Crown gear 36t. Sidewinder M50 for axle 2.38mm O18.5mm with M2.5 screw

The Scaleauto SC-1146R Crown Gear: Fine-Tuned Transmission for Sidewinder Mounts in 1/32

When the transmission fails, the rest of the preparation work loses all its meaning. The SC-1146R crown gear from Scaleauto is designed to provide a clean, quiet, and durable mesh in Sidewinder configurations —motor positioned parallel to the rear axle— within the 1/32 scale.

Features and Specifications

• Number of Teeth: 36
• Module: M50
• Outer Diameter: Ø18.5 mm
• Compatible Axle Diameter: 2.38 mm
• Fixing: M2.5 screw
• Motor Configuration: Sidewinder (motor parallel to the rear axle)
• Reference: SC-1146R
• Brand: Scaleauto

Function and Performance

In a Sidewinder mount, the crown gear works directly with the motor pinion to transmit power to the rear axle. A well-sized crown gear reduces vibrations, minimizes transmission noise, and extends the lifespan of both the pinion and the axle itself. With 36 teeth in M50 module, this reference offers a conservative gear ratio, suitable for technical tracks where controlled acceleration and constant traction make the difference over top speed.

Compatibility

This crown gear is designed for 2.38 mm diameter axles, a standard measurement in much of the competitive and prepared 1/32 slot mounts. The M2.5 fixing screw ensures a solid fit without the need for adhesives, facilitating quick changes during a tuning session. It is compatible with M50 pinions of the common modules available in the slot market.

If your chassis uses a different axle diameter, check before mounting: Scaleauto has equivalent crown gears for other axle diameters in its 1/32 spare parts catalogue.

Mounting and Preparation

• Before mounting, check that the axle has no burrs or deformations that could cause play.
• Insert the crown gear to the desired position and tighten the M2.5 screw with an appropriate screwdriver, without over-tightening to avoid damaging the axle.
• Check the lateral play with the pinion: there should be a slight backlash to prevent overheating and premature wear.
• A drop of specific slot transmission lubricant on the tooth flanks extends the life of the pinion-crown gear assembly.

Common Errors

• Mixing Modules: using a pinion of a different module than M50 results in poor meshing and accelerated wear. Always confirm that pinion and crown gear share the same module.
• Over-tightening the Screw: can deform the axle and cause imbalances that are clearly noticeable on track.
• Not Checking Alignment: a misaligned crown gear with respect to the pinion is a source of noise and power loss. Use a caliper or the chassis guide itself as a reference.

Frequently Asked Questions

Which pinions is this crown gear compatible with?

With any pinion of module M50. The number of teeth on the pinion will determine the final gear ratio, so choose based on the characteristics of your track and the power of your motor.

Is it valid for inline or anglewinder mounts?

No. This crown gear is specifically designed for Sidewinder configurations, where the motor is parallel to the rear axle. For inline or anglewinder mounts, there are specific references in the Scaleauto catalogue.

Can I use it on Sport track and also on Scalextric or Ninco?

The crown gear itself is independent of the track system. What determines compatibility is the chassis, axle, and motor of your car. Ensure that the axle diameter is 2.38 mm and that you are working with module M50.

What gear ratio does a 36-tooth crown gear provide?

It depends on the number of teeth of the pinion you combine it with. Dividing the teeth of the crown gear by those of the pinion gives you the ratio. For example, with a 9-tooth pinion, you get a 4:1 ratio, suitable for technical circuits with frequent braking and acceleration.

Do I need special tools for mounting?

No. A screwdriver of the correct size for the M2.5 screw and, optionally, a crown gear puller for disassembly is sufficient. Scaleauto and other specialized brands offer specific preparation tools for these types of tasks.

The Scaleauto SC-1146R is a 36-tooth M50 module sidewinder crown gear for 2.38 mm axles and 18.5 mm outer diameter, secured with an M2.5 grub screw. A reliable 1/32 slot car transmission part, ideal for club racing and performance builds requiring precise gear mesh and consistent power delivery.