13z extralight pinions

NSR Extralight 13-Tooth Pinions: Less Mass, More Track Response

Within the NSR spare parts range, the Extralight pinions hold a special place among tuners looking to minimise rotational inertia. With 13 teeth and 7.5 mm diameter, these pinions are designed to adjust the gear ratio while simultaneously lightening the motor-rear axle assembly. The pack includes 2 units.

Function and Performance

The pinion is one of the transmission elements with the greatest impact on the car's behaviour: its diameter and number of teeth determine the gear reduction ratio with the crown gear, and its mass directly influences the response to acceleration and regenerative braking. The NSR Extralight line specifically addresses that second factor: reducing the weight of the pinion without compromising strength or gear precision.

• 13 teeth: one of the most common options for fast track configurations or circuits with long straights.
• Diameter 7.5 mm: a key detail to verify compatibility with the motor and axle you are using.
• Extralight line: construction aimed at minimising rotational mass and improving the agility of the drivetrain.
• Pack of 2 units: you have a spare unit ready to use or to test in parallel.

Compatibility and Installation

NSR designs its range of pinions to work with its crown gears and motors, common in Sidewinder (transverse motor, parallel to the rear axle) and Inline (longitudinal motor, in line with the car) configurations. Always check that the inner diameter of the pinion matches your motor's axle and that the centre distance allows for a clean engagement with the chosen crown gear before installation. An incorrect fit generates noise, premature wear, and power loss.

Common Mistakes When Working with Pinions

• Forcing the pinion onto the axle without checking the inner diameter: this can damage the axle or leave the pinion loose.
• Not checking the backlash (play between pinion and crown gear): too tight a fit generates heat and friction; too loose, imprecision and wear.
• Mixing pinions of different modules with incompatible crown gears: the number of teeth is not the only parameter; the tooth module must match.
• Forgetting that changing the number of teeth on the pinion alters top speed and available torque: always test on a bench before competing.

Ideal For…

Club competitors who fine-tune the gear ratio according to the layout, tuners looking to minimise rotational mass, and enthusiasts who want to keep a stock of precision spare parts always on hand. If you already work with NSR components, these pinions fit naturally into your preparation workflow.

Frequently Asked Questions

How many pinions are included in the pack?

The NSR7113 pack includes 2 units of 13-tooth Extralight pinion.

What does "Extralight" mean in NSR pinions?

The Extralight designation indicates that the pinion has been manufactured with a process or material aimed at reducing its mass compared to standard versions, decreasing rotational inertia and improving the response of the drivetrain.

What motor configurations are they compatible with?

These pinions are suitable for both Sidewinder (motor parallel to the rear axle) and Inline (motor in line with the car) setups. Always verify the inner diameter of the pinion with your motor's axle before installation.

Is the 7.5 mm diameter the outer or inner diameter?

According to the provided information, the 7.5 mm figure corresponds to the diameter of the pinion. We recommend checking with NSR or our team if you need to confirm whether it is the outer or inner reference before placing your order.

Can I combine these pinions with crown gears from other brands?

In principle, it is possible as long as the tooth module is compatible. NSR designs its components to work together, so the most reliable combination is pinion and crown gear from the same NSR range.

NSR Extralight 13-tooth pinion gear, 7.5 mm diameter, pack of 2 units (ref. NSR7113). Designed for slot car competition, these lightweight pinions reduce rotational mass for faster acceleration response. Compatible with Sidewinder and Inline motor setups. A trusted choice for club racers and serious hobbyists looking to fine-tune their drivetrain ratio.