Sidewinder Extralight ERGAL Crown 30 teeth 16.8 mm for Hypercar

The NSR Extralight Crown for Hypercar: Competition Engineering in Every Tooth

When the goal is to get the most out of a competition model, the transmission is the first point where time is gained or lost. The NSR Sidewinder Extralight crown with 30 teeth and 16.8 mm (ref. NSR5930) is designed for the Hypercar range with a clear purpose: to minimise the rotational mass of the rear axle and convert every impulse from the motor into real forward motion on the track.

Function and Performance

The Sidewinder system positions the motor parallel to the rear axle, a configuration that transfers torque directly to the crown with very few mechanical losses. In this context, the weight of the crown itself becomes critically important: the lower its inertia, the quicker the response to changes in acceleration and braking.

With its Extralight design, NSR has worked on both the tooth profile geometry and the structural lightening of the part to achieve a component that is barely noticeable in the drivetrain, yet offers a completely silent and backlash-free mesh. The result is cleaner acceleration, more predictable deceleration, and a clear improvement in lap times.

Material and Manufacturing: CNC Machined ERGAL

NSR works with ERGAL, an aerospace-grade aluminium that combines outstanding mechanical strength with very low weight. This is not an ordinary alloy: its composition is the same as that used in sectors where failure margins are zero.

• High-precision CNC machining: each tooth is cut with micrometric tolerances, ensuring consistent geometry throughout the series and a vibration-free transmission.
• Anodised finish: the anodised layer protects the surface from oxidation and reduces the coefficient of friction in contact with the pinion, prolonging the lifespan of the assembly.
• Structural lightness: the lightening process maintains the structural rigidity necessary to withstand traction loads without deforming.

Compatibility

This crown is specifically designed for the NSR Hypercar chassis in Sidewinder configuration. To achieve optimal mesh and protect the integrity of the powertrain, the manufacturer recommends pairing it with pinions from the 71XX series. Using pinions from other series or manufacturers may compromise the tooth engagement and shorten the lifespan of the assembly.

Assembly and Preparation

Installing an Extralight crown does not require special tools, but certain care is necessary to ensure a proper fit that does not degrade the transmission from the first race:

1. Ensure that the rear axle is perfectly clean and free of old lubricant residues before installing the crown.
2. Check the lateral play between the crown and pinion: it should be minimal but without interference. Excessive tightening generates heat and premature wear; too much play produces noise and loss of torque.
3. Apply a small amount of specific slot gear lubricant to the flanks of the tooth, but do not overdo it.
4. After the first short run, check the contact condition between the pinion and crown: the wear pattern should be uniform along the tooth.

Common Mistakes

• Mixing pinions from non-recommended series: although they may fit physically, the tooth profile may not be compatible and increase wear.
• Over-tightening the crown onto the axle: this can deform the part and cause eccentricity, resulting in vibration at high speeds.
• Not checking lateral alignment: a crown misaligned by even tenths of a millimetre relative to the pinion quickly deteriorates both components.

Ideal for…

This crown is the natural choice for drivers who regularly compete with Hypercars and seek to fine-tune their gear ratio or simply replace the stock component with a higher performance one. It is also suitable for those who want to experiment with different gear ratios by adjusting the number of teeth on the crown or pinion according to the circuit layout.

Frequently Asked Questions

What is the difference between the Extralight crown and a standard NSR crown?

The Extralight version incorporates additional structural lightening work on the same ERGAL base, further reducing rotational mass compared to conventional crowns. This translates into a livelier response in acceleration and lower inertia in braking.

Is it compatible with other NSR chassis that are not Hypercar?

NSR specifies this crown for the Hypercar range. Although the diameter of 16.8 mm may match other models, we recommend verifying the exact compatibility with your chassis before installation to ensure the correct mesh with the pinion.

Which pinions should I use with it?

The manufacturer recommends the NSR 71XX series pinions to ensure optimal mesh and protect both components from premature wear.

Do I need to lubricate the crown after each race session?

It is not necessary to lubricate after each session, but it is advisable to check the condition of the lubricant periodically, especially in long sessions or on dusty tracks. Excess lubricant attracts dirt and can dirty the braids.

Does the anodised finish affect the tooth engagement?

The anodising is an extremely thin layer that NSR already accounts for in the final machining of the part, so it does not alter the specified mesh tolerances.

When should I change the crown?

Clear signs of wear include the appearance of noise in the transmission that did not exist before, vibration at high revolutions, or visible wear on the tooth flanks when inspected with a magnifying glass. Under club use conditions, with good maintenance, the lifespan is long.

The NSR Sidewinder Extralight 30-tooth crown (ref. NSR5930) is a precision CNC-machined ERGAL gear designed for NSR Hypercar slot car chassis. Its ultra-lightweight anodised aluminium construction minimizes rotational mass, delivering faster acceleration response and smoother power transfer on the track. Compatible with NSR 71XX series pinions for optimal mesh. A go-to upgrade for serious 1/32 slot racing competitors looking to fine-tune their gear ratio and improve lap times.