Mitoos MXL z70 timing belt

Slip-free transmission for Mitoos pulley systems

The Mitoos MXL z70 toothed belt (ref. CXM470) is the silent link that connects the motor and rear axle when you opt for a belt drive system in your slot car setup. With 70 teeth, 2 mm wide, and standard MXL pitch, it fits precisely with the entire range of toothed pulleys from the brand, both plastic and aluminium.

Technical specifications

• Number of teeth: 70
• Width: 2 mm
• Pitch: MXL (standard miniature pitch)
• Compatibility: Mitoos plastic toothed pulleys (refs. M136–M140) and aluminium (refs. M143–M149)

Function and performance

MXL pitch toothed belts are designed to transmit rotation at high speeds between two shafts without slipping. Unlike a crown and pinion drive, the belt absorbs small vibrations and operates more quietly, which is particularly useful in competition cars where mechanical noise can mask the true state of the motor-transmission assembly.

The 70-tooth adjustment determines the gear ratio along with the number of teeth on the driving and driven pulleys. Selecting the correct number of teeth on each pulley is as important as choosing the right belt: a well-calculated setup allows you to make the most of the motor's RPM range without sacrificing torque.

Compatibilities

This belt is exclusively compatible with the toothed pulleys from the Mitoos range. Before installation, ensure that the pulleys on the rear axle and motor correspond to the MXL pitch and 2 mm width. Attempting to combine belts and pulleys of different pitches (MXL, XL, L…) will result in poor meshing and premature wear.

Installation and preparation

For proper installation, ensure that the centre distance between the two shafts allows for tensioning the belt without forcing it. An excessively tight belt overloads the bearings; too loose produces tooth skipping during sudden load changes. Ideally, there should be a slight play that disappears with working tension. Periodically check the condition of the teeth: premature wear usually indicates incorrect alignment of the pulleys.

Frequently asked questions

Which Mitoos pulleys is this belt compatible with?

It is compatible with all toothed pulleys from the Mitoos range: the plastic ones with references M136 to M140 and the aluminium ones with references M143 to M149. In all cases, they must be MXL pitch and 2 mm wide.

Can I use this belt with pulleys from other brands?

As long as the pulley is MXL pitch and 2 mm wide, the belt should fit. However, Mitoos guarantees a perfect fit only with its own pulleys. If you combine with parts from other brands, check the measurements carefully before installation.

How do I know if I need a 70-tooth belt or a different number?

The number of teeth on the belt determines the centre distance between the two pulleys. For Mitoos systems, consult the assembly sheet of your chassis or the technical documentation from the brand to see which belt length corresponds to each pulley configuration.

When should the belt be replaced?

When visible wear on the teeth, cracks in the material, or loss of tension that cannot be corrected by adjusting the axle distance is observed. In intensive competition use, it is advisable to check it after each long running session.

The Mitoos MXL z70 toothed belt (CXM470) is a 70-tooth, 2 mm wide MXL-pitch drive belt for Mitoos pulley systems, compatible with both plastic (M136–M140) and aluminium (M143–M149) toothed pulleys. Designed for high-RPM slot car transmission setups, it delivers smooth, slip-free power transfer between motor and rear axle. A reliable choice for slot car builders looking for precise, low-noise belt drive solutions.