92d toothed belt

Clean and precise transmission with the 92D timing belt for MXL pitch

The timing belt is one of the most valued transmission systems in slot car preparation, especially in setups where the aim is to reduce noise, smooth out power delivery, and eliminate the mechanical play typical of conventional crown gear and pinion systems. This 92-tooth belt with MXL pitch, 1.8 mm thick, meets those exact needs.

Main features

• Number of teeth: 92
• Pitch: MXL (Miniature Extra Light), one of the most widespread standards in precision transmissions for slot cars
• Thickness: 1.8 mm
• Reference: PSP-BD92MXL

Function and performance

MXL pitch timing belts offer slip-free transmission between the motor and the rear axle. Being toothed, the grip is positive: there is no loss of synchronisation or slipping under load, resulting in a linear and predictable response in acceleration and braking. Compared to pinion and crown gear systems, belts operate with less friction, generate less heat, and are considerably quieter on track.

The thickness of 1.8 mm places it within the usual range for competitive slot applications, providing sufficient rigidity to transmit the motor's torque while maintaining the necessary flexibility to keep the correct tension in the pulley system.

Compatibility and installation

This belt is compatible with belt-driven transmission systems using MXL pitch pulleys. It is essential to verify that both the driving pulley (attached to the motor shaft) and the driven pulley (on the rear axle) are of the same MXL pitch and that the centre distance between the axles corresponds to the development of a 92-tooth belt. A correct tension adjustment—without slack or excessive tension—is key to prolonging the belt's lifespan and avoiding vibrations.

Installation and preparation

When installing the belt, it is advisable to carefully align both pulleys in the same lateral plane to avoid uneven wear or the belt coming off during operation. If the chassis allows for axle distance adjustment, always start from a position that allows for easy belt installation and then adjust until achieving a tension that allows for slight flex without becoming loose. Avoid over-tensioning: this would overload the bearings of the motor and rear axle.

Common mistakes

• Mixing pulleys of different pitches (e.g., MXL with XL): the teeth do not mesh correctly, and the belt jumps or gets damaged quickly.
• Not checking the lateral alignment of the pulleys before running: this causes asymmetric wear and increases the risk of the belt coming off.
• Over-tensioning thinking it will reduce slack: the effect is the opposite of what is desired, increasing friction and premature wear.

Frequently asked questions

What does MXL pitch mean in a timing belt?

MXL (Miniature Extra Light) is a standard designation for tooth profile in small pitch synchronous belts. It defines the shape and spacing between teeth, so it is essential that the pulley has exactly the same pitch for proper meshing.

How do I know if this 92-tooth belt fits my chassis?

You need to know the centre distance between the motor and rear axles of your chassis and verify that this distance corresponds to the development of a 92-tooth belt in MXL pitch. If your chassis manufacturer specifies the number of teeth for the belt, ensure it matches 92D.

When should I change the belt?

When symptoms such as unusual vibration, tooth noise, visible slack even when tension is correct, or if worn, broken, or deformed teeth are observed upon inspection. In intensive competition use, many preparers routinely check it after several sessions.

Can I use this belt with any slot motor?

The motor itself does not condition the belt: what matters is the diameter and pitch of the pulley mounted on its shaft. As long as the driving pulley is of MXL pitch and the number of teeth on the belt matches the axle distance, the belt will function correctly regardless of the installed motor.

The PSP-BD92MXL is a 92-tooth MXL pitch timing belt, 1.8 mm wide, designed for belt-drive transmission systems in slot cars. Compatible with MXL pulleys, it delivers smooth, low-noise power transfer from motor to rear axle. An essential spare part for slot car preparation and competition setups requiring precise, backlash-free drive. Available at Ministry of Hobby.