Mitoos MXL z77 timing belt

MXL Pitch Timing Belt for Your Mitoos Setup

The Mitoos MXL z77 toothed belt (ref. CXM477) is a standardised 77-tooth, 2 mm wide, MXL pitch belt designed for axle drive systems in competitive slot car setups. Its MXL profile ensures precise engagement with the toothed pulleys from the Mitoos range, preventing slippage that can occur with friction drives.

Features and Function

• 77 teeth of standardised MXL profile.
• 2 mm wide, standard dimension of the Mitoos belt range.
• MXL pitch: fine tooth design aimed at high rotational speeds with minimal play.
• Lossless traction transmission: the tooth engagement fits firmly into the pulley and maintains synchronisation between the motor and rear axle even at high RPMs.

Compatibility

This belt is designed to work with the entire range of Mitoos toothed pulleys:

• Plastic pulleys: references M136 to M140.
• Aluminium pulleys: references M143 to M149.

As a standardised MXL pitch belt, it may also be compatible with other MXL pulleys on the market that share the same pitch and width specifications. Always check the number of teeth and width before combining it with parts from other manufacturers.

Assembly and Preparation

Assembling a belt drive requires that the centre distance between both pulleys is adjusted precisely. A belt that is too tight can generate excessive friction and heating; too loose, it causes tooth skipping and power loss. With 77 teeth, this reference covers a specific axle distance: ensure that your chassis accommodates this development before ordering.

For assembly, it is recommended not to force the tooth engagement or use cutting tools near the belt, as any nick can compromise its integrity and cause breakage in competition.

Frequently Asked Questions

What is the difference between a z77 belt and a z73, for example?

The number following the "z" indicates the number of teeth on the belt. A higher number of teeth means a longer overall belt length and, therefore, a greater centre distance between pulleys. You must choose the reference that corresponds to the axle spacing of your chassis.

Can I use this belt with pulleys from other brands?

As it is a standardised MXL pitch, it may be compatible with pulleys from other brands that use the same pitch and 2 mm width. However, Mitoos guarantees a perfect fit only with its own range of pulleys (M136–M140 in plastic and M143–M149 in aluminium).

How often should the belt be replaced?

It depends on usage and the RPM at which the system operates. In competitive use with intense sessions, it is advisable to regularly inspect the belt for signs of wear on the teeth, cracks, or loss of tension. Having a spare unit in the racing kit is always a good idea.

Is belt drive better than pinion and crown gear drive?

They are different approaches. Toothed belt drive provides smooth operation and lower mechanical noise, as well as some vibration absorption. Direct gear drive is stiffer and more common in high-power setups. The choice depends on the category regulations and the preferences of the tuner.

The Mitoos MXL z77 toothed belt (ref. CXM477) is a 77-tooth, 2 mm wide, MXL pitch timing belt designed for slot car drive systems. It offers a precise fit with all Mitoos toothed pulleys — both plastic (M136–M140) and aluminium (M143–M149) — ensuring high-RPM power transmission without slippage. A reliable spare part for competitive slot car preparation and tuning.