High-end clutches from DRT for high-performance Vespa Smallframe engines. More friction surface, precision CNC-machined components, and a variety of sport and race versions for custom setups.
The stock Smallframe clutch quickly reaches its limits when used with tuned engines. While additional friction plates do provide more friction surface, the release travel in many designs is no longer sufficient to allow the Clutch to disengage cleanly. DRT has therefore systematically refined the classic V50/PV Clutch and optimized the individual components for higher engine power outputs.
- 4- to 6-washer versions for different power ranges
- CNC-machined base and front plates
- Integrated lead management for precise seating of the Clutch Springs
- SPORT and RACE versions for street and race engines
More friction surface and clean disengagement
Additional Clutch Friction Plates provide significantly more friction surface to transmit the torque of high-performance small-frame engines. At the same time, the design is engineered to ensure sufficient release travel so that the Clutch disengages reliably despite the additional Washer plates.
The design is based on the proven V50/PV model. However, DRT has redesigned virtually all components: a concavely curved, CNC-milled Outer Friction Plate Clutch, a solid Clutch Baseplate with integrated Spring Lead Management, as well as specially manufactured separation plates, springs, and a hardened Cluster Circlip.
DRT SPORT
The SPORT version features a sturdy Clutch Basket with precise lead management to ensure the Clutch Springs sit securely. Depending on the version, four cork linings with a thickness of 1.9 or 2.5 mm are inserted. In addition, three DRT separation discs are employed.
The DRT SPORT clutch is equipped with four cork linings. Versions with 2.5-mm linings require additional installation space on the Clutch Cover.
A DRT SPORT clutch without linings is also available, allowing for a custom configuration of the lining package.
DRT RACE
The RACE version is designed for even more powerful engines. Depending on the variant, four cork Clutch Friction Plates or five to six sintered Clutch Friction Plates are available. In addition, the corresponding DRT RACE Clutch Basket is inserted.
This allows the Clutch to be precisely tuned to engine performance, intended use, and desired disengagement characteristics.
Technical Details
- Base: Vespa V50/PV Clutch
- CNC-milled Clutch Baseplate
- Integrated spring guides
- CNC-machined, concave Outer Friction Plate Clutch
- Custom-manufactured separator discs
- Hardened Cluster Circlip
- Clutch Basket with precise Spring Attachment
- SPORT versions with cork linings
- RACE versions with cork or sintered linings, depending on the model
- Various spring and lining combinations available
Conclusion: A consistently refined small-frame clutch for high-performance engines that can be customized to a high degree through various combinations of linings, springs, and plates.
These products are a perfect fit – SIP TIPS:
- Don’t forgetthe ball-bearing-mounted PIAGGIO PK XL2 Pressure Plate .
- For the clutch without plates, we recommend four 2.5-mm V50/PV plates with three 1.2-mm spacer discs. For engines in the range of approximately 15–25 PS, the optimal combination of plates and spacer discs may vary depending on the setup. For higher power outputs, stronger Clutch Springs are also available.
Feedback
“Top-notch Clutch. Highly recommended.”
–SIP user “Chiemgauvespa”
Note: The current version of the DRT Race Clutch is designed for 10 Springs. However, only 8 Springs are included in the package.
