Sidewinder Extralight ERGAL Crown 29 teeth 16.8 mm for Hypercar

The NSR Sidewinder Extralight ERGAL 29T crown takes your Hypercar's transmission to another level

Within the NSR spare parts catalogue, the Extralight range represents the most technical option for those who fine-tune every gram of their cars. This 29-tooth crown with a diameter of 16.8 mm is designed exclusively for the Sidewinder configuration —motor parallel to the rear axle— of the Italian brand's Hypercar models, and its design leaves no room for chance.

Function and performance

ERGAL is a high-strength aluminium alloy widely used in competition for its excellent strength-to-weight ratio. NSR machines it using CNC processes from solid bars, ensuring perfect geometry in each tooth, with no tolerances that compromise the mesh with the pinion. The result is a precision gear that transmits the motor's power with minimal mechanical losses.

The anodization of the finish is not merely aesthetic: it protects the aluminium against wear from friction and significantly extends the lifespan of the part, which is especially appreciated during long running sessions or in championship formats.

Compatibility and assembly

This crown is designed for the NSR Hypercar models with Sidewinder configuration. To achieve maximum performance and preserve the lifespan of the teeth, NSR recommends pairing it with pinions from the 71XX series, which ensure a correct mesh and a smooth, quiet transmission.

• Number of teeth: 29
• Diameter: 16.8 mm
• Material: CNC machined ERGAL
• Finish: anodized
• Configuration: Sidewinder (transverse motor)
• Compatibility: NSR Hypercar models
• Reference: NSR5929

Assembly and preparation

The adjustment of the crown is one of the most critical steps in tuning any competitive slot car. It is essential to verify that the distance between the crown and pinion is correct: too much play generates vibration and power loss; too much tension increases wear and consumption. Careful assembly, checking the mesh with the chosen pinion before permanently securing the crown, will make a difference in the smoothness of operation.

Due to its low weight, this crown helps reduce the rotational inertia of the rear axle, resulting in a more immediate response when accelerating and more effective braking when releasing the trigger. This is a noticeable advantage, especially on technical circuits with many tight corners.

Common mistakes

• Mounting this crown with incompatible series pinions, which can cause premature wear or poor meshing.
• Not checking the lateral alignment of the crown relative to the pinion before securing it, leading to uneven rubbing.
• Over-tightening the fixing screw on the axle, which can slightly deform the part and alter concentricity.

Frequently asked questions

Is this crown compatible with all NSR cars or just the Hypercar?

It is specifically designed for the NSR Hypercar models with Sidewinder configuration. Although it could physically fit other NSR Sidewinder chassis with the same gear pitch, NSR has dimensionally optimized it for the Hypercar family, where it offers the best performance and fit.

What pinions should I use with this crown?

NSR recommends pairing it with pinions from the 71XX series to ensure correct meshing, smooth running, and optimal durability of both parts.

What advantage does ERGAL offer over plastic in a crown?

CNC machined ERGAL provides a more precise tooth geometry, greater wear resistance, and a lightness that reduces rotational inertia. This translates to a quicker motor response and a more efficient power transmission, something that standard plastic cannot match at a competitive level.

Does anodization affect the behaviour of the crown?

It does not alter the mechanical properties of ERGAL, but it does protect the surface against abrasion and corrosion, increasing the lifespan of the part. Additionally, it allows for visual identification of the different references in the NSR Extralight range.

When is it advisable to choose 29 teeth over other options in the range?

The number of teeth on the crown directly determines the gear ratio along with the chosen pinion. A 29-tooth crown offers a medium-high multiplication, suitable for mixed circuits where a balance between acceleration and top speed is needed. For very fast circuits with few corners, a crown with more teeth can increase maximum speed; for technical circuits with many corners, reducing the teeth improves acceleration.

NSR Sidewinder Extralight ERGAL 29-tooth crown (16.8 mm) for Hypercar slot cars — precision CNC-machined from high-strength anodized ERGAL alloy for reduced rotational mass and faster throttle response. Designed exclusively for NSR Hypercar Sidewinder configuration, it pairs ideally with 71XX series pinions for smooth, efficient power delivery on the track. A top choice for club racers and competitive slot car enthusiasts seeking a reliable, lightweight gear upgrade.