Commando gear ratios using various boxes and sprockets and speeds per 1000 r.p.m.
|
The same AMC gearbox was used on all Commandos, the only change being that from 1974 onwards there was a small difference in the 2nd. gear ratio (not shown in m.p.h. tables). The overall gearing is also affected by the size of the final drive sprocket; usually 19, 20 or 21 teeth, occasionally 22. |
| Standard | RGM Close Ratio (with Kickstart) |
RGM Close Ratio (no Kickstart) |
Quaife Close Ratio (Road) |
Quaife Close Ratio (Racing) |
 |
 |
 |
 |
 |
| STANDARD - Ratios | ||||||||
| SPROCKETS | Engine 26 teeth |
Clutch 57 teeth |
Rear wheel 42 teeth |
Rear wheel size 19" x 4.10 81" circ. |
||||
| FINAL DRIVE | 19 TEETH | 20 TEETH | 21 TEETH | 22 TEETH | ||||
| GEAR | mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
| 1st. | 6.19 | 37 | 6.52 | 39 | 6.85 | 41 | 7.17 | 43 |
| 2nd. | 9.29 | 56 | 9.78 | 59 | 10.27 | 62 | 10.76 | 65 |
| 3rd. | 13.01 | 78 | 13.69 | 82 | 14.38 | 86 | 15.06 | 90 |
| 4th. | 15.83 | 95 | 16.66 | 100 | 17.49 | 105 | 18.33 | 110 |
| STANDARD - Teeth | ||||
| GEAR | 1st. | 2nd. | 3rd. | 4th. |
| Mainshaft | 14 | 18 | 21 | 23 |
| Layshaft | 28 | 24 | 20 | 18 |
| Ratio | 2.556 : 1 | 1.704 : 1 | 1.217 : 1 | 1.000 : 1 |
| Mainshaft 2nd. gear was 19 teeth from 1974 onwards; ratio 1.614 : 1 | ||||
| RGM CLOSE RATIO (Kickstart) - Ratios | ||||||||
| SPROCKETS | Engine 26 teeth |
Clutch 57 teeth |
Rear wheel 42 teeth |
Rear wheel size 19" x 4.10 81" circ. |
||||
| FINAL DRIVE | 19 TEETH | 20 TEETH | 21 TEETH | 22 TEETH | ||||
| GEAR | mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
| 1st. | 7.72 | 46 | 8.13 | 49 | 8.53 | 51 | 8.94 | 54 |
| 2nd. | 11.31 | 68 | 11.90 | 71 | 12.50 | 75 | 13.09 | 79 |
| 3rd. | 13.76 | 83 | 14.49 | 87 | 15.21 | 91 | 15.94 | 96 |
| 4th. | 15.83 | 95 | 16.66 | 100 | 17.49 | 105 | 18.33 | 110 |
| RGM CLOSE RATIO (Kickstart) - Teeth | ||||
| GEAR | 1st. | 2nd. | 3rd. | 4th. |
| Mainshaft | ||||
| Layshaft | ||||
| Ratio | 2.05 : 1 | 1.40 : 1 | 1.15 : 1 | 1.00 : 1 |
| RGM CLOSE RATIO (no Kickstart) - Ratios | ||||||||
| SPROCKETS | Engine 26 teeth |
Clutch 57 teeth |
Rear wheel 42 teeth |
Rear wheel size 19" x 4.10 81" circ. |
||||
| FINAL DRIVE | 19 TEETH | 20 TEETH | 21 TEETH | 22 TEETH | ||||
| GEAR | mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
| 1st. | 8.79 | 53 | 9.26 | 56 | 9.72 | 58 | 10.18 | 61 |
| 2nd. | 11.31 | 68 | 11.90 | 71 | 12.50 | 75 | 13.09 | 79 |
| 3rd. | 13.76 | 83 | 14.49 | 87 | 15.21 | 91 | 15.94 | 96 |
| 4th. | 15.83 | 95 | 16.66 | 100 | 17.49 | 105 | 18.33 | 110 |
| RGM CLOSE RATIO (no Kickstart) - Teeth | ||||
| GEAR | 1st. | 2nd. | 3rd. | 4th. |
| Mainshaft | ||||
| Layshaft | ||||
| Ratio | 1.80 : 1 | 1.40 : 1 | 1.15 : 1 | 1.00 : 1 |
| QUAIFE CLOSE RATIO (Road) - Ratios | ||||||||
| SPROCKETS | Engine 26 teeth |
Clutch 57 teeth |
Rear wheel 42 teeth |
Rear wheel size 19" x 4.10 81" circ. |
||||
| FINAL DRIVE | 19 TEETH | 20 TEETH | 21 TEETH | 22 TEETH | ||||
| GEAR | mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
| 1st. | 6.71 | 40 | 7.07 | 42 | 7.42 | 45 | 7.78 | 47 |
| 2nd. | 9.57 | 57 | 10.08 | 60 | 10.58 | 63 | 11.08 | 66 |
| 3rd. | 11.72 | 70 | 12.33 | 74 | 12.95 | 78 | 13.57 | 81 |
| 4th. | 14.31 | 86 | 15.07 | 90 | 15.82 | 95 | 16.57 | 99 |
| 5th. | 15.83 | 95 | 16.66 | 100 | 17.49 | 105 | 18.33 | 110 |
| QUAIFE CLOSE RATIO (Road) - Teeth | |||||
| GEAR | 1st. | 2nd. | 3rd. | 4th. | 5th. |
| Mainshaft | 14 | 17 | 19 | 21 | 22 |
| Layshaft | 27 | 23 | 21 | 19 | 18 |
| Ratio | 2.357 : 1 | 1.654 : 1 | 1.351 : 1 | 1.106 : 1 | 1.000 : 1 |
| QUAIFE CLOSE RATIO (Racing) - Ratios | ||||||||
| SPROCKETS | Engine 26 teeth |
Clutch 57 teeth |
Rear wheel 42 teeth |
Rear wheel size 19" x 4.10 81" circ. |
||||
| FINAL DRIVE | 19 TEETH | 20 TEETH | 21 TEETH | 22 TEETH | ||||
| GEAR | mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
mph per 1000 rpm |
mph @ 6000 rpm |
| 1st. | 7.97 | 48 | 8.39 | 50 | 8.81 | 53 | 9.23 | 55 |
| 2nd. | 9.57 | 57 | 10.08 | 60 | 10.58 | 63 | 11.08 | 66 |
| 3rd. | 11.72 | 70 | 12.33 | 74 | 12.95 | 78 | 13.57 | 81 |
| 4th. | 14.31 | 86 | 15.07 | 90 | 15.82 | 95 | 16.57 | 99 |
| 5th. | 15.83 | 95 | 16.66 | 100 | 17.49 | 105 | 18.33 | 110 |
| QUAIFE CLOSE RATIO (Racing) - Teeth | |||||
| GEAR | 1st. | 2nd. | 3rd. | 4th. | 5th. |
| Mainshaft | 16 | 17 | 19 | 21 | 22 |
| Layshaft | 26 | 23 | 21 | 19 | 18 |
| Ratio | 1.986 : 1 | 1.654 : 1 | 1.351 : 1 | 1.106 : 1 | 1.000 : 1 |
