15z extralight pinions

NSR 15z Extralight Pinions: less weight in rotation, more response in every corner

Within the NSR spare parts catalogue, the pinions from the Extralight line hold a prominent position among the most demanding preparers. The reference NSR7115 includes two pinions with 15 teeth and 7.5 mm diameter made from a lightweight material that reduces rotational mass, one of the factors that most influences acceleration and speed recovery after corners.

Function and performance

The pinion is the link between the motor and the crown gear: it transmits the rotation of the motor shaft to the rear crown and, with it, to the drive axle. Any variation in its weight, number of teeth, or material directly affects how the car responds to the trigger.

• 15 teeth: an intermediate tooth count that balances acceleration and top speed, suitable for a wide variety of tracks.
• Diameter 7.5 mm: the only dimensional data provided by NSR for this reference; verify compatibility with your motor axle before installation.
• Extralight construction: the lightweight material decreases rotational inertia, resulting in a more responsive acceleration and cleaner braking.
• Pack of 2 units: sufficient for testing configurations or having a spare unit ready in the box.

Compatibility and installation

NSR designs its pinions for its own motor and chassis lines, although exact compatibility depends on the diameter of the motor shaft and the module of the crown gear you intend to pair it with. Before installation, check:

• That the inner diameter of the pinion fits your NSR motor shaft.
• That the module of the pinion matches that of the chosen crown gear to avoid play or interference.
• The lateral alignment between pinion and crown gear: even minimal misalignment generates premature wear and loss of efficiency.

Installation does not require special tools, but it does require patience and a reliable alignment reference. A small lateral displacement can make the difference between a quiet transmission and one that generates vibration.

Tuning and setup

The Extralight pinions integrate perfectly into a setup aimed at reducing weight where physics appreciates it most: in the rotating parts. Combined with lightweight crowns and axles, the result is a significantly more agile transmission system. If you are looking to fine-tune the gear ratio, remember that changing the number of teeth on the pinion—while keeping the crown fixed—is the quickest way to adjust the character of the car to different track lengths.

Frequently asked questions

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

By weighing less, the mass that the motor must move when accelerating is lower. This improves initial response and can reduce motor consumption during long runs.

How many pinions are included in the NSR7115 pack?

The pack includes 2 units.

Which NSR motors are compatible with these pinions?

NSR does not specify in this reference the compatible motors beyond the 7.5 mm diameter. Check the technical data sheet of your motor to confirm that the axle diameter matches before installation.

What gear ratio will I achieve with 15 teeth?

It depends on the number of teeth of the crown gear you combine it with. More teeth on the crown compared to the pinion results in greater multiplication and, therefore, more top speed at the expense of some acceleration. With 15z on the pinion, you have room to adjust in both directions.

Can they be used interchangeably in anglewinder or sidewinder configurations?

The pinion itself is the same component; what varies is the position of the motor in the chassis. Ensure that the module and diameter match the crown gear of your specific configuration before installing it.

NSR Extralight 15-tooth pinion gear, 7.5 mm diameter, pack of 2 units — reference NSR7115. Lightweight slot car pinion designed to reduce rotational mass and improve throttle response. Compatible with NSR motor range; check axle diameter before fitting. Ideal for club racing and competitive slot car tuning setups.