| |
RD905 |
RD906
|
| Number of speeds: |
5 forwards,
1 reverse |
6 forwards,
1 reverse |
| Gear positions: |
R-0-1-2-3-4-5 |
R-0-1-2-3-4-5-6 |
| Recommended max engine torque: |
|
| Weight: |
30 kg |
35 kg |
| Housing design: |
A symmetric design ensures thermal stability and a uniform deflection of the housing during high loads. A natural and favourable load path is designed into the whole layout.
All parts are machined from high tensile air craft quality aluminium. No castings are used whatsoever. |
| Clutch shaft: |
A separate clutch shaft drives the input shaft via a splined coupling. Different lengths and spline configurations are possible. The standard Ford 1”-23 spline is preferred for a shorter lead time, while we certainly can make any type of spline to any type of clutch. |
| Clutch release mechanism: |
Not integrated with the gearbox. Usually fitted in the standard bellhousing. |
| Clutch rings (dogrings): |
Tractive standard with 90 mm O.D. with radiused corners for long lifge and good durability. |
| Gear selection mechanism: |
Sequential shift mechanism extensivley developed by Tractive from Honda MX-bike origins. |
| Cockpit Gear Lever: |
Tractive sequential shift gear lever with return springs. |
| Connection between gear Lever and gearbox: |
Through 8 mm stanless steel rods, either direct or over a bell crank on the prop-shaft tunnel. |
| Reverse gear engagement: |
With clutch ring shared with 1:st gear. Note! No sliding gears, no chips or swarf in the gearbox. |
| Reverse gear release mechanism: |
A separate lever on the gear lever must be operated to release engagement of reverse gear. |
| Gear wheel width: |
17 mm for all gears. |
| Ratios: |
See Ratio charts |
| Drop Gears: |
The RD905 and RD906 gearbox have a drop gear arrangement to compensate for various rear axle ratios, or to fine tune the top speed and acceleration characteristics. Two gear situated behind a cover at the rear of the gearbox are easily replaced to alter the overall ratio of the gearbox. 13 different drop gears are currently in production. |
| Gear selection mechanism: |
Sequential shift mechanism extensivley developed by Tractive from Honda MX-bike origins. |
| Bearings: |
Standard type SKF cylindrical roller bearings for input and output shafts. Ball bearings for selector drums. |
| Bearings in clutch gears: |
INA cage type needle roller bearings. |
| Lubrication |
Wet sump. A GL5 spec. transmission oil is recommended. |
| Seals: |
Nitril as standard or Vition alternatively PTFE-lipped low friction seals on request. |
| Shot peening: |
All gears and dogrings are shot peened unless otherwise specified by the customer. The cost for shotpeening is included in the quoted price. |
| Surface treatment of casing: |
All parts making up the casing are anodized in black colour. |