 Super Sport                   15/38
1974-77         860 GT/GTE                         16/40
1975-79         860/900 GTS                        15/38
1975              900 Super Sport                   16/40
1976-80          900 Super Sport       15/38, 15/36
1977-83          900 SD Darmah                   15/38
1979-81          900 SSD Darmah                  15/36
1979-80          900 MHR                             15/36
1981-82           900 Super Sport                 16/38    
1981-82          900 MHR                           15/33    
1982-84          900 S2                               15/33
1983-84          900 MHR                             15/33
1984-85          1000 MHR/S2                       15/41

 

Remember, it has been found that using ODD/ODD or EVEN/EVEN combinations of front and rear sprocket will cause your chain to wear faster than using an ODD/EVEN combination.  Oring chains are wider etc than the old school non oring chains.  I have found it difficult to install a 16 tooth front sprocket on early roundcases [sandcast engines] using an oring chain.

My favourite combination is a 16/39 on my Darmah.  However, I stock both 15 and 16 tooth front sprockets as well as 36, 37, 38 and 39 tooth rear sprockets in order to offer the widest combinations that are more useful today.  Remember, tall gearing was installed to keep the revvs down to help pass DOT noise restrictions etc...  I prefer to get a better jump off the line, this helps around town riding etc as you never want to lug the engine.


Above: "Titan tuff" aluminum sprocket and DID 530-120 ERV chain

    

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