27d crown gear. Anglewinder 25°

A crown designed to make the most of your anglewinder setup

The crown SC-1167R is a nylon spare part with 27 teeth specifically designed for anglewinder motors with a 25° angle. Manufactured to work with the Procomp-RS M50 motor, it fits onto a 2.38 mm axle, offers an outer diameter of ø15.8 mm, and is secured to the axle with an M2.5 screw, ensuring a solid and play-free assembly.

Function and performance

Nylon is the reference material for crown gears in the competitive slot racing world: it absorbs vibrations, operates quietly, and offers notable durability compared to stiffer materials. With 27 teeth, this crown is positioned in a gear ratio range that favours progressive acceleration and control in corners, particularly relevant in anglewinder setups where power transmission demands geometric precision.

The 25° angle inherent to the anglewinder configuration means that the crown and pinion operate on an inclined plane relative to the rear axle, which requires the crown to be manufactured with tight tolerances to ensure a clean mesh and no power loss. The SC-1167R is designed specifically for that context.

Compatibility

• Compatible motor: Procomp-RS M50 (anglewinder 25°)
• Axle diameter: 2.38 mm
• Outer diameter of the crown: ø15.8 mm
• Fixing: M2.5 screw
• Material: nylon
• Number of teeth: 27

Before installation, verify that your motor's pinion is compatible with a 25° anglewinder crown and that the pitch matches that of this crown to ensure correct meshing.

Assembly and preparation

The assembly is straightforward if the proper tools are available. We recommend using an Allen key of the correct size for the M2.5 screw and ensuring the crown is well centred on the axle before tightening it definitively. A slight misalignment can result in vibrations and premature wear of both the crown and the pinion.

Once assembled, check the lateral play between the crown and pinion: there should be minimal play, noticeable but not excessive. Too much clearance generates noise and loss of traction; too much pressure causes accelerated wear and can lock the transmission.

Common mistakes

• Using this crown with sidewinder or inline motors: the meshing angle would not be correct and wear would be premature.
• Over-tightening the M2.5 screw, which can deform the central hole of the crown or mark the axle.
• Not checking the pitch of the teeth before combining it with a pinion different from the original.

Frequently asked questions

Is this crown suitable for any anglewinder motor?

Not necessarily. It is specifically designed for the Procomp-RS M50 motor in a 25° anglewinder configuration. For other anglewinder motors, check that the angle, axle diameter, and tooth pitch are compatible before installation.

Can I use this crown in a sidewinder or inline configuration?

No. The geometry of the crown is optimised for a 25° meshing angle, characteristic of anglewinder configurations. Using it in a sidewinder or inline would generate incorrect meshing and accelerated wear.

What screw do I need to secure the crown to the axle?

The required screw is an M2.5. Ensure that you do not replace it with one of a different size, as the grip and centring depend on this specific size.

When should I replace the crown?

When you observe visible wear on the teeth (flattened or irregular flanks), unusual noise in the transmission, or loss of traction that does not improve when checking the rest of the drivetrain. In competitive slot racing, preventive maintenance of the crown and pinion is a regular part of car preparation.

Is nylon a suitable material for competition?

Yes. Nylon is one of the most commonly used materials in competitive slot crowns due to its ability to absorb vibrations, its quiet operation, and its good balance between durability and weight. It works well with metal pinions, which are usually the standard in serious setups.

The SC-1167R is a 27-tooth nylon crown gear designed for anglewinder 25° configurations, compatible with the Procomp-RS M50 motor, 2.38 mm axle and ø15.8 mm outer diameter, secured with an M2.5 screw. An essential slot car spare part for competitive and club racing builds requiring precise gear mesh and reliable power transfer.