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Input Shaft Assembly 23-21-15
-10 teeth, 4-speed/PK, DRT
"short 4th gear", for Vespa
50 S 3°/Special V5B3T (A)/(N)
/PK50 SS/XLS/Ape 50
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. DRT 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. DRT 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.
DRT input shaft assemblies are made of a tougher than standard grade of steel and then hardened through tempering. They are therefore extremely durable and so offer an ideal extension to the vast range of existing gear box components available. The gear ratios are much easier to adjust to the particular motor characteristics required. Most of the input shaft assemblies are equipped with a fine M11 grade thread and the nut to fit is also included.
Conclusion: These DRT 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.
You can choose from the following DRT input shaft assemblies:
The input shaft assembly that enables a shorter 4th gear ratio without having to change the output shaft gear cogs, also available for the APE three wheeler. An ideal basis for all gear box ratio experimentation projects. Simple and effective.
The DRT input shaft assembly with Z 23-21-15-10 cog teeth is the shorter 4th gear ratio for all ?non-italian? Smallframe models and for the APE three wheeler from TL1 8884->. We name the ?non-italian? Smallframe models Vespa 50 S 3°/Special V5B3T (A)/(N)/PK50 SS/XLS, DRT name them PK50 Belgium/Switzerland/France. The input shaft respectively is suitable for all VESPA models either 20 or 21 cog teeth on the 3rd gear cog and 25 or 26 teeth on the 4th gear cog.
Perfect with the orginal APE gears Z43/42-49-54-59.
OEM Numbers (for the purpose of comparison)
Cluster APE4 z23 0205 (4 corta) (DRT)
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