31t 16.8mm Crown Anglewinder

NSR 31-Tooth Anglewinder Crown Gear: Fine-Tuned Transmission for Your Anglewinder Setup

When the car's configuration is anglewinder —motor mounted at an angle to the rear axle— the crown gear is one of the components that most influences the final behaviour. This crown gear with 31 teeth and a diameter of 16.8 mm is specifically designed for anglewinder mounts at 15°, and is part of the NSR transmission range, a benchmark brand in the world of competitive slot racing.

Technical Features

• Reference: NSR6531
• Number of Teeth: 31t
• Diameter: 16.8 mm
• Mounting Type: Anglewinder 15°
• Recommended Pinions: NSR71XX with a diameter of 7.5 mm
• Compatibility: NSR cars with anglewinder configuration

Function and Performance

The gear ratio offered by a 31-tooth crown gear, combined with the NSR71XX pinions, allows for a balance between acceleration and top speed that is highly appreciated on mixed circuits or those with medium-radius corners. With 31 teeth, the crown gear provides a moderate multiplication: sufficient traction on corner exit and controlled speed on the straights.

The precision manufacturing of NSR ensures smooth engagement with no play, resulting in less vibration transmitted to the chassis and greater durability of the transmission assembly.

Compatibility and Mounting

This crown gear is designed for NSR cars with the motor in an anglewinder position at 15°. For proper operation, NSR recommends pairing it with pinions from the NSR71XX series, which have a diameter of 7.5 mm. Adhering to this combination is key to achieving the correct alignment between crown and pinion, avoiding premature wear and maintaining a quiet transmission.

Before mounting, always check that the rear axle and motor mount of the chassis are compatible with the anglewinder configuration at 15°. A careless installation at this point can create lateral play or rubbing that penalises performance on the track.

Common Mistakes

• Using pinions of a different diameter than recommended (7.5 mm): this can cause poor engagement and accelerated wear.
• Mounting this crown gear in a sidewinder or inline configuration: it is not designed for those mounting angles.
• Not checking the play between crown and pinion after mounting: excessive play generates noise and loss of efficiency; no play at all can block the transmission.

Ideal for…

Drivers competing with NSR cars in anglewinder configuration who seek to adjust the gear ratio to suit different track layouts. It is also useful as a maintenance replacement after intense running sessions, as crown gears are wear items that should be checked periodically.

Frequently Asked Questions

What is the difference between an anglewinder crown and a sidewinder?

The difference lies in the angle formed by the motor relative to the rear axle. In an anglewinder setup, the motor is tilted at 15° to the axle; in the sidewinder, the motor is parallel to the rear axle. Each configuration requires a specific crown gear, so they are not interchangeable.

Which pinions should I use with this crown gear?

NSR recommends the pinions from the NSR71XX series, with a diameter of 7.5 mm. Using pinions of a different size may compromise engagement and reduce the lifespan of both parts.

How do I know which gear ratio is suitable for me?

It depends on the track and the motor. A larger crown (more teeth) provides more acceleration but less top speed; a smaller crown prioritises speed on the straight. With 31 teeth, you are in an intermediate range, versatile for mixed circuits. It is common to try different combinations until you find the optimal one for your track and motor.

When should I change the crown gear?

When you notice unusual noise in the transmission, vibration, or a loss of performance that cannot be explained by other factors. Crown gears are wear items; checking them periodically is part of the regular maintenance of any competition car.

Is it compatible with chassis from other brands?

It is designed and recommended for NSR cars. If you have a chassis from another brand with an anglewinder configuration at 15°, compatibility will depend on the dimensions of the motor mount and the rear axle. In case of doubt, consult the specifications from the chassis manufacturer.

The NSR6531 is a 31-tooth, 16.8 mm anglewinder crown gear designed for NSR slot cars running a 15° anglewinder motor configuration. Paired with NSR71XX pinions (7.5 mm diameter), it delivers smooth, precise transmission for club racing and competition. A reliable replacement part for NSR anglewinder setups, ideal for tuning gear ratios to suit different track layouts.