Crown gear 28d. Anglewinder 25 Procomp-RS

The anglewinder crown gear that fine-tunes the transmission in every tenth

The 28d. Anglewinder 25 Procomp-RS Crown (ref. SC-1168R) from Scaleauto is a transmission component designed for anglewinder setups at 25 degrees, where the motor angle requires a crown gear with specific geometry to ensure correct engagement with the pinion without efficiency losses or transmission noise.

Technical specifications

• Number of teeth: 28 (M50)
• Configuration: Anglewinder 25 degrees
• Material: Procomp-RS Polyamide
• Compatible axle: 2.38 mm
• Diameter: 15.8 mm
• Fixing: M2.5 screw

Function and performance

The Procomp-RS material is Scaleauto's choice for competition crown gears: a high-strength polyamide that combines structural rigidity with the ability to absorb micro-vibrations in the transmission. The result is a clean engagement, free of play, that maintains a constant gear ratio throughout the race.

With 28 teeth on an M50 module, this crown gear offers an intermediate gear ratio: sufficient acceleration without sacrificing top speed on the straights. It is a common choice on mixed circuits where the balance between traction and speed makes a difference.

Compatibility and installation

Specifically designed for anglewinder configurations at 25 degrees, which differentiates it from sidewinder or inline crown gears: the motor angle relative to the rear axle requires the crown gear to have the correct inclination for optimal engagement with the pinion. Installing a sidewinder crown on an anglewinder chassis would cause interference and performance losses.

The compatible axle is the standard 2.38 mm, common in most setups and competition chassis. The fixing with an M2.5 screw allows for secure tightening without the risk of deforming the crown gear. Before installation, it is advisable to check the alignment with the pinion and adjust the engagement distance with minimal play, without forcing the contact.

Installation and preparation

• Ensure that the axle is clean and free of burrs before inserting the crown gear.
• Adjust the axial position of the crown gear so that the engagement with the pinion is centred.
• Tighten the M2.5 screw with the appropriate tool; excessive tightening can deform the polyamide.
• Apply a minimal amount of lubricant at the engagement point to reduce wear during operation.
• Check the play between the pinion and crown gear: there should be a small amount of play, never forced contact or excessive play.

Common mistakes

• Confusing the crown gear angle: an anglewinder crown gear is not interchangeable with a sidewinder even if they share the same module and number of teeth. Always verify the chassis configuration.
• Forcing the engagement: an overly tight engagement generates heat, accelerated wear, and can lock the transmission during a race.
• Ignoring axial alignment: a misaligned crown gear relative to the pinion produces vibrations and loss of power transferred to the axle.

Ideal for…

This crown gear is the right choice for those preparing or refining a chassis with a 25-degree anglewinder configuration and seeking a clean and durable transmission. Whether you are participating in club championships or preparing a car for demanding recreational sessions, the Procomp-RS from Scaleauto offers consistent and predictable performance that facilitates tuning.

Frequently asked questions

Can I use this crown gear on a sidewinder chassis?

No. This crown gear is specifically designed for anglewinder configurations at 25 degrees. Using it on a sidewinder chassis would result in incorrect engagement with the pinion, generating noise, performance loss, and premature wear.

Which pinions is it compatible with?

Being an M50 crown gear (module 50), it is compatible with pinions of the same module. The provided information does not specify particular pinions recommended by Scaleauto, so it is advisable to verify compatibility with your motor's pinion before installation.

What advantage does the Procomp-RS material offer over other plastics?

The Procomp-RS polyamide offers greater rigidity and wear resistance than conventional plastics, maintaining the tooth shape for more races and reducing transmission vibrations that can affect car stability.

Does it need lubrication?

A minimal amount of lubricant at the engagement point with the pinion extends the life of the crown gear and reduces transmission noise. Apply only what is necessary: excess lubricant can attract dirt and stain the track.

Is the M2.5 screw included?

The product description does not specify whether the screw is included. We recommend confirming this with our team before placing your order if you do not have M2.5 screws in your preparation bench.

The Scaleauto SC-1168R is a 28-tooth anglewinder crown gear at 25 degrees, made from Procomp-RS polyamide, compatible with 2.38 mm axles and M2.5 grub screw fixing. With a 15.8 mm diameter and M50 module, it delivers clean and efficient power transfer for slot car racing builds requiring precise anglewinder transmission setups.