SIDEWINDER EXTRALIGHT ERGAL CROWN GEAR 28 TOOTH 16.8 MM

The Sidewinder crown that NSR created to maximise Hypercar performance

When competing seriously, every gram of rotating mass matters. This Extralight crown with 28 teeth and 16.8 mm belongs to NSR's transverse transmission (Sidewinder) family, a leading brand in the high-performance spare parts segment for 1/32 slot cars. The piece is machined from solid bars of ERGAL, the 7075 aluminium alloy that the aerospace industry and competition motorcycle preparation adopted long before it reached slot circuits.

Function and performance

In a Sidewinder configuration, the motor works parallel to the rear axle, which directly translates any improvements in lightness or dimensional accuracy to the performance of the crown. By reducing the mass of the rotating assembly, the motor reaches its optimal regime sooner, and the throttle response becomes more immediate and predictable. The machining of the 28 teeth using CNC machining ensures a consistent gear profile across all units, resulting in quieter operation, reduced vibration, and lower friction even after many hours of running.

The pitch diameter of 16.8 mm places this crown in a gear ratio range designed to balance top speed with acceleration on medium-high speed tracks. Its anodisation protects the aluminium from abrasion and facilitates quick identification of the tooth ratio during pit maintenance.

Compatibility

This crown is specifically designed for the NSR Hypercar range. To ensure proper fit and prolong the lifespan of the transmission system, NSR recommends pairing it with the pinions from the 71XX series. Using pinions from other series or brands may compromise gear alignment and cause premature wear on both parts.

Installation and preparation

• Before installation, check that the rear axle and motor are properly aligned; a well-machined crown does not compensate for a misaligned chassis.
• Apply a minimal amount of specific slot transmission lubricant to the teeth: excess attracts dust and degrades the gear faster than it seems.
• Check the backlash with the crown already mounted: a slight play is necessary; excessive tension loads the motor and reduces top speed.
• After the first running sessions, check the wear on the teeth and readjust if necessary.

Common mistakes

• Mixing incompatible pinion series: although the diameter may visually fit, the module may differ, and the gear will not be correct.
• Over-tightening the fixing screw: ERGAL is strong but does not tolerate excessive tightening with power tools; use a manual wrench and do so carefully.
• Ignoring motor-crown-pinion alignment: this is the factor that most influences the lifespan of the crown, above the material itself.

Frequently asked questions

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

Extralight crowns incorporate a lightweight design in the body of the piece—without sacrificing the tooth area—that reduces total mass and, therefore, rotational inertia. The result is a more responsive throttle opening and less load on the motor.

Can I use this crown in an Inline or Anglewinder configuration?

No. This crown belongs to the Sidewinder family, where the motor works parallel to the rear axle. Inline (motor perpendicular to the axle) or Anglewinder (motor at an angle) configurations require crowns with specific geometry for each layout.

Which pinions is it compatible with?

NSR recommends pairing it with the pinions from its 71XX series. This is the combination for which it has been designed and ensures the correct gear module, precise fit, and maximum durability of the system.

In which NSR cars can I mount it?

This crown is aimed at the NSR Hypercar range. If you have doubts about whether it fits a specific model, consult the technical sheet of the chassis or contact us before placing your order.

Does the colour of the anodisation affect performance?

No. The colour is solely functional for quick identification of the number of teeth in the pits. The anodisation treatment does serve a technical function: it protects the aluminium alloy from abrasion and oxidation.

How long does this crown last under intensive competition use?

Durability mainly depends on the correct alignment of the transmission train, the lubricant used, and the pinion it is paired with. With proper installation and periodic maintenance, CNC machined ERGAL offers a lifespan far superior to that of plastic or zamak crowns.

NSR Sidewinder Extralight 28-tooth crown, reference NSR5928, CNC machined from ERGAL aluminium alloy for minimum rotational inertia and precise gear meshing. Designed for NSR Hypercar slot cars in 1/32 scale, compatible with 71XX series pinions. Anodized finish for corrosion resistance and quick pit-lane identification. An essential upgrade for competitive slot racing, delivering faster throttle response and consistent power transfer on any layout.