13z Sidewinder Extralight pinions

NSR 13z Sidewinder Extralight Pinions: less mass, more response in every corner

The pinions from the Extralight line of NSR are a well-established reference among slot car tuners looking to squeeze every tenth from the clock. This pack includes 2 units of 13-tooth pinions specifically designed for Sidewinder setups — that is, with the motor positioned parallel to the rear axle — and have a diameter of 6.5 mm.

Function and performance

The pinion is the first link in the transmission: it receives the rotation from the motor and transfers it to the crown gear. Its weight and stiffness have a direct impact on the efficiency of that transmission. NSR's Extralight philosophy aims to minimise rotating mass, which translates into:

• Quicker acceleration from the corner exit.
• Less inertia, facilitating more predictable braking.
• More direct transmission between motor and rear axle.

Compatibility and installation

These pinions are designed for Sidewinder configurations, the motor layout where the motor is placed transversely to the rear axle, very common in NSR chassis and in many modern competition cars. The diameter of 6.5 mm is a key factor when selecting the correct gear ratio alongside the corresponding crown gear.

Before installation, it is advisable to check that the pinion fits correctly on the motor shaft and that it is aligned with the crown gear without excessive lateral play or rubbing. A slight misalignment is one of the main causes of efficiency loss and premature wear.

Preparation and common mistakes

• Check the fit on the motor shaft: a pinion that slips or is too tight directly affects performance. Use the appropriate adhesive as recommended by the manufacturer.
• Check alignment with the crown gear: always work with the chassis mounted in real-use position, not just on the bench.
• Do not mix pinions of different weights or materials in comparative tests: results can be confusing if more than one variable is changing at the same time.
• Respect the tooth: a strong impact or fall can damage one or more teeth without being visible to the naked eye. In case of any irregularity in the transmission, check the condition of the pinion before looking for the problem in another component.

Ideal for…

Club racers and competitors working with NSR chassis in Sidewinder configuration who want to fine-tune the gear ratio or reduce rotating mass as part of a more demanding setup. Also for those replacing worn pinions who prefer to maintain the original components from the NSR range.

Frequently asked questions

How many pinions are included in this pack?

The pack contains 2 units of the NSR 13z Sidewinder Extralight pinion.

What does "Sidewinder" mean in this context?

Sidewinder indicates that these pinions are designed for setups where the motor is placed parallel to the rear axle (transversely). They are not interchangeable with Inline or Anglewinder configurations without verifying compatibility.

What is the diameter of this pinion?

The diameter of the pinion is 6.5 mm. This is an essential detail for calculating the gear ratio alongside the crown gear you will be using.

What advantage does the Extralight line offer over a standard pinion?

The reduction of rotating mass improves response in acceleration and braking, especially on technical circuits with many changes in pace.

Which NSR crown gears is this pinion compatible with?

NSR designs its pinions to work with the crown gears from its own catalogue. Check the appropriate crown reference according to the pitch and number of teeth you need for your target gear ratio. We do not have verified data on specific compatibilities outside the NSR ecosystem.

NSR Sidewinder Extralight 13-tooth pinion gear, 6.5 mm diameter — pack of 2 units. Designed for sidewinder motor configurations, this lightweight pinion reduces rotational mass for sharper acceleration and more responsive braking. A trusted choice for slot car club racers and serious hobbyists building or tuning NSR-based chassis. Compatible with NSR slot car drivetrains running sidewinder setups.