Mitoos MXL z87 timing belt

The Mitoos MXL z87 belt (ref. CXM487): long-range transmission for 4x4 slot cars

When the wheelbase of a Slot Raid or Rally-Slot chassis exceeds the usual dimensions, the transmission belt becomes a critical component. The Mitoos CXM487 addresses this need with 87 teeth, standard MXL pitch, and 2 mm width, offering a longer length than the standard versions in the range to fit long chassis 4x4 configurations without compromise.

Function and performance

The toothed belt transmission system is the preferred option in 4x4 slot cars because it combines lightness, quiet operation, and precision. Unlike chain or driveshaft systems, the MXL belt transmits the motor's rotation to the axles with constant timing, no play, and minimal efficiency losses.

The CXM487, with its 87 teeth, is designed to accommodate the wheel spacing typical of long chassis used in Slot Raid competition. Its robust construction maintains stable tension throughout the entire rotation, eliminating the risk of tooth skipping under hard acceleration or impacts typical of jumps on dirt or off-road circuits.

Compatibility

This belt fits directly with Mitoos toothed pulleys of MXL pitch, both in plastic versions (ref. M136 to M140) and in competition-grade aluminium versions (ref. M143 to M149). The adjustment is micrometric, allowing for precise and repeatable belt tension tuning between sessions.

• Number of teeth: 87 (z87)
• Width: 2 mm
• Pitch: Standard MXL
• Application: Long-range transmission for 4x4 slot cars
• Compatible with: Mitoos MXL toothed pulleys (plastic and aluminium)

Installation and preparation

To maximise the performance of this belt, it is advisable to check the alignment of the pulleys before tensioning. A slight lateral misalignment can cause premature wear on the tooth flanks and may lead to vibrations that affect the car's stability. Ideally, the tension should be checked with the chassis in a running position: not too loose, which causes skipping, nor overly tight, which overloads bearings and reduces the belt's lifespan.

If the installation includes a high-torque motor, as is common in competition setups with hand-wound motors, it is recommended to check the belt after the first sessions to confirm that it has not developed play due to the initial settling of the assembly.

Common errors

• Mixing belts and pulleys of different pitches (MXL with HTD or others): the teeth do not fit correctly, leading to skipping under load.
• Reusing a belt with worn teeth or visible micro-cracks: in competition, failure during a race is almost guaranteed.
• Not cleaning the pulley grooves before installing the new belt: grease or dirt residues alter grip and accelerate wear.

Frequently asked questions

Is this belt specific to Slot Raid or can it be used in other 4x4 slot formats?

It is aimed at any long chassis configuration with 4x4 drive that uses MXL pitch pulleys. Slot Raid is its most common application, but it also fits Rally-Slot chassis or other disciplines that share that transmission system.

How do I know if I need the z87 or a belt with fewer teeth?

The number of teeth determines the total length of the belt. If the wheelbase of your chassis is greater than usual, you need a longer belt, such as the z87. The safest approach is to measure the distance between the centres of the pulleys and consult the Mitoos equivalence table.

How often should the belt be replaced?

It depends on the intensity of use and the power of the motor. In regular competition, it is advisable to visually inspect it in each session and replace it at the first sign of wear on the tooth flanks, deformation, or micro-cracks.

Is it compatible with pulleys from other brands that also use MXL pitch?

The MXL pitch is standardised, so in theory, it is compatible with any pulley of that same pitch. However, to ensure a micrometric fit and maximum reliability in competition, it is most advisable to use Mitoos toothed pulleys for which this belt is specifically designed.

Is it sold in a pack or as a single unit?

The reference CXM487 corresponds to a single belt.

The Mitoos CXM487 is an MXL-pitch synchronous belt featuring 87 teeth and a 2 mm width, designed for long-wheelbase 4x4 slot car drivetrains used in Slot Raid and Rally-Slot competition. It pairs precisely with Mitoos MXL pulleys (plastic ref. M136–M140 and aluminium ref. M143–M149), ensuring consistent tension, zero tooth skipping and efficient power transfer under hard acceleration. A must-have spare for 1/32 scale 4x4 slot car builders seeking reliable long-reach belt drive systems.