11t pinion 2.38mm shaft

Belt drive with the precision demanded by Raid and Rally competition

The 11-tooth toothed pulley with reference PSP-11D238 is designed for belt drive systems in slot cars with chassis specifically for Raid and Rally. Made from lightweight aluminium in a single piece and finished in green, it offers a combination of robustness and low weight that is crucial in categories where every gram counts.

Technical specifications

• Number of teeth: 11z
• Compatible axle diameter: 3/32" (2.38 mm)
• Belt compatibility: MXL
• Material: Lightweight aluminium
• Construction: Single piece (no assemblies or inserts)
• Colour: Green

Function and performance

In Raid and Rally chassis, belt drive is the preferred solution over direct drive via crown gear and pinion, thanks to its smoothness, reduced vibrations, and ability to absorb small impacts without transferring them to the motor. This 11-tooth pulley acts as the driving or driven pinion within that system, determining, along with the complementary pulley, the final gear ratio of the car.

Being machined from a single piece of lightweight aluminium, it avoids the play or deformation that occurs in assembled parts. The result is a cleaner transmission, with less torque loss and greater durability throughout competition sessions.

Compatibility

This pulley is designed for 3/32" (2.38 mm) axles, the most common standard in competition Raid and Rally chassis at 1/32 scale. For the transmission to function correctly, it must be combined with an MXL type belt and a complementary pulley with the same tooth profile.

Installation and preparation

Installation is direct onto the 2.38 mm axle. We recommend checking the fit before permanently securing the pulley, ensuring that there is no radial play that could translate into a loss of precision during operation. The fastening is usually done with a lateral tightening screw; it is advisable to apply a minimal amount of low-strength thread lock to prevent loosening without compromising disassembly for ratio adjustments.

Once installed, check the tension of the MXL belt: it should be neither excessively loose —which would cause tooth skipping— nor too tight, which would increase friction and wear on both the belt and the axle bearings.

Common mistakes

• Combining this pulley with belts of a different profile than MXL: the teeth will not mesh correctly, and the belt will end up skipping or wearing out prematurely.
• Installing it on axles with a diameter other than 2.38 mm without the appropriate adapter, which creates play and loss of concentricity.
• Neglecting the alignment between the driving pulley and the driven pulley: any lateral deviation causes asymmetric wear on the belt and additional noise.

Ideal for…

Preparers and drivers competing in Raid and Rally categories at slot scale, who are looking for a reliable, lightweight, and easy-to-install transmission part. It is also useful for those building or modifying their own chassis with MXL belt drive systems and needing a proven reference pulley.

Frequently asked questions

What belts is this pulley compatible with?

Exclusively with belts of the MXL profile. It is important not to mix profiles, as each type of toothed belt has a specific pitch and tooth geometry.

Can I use it on 2 mm or 3 mm axles?

Not directly. This pulley is calibrated for 3/32" (2.38 mm) axles. For other axle diameters, there are specific references with the corresponding hole.

Is it sold with a fastening screw included?

The available information does not specify whether it includes a screw. We recommend checking with our team before placing the order if you need confirmation.

How many teeth should the complementary pulley have to achieve a 1:1 ratio?

For a 1:1 gear ratio, you need another 11-tooth pulley of the same MXL profile. If you want to multiply or reduce speed, simply vary the number of teeth on the complementary pulley.

Is it suitable for official competition or just for recreational use?

Being made from lightweight aluminium in a single piece, it is clearly aimed at competition. Its validity in a specific regulation will depend on the rules of each championship or club.

The PSP-11D238 is an 11-tooth MXL pulley for 3/32" (2.38 mm) axles, machined from a single piece of lightweight aluminium. Designed for slot car Raid and Rally chassis with belt drive systems, it delivers clean, vibration-free power transmission. Compatible with MXL belts, green anodised finish, ideal for 1/32 scale competition preparation and custom chassis builds.