Input Shaft Assembly 21-18-14-10 teeth CRIMAZ 4-speed/PK

Cristian Mazelli is a dedicated Vespa enthusiast and he has been most active on the Italian scooter racing scene for many years. During his time as a racer he was constantly faced with material and part quality problems he deemed as unsuitable for the task in hand. To ease these bottlenecks in supply he decided to use his career-based knowledge of industrial research and development to create parts under his own name that he now markets under the 'CRIMAZ' logo. Beautifully detailed solutions combined with very high production quality are the results!

Clean gear changes while you are accelerating can be decisive over defeat or victory. It is almost an art to be able to setup your gear ratios ideally to match the area of your rev range where maximum power is available (the power band). The VESPA gear box components have seen a lot of experimentation and development in recent years. CRIMAZ are at the forefront of this research and have suitable gear box parts available to suit most possible motor setups.

The problem of a clean gear change between 3rd and 4th gears, especially with performance enhanced motors, is shared between both the large and small frame VESPA motors. CRIMAZ offers new gear ratio setups with their range of input shaft assemblies. Maximum engine revolutions in 4th gear with a 150 kg load over a longer distance or race use of the 4th gear, everything is possible.

The gearbox components by CRIMAZ are produced to the highest standards and even their appearance betrays the quality of technical perfection involved in their development to deliver an optimal function. They are also capable of withstanding extreme strain and load, have a convincing longevity and durability and are an excellent complement to existing drive train parts. They allow noticeably closer gearing combinations with more flexibility to match individual motor characteristics.

Conclusion: These CRIMAZ input shaft assemblies are essential for all serious racers and sprinters. Rally going scooterists have also learnt the benefits of top quality adjustable gear box ratios.

SIP-TIP: If you want to raise the ratio of your gear box start with the primary drive gears. The input shaft upgrade is first, followed by the adjustment of the individual gear cogs on the output shaft. Never forget to order a new gear selector cruciform (at best the DRT item) and fresh gear box oil. Last but not least the SIP gear box shaft assembly spacers help you find the ideal output shaft assembly end float for safe and enduring use of your motor.

An input shaft with 20-17-14-10 toothed cogs. It is compatible with the first three original output shaft gears (58-54-50 toothed) but the 4th gear requires a 49 toothed item, which is included in the delivery. The ratio gap between 2nd and 3rd has been reduced, as well as the gap between 3rd and 4th which noticeably improves acceleration throughout the range of the gearbox. A strengthened M10x1 holding nut is included with the kit.

An input shaft with 21-18-14-10 toothed cogs. It is fully compatible with the original output shaft cogs (58-54-50-46 toothed). The ratio gap between 3rd and 4th gears is reduced and acceleration up through the gearbox is noticeably improved.