12z extralight pinions

NSR 12z Extralight Pinions: less rotating mass, more track response

The Extralight pinions from NSR are a well-established reference among tuners looking to maximise the drivetrain performance of their slot cars. The reference NSR7112 offers 12 teeth and a diameter of 7.5 mm in a lightweight design that reduces rotational inertia compared to standard pinions.

Function and performance

In a slot car drivetrain, the pinion is the first link that receives the motor's rotation and transfers it to the crown gear. The lower its mass, the less energy is "lost" in accelerating the component itself, and more effectively reaches the wheels. NSR's Extralight pinions are designed precisely with this criterion: to maintain the rigidity and dimensional precision necessary for a clean transmission while cutting weight wherever possible.

• Teeth: 12z
• Diameter: 7.5 mm
• Pack content: 2 units
• Range: Extralight (lightweight)

Compatibility and installation

NSR pinions are designed to work with the brand's own crown gears and axles, although their use has extended to custom setups with other market components. Before installation, it is advisable to verify that the pinion's module is compatible with that of the chosen crown gear and that the fit on the motor axle is correct to avoid play or unnecessary tension in the drivetrain.

Good alignment between pinion and crown gear, with the appropriate lateral separation, extends the life of both components and contributes to a quieter and more efficient transmission.

Installation and preparation

For a clean installation, it is recommended to:

1. Clean the motor axle before placing the pinion to ensure a good grip.
2. Check the alignment with the crown gear before finalising the fit.
3. Apply a minimal amount of axle adhesive if play is detected, without excess that could hinder future disassembly.
4. Check the backlash with the crown gear: sufficient for free rotation, minimal to avoid transmission losses.

Ideal for…

This pinion fits particularly well in setups aimed at club competition or technical preparation where every gram of the drivetrain is optimised. It is also a good choice when working with high-response motors where the inertia of the drivetrain can mask the actual performance of the motor.

Frequently asked questions

What real advantage does an Extralight pinion offer over a standard one?

By reducing the mass of the pinion, the rotational inertia of the drivetrain is decreased. The result is a livelier acceleration from low speeds and a more immediate response when releasing the brake in a corner. On technical tracks with many changes of pace, the difference is noticeable.

Does the pack include 2 identical pinions?

Yes, the NSR7112 pack contains 2 identical units: 12 teeth, 7.5 mm diameter, Extralight range.

Which crown gears is this pinion compatible with?

NSR designs its pinions to work with its own crown gears. To ensure a clean and durable transmission, it is most advisable to pair pinions and crown gears from the same manufacturer and of the same module. Consult the NSR gear chart to confirm the appropriate combination based on the desired gear ratio.

What type of motor is it intended for?

The reference is not restricted to a specific motor: the choice of pinion depends on the diameter of the motor axle and the desired gear ratio. 12-tooth pinions are typically used in combinations with crown gears of a higher tooth count to achieve long gear ratios, common in high-speed circuits.

How long do these pinions last?

Durability depends on the material of the crown gear they are paired with, the level of lubrication, and the type of use. In intense competition, it is advisable to periodically check for wear. Having a second pair in the pack makes it easy to have a spare ready without delay.

NSR Extralight 12-tooth pinions (ref. NSR7112), 7.5 mm diameter, pack of 2 units. Engineered for slot car competition, these lightweight pinions reduce rotational inertia for sharper throttle response and faster acceleration. A favourite among club racers and technical builders looking to fine-tune their drivetrain. Compatible with NSR crown gears; always verify module and axle diameter before fitting.