7t nylon pinion (4 pcs)

Four nylon pinions ready to mount, with the right tooth count for those seeking a short and agile gear ratio.

The pinion is one of the components that most influences the character of a slot car: changing it means modifying the gear ratio and, with it, the acceleration, top speed, and overall behaviour on track. This set includes 4 units of 7-tooth nylon pinions, designed for those who want to have spare parts on hand or test adjustments without being left short in the middle of a session.

Technical specifications

• Number of teeth: 7z
• Material: nylon
• Module: 0.5 mm
• Outer diameter: 4.5 mm
• Length: 5 mm
• Axle diameter (press-fit mounting): 2 mm
• Colour: turquoise blue
• Contents: 4 pinions per set

Function and performance

With 7 teeth and a 0.5 mm module, this pinion fits into the common transmission combinations of competitive and tuned slot cars. A small pinion like this, paired with a crown gear of a higher tooth count, provides a long gear ratio: more top speed at the expense of some initial acceleration. It is the usual choice for fast circuits with long straights where the motor can develop its full potential.

Nylon dampens vibrations better than brass and operates more quietly, although it is somewhat less heat-resistant in very intense sessions. For regular use in clubs or at home, it offers more than sufficient performance and a considerable lifespan.

Assembly and preparation

The assembly is by direct pressure onto 2 mm diameter axles, without the need for special tools, although it is advisable to use a small mounting tool to ensure perpendicularity and avoid damaging the teeth. Before tightening, check that the pinion is centred with respect to the crown gear to avoid lateral play that generates noise and premature wear.

The turquoise blue colour makes them easy to identify visually among the rest of the workshop materials, especially useful when working with multiple gear ratios at the same time.

Common mistakes

• Mounting the pinion without checking alignment with the crown gear: although the press fit is straightforward, a couple of tenths of misalignment can cause rapid wear on both parts.
• Confusing the module: ensure that your crown gear is also 0.5 mm module. Mixing different modules ruins the transmission.
• Forcing disassembly without a tool: removing a press-fit pinion by pulling on the axle can deform both the pinion and the axle. Always use an appropriate extractor.

Frequently asked questions

What type of crown gear should I use with this pinion?

With any crown gear of 0.5 mm module. The number of teeth on the crown will determine the final gear ratio along with these 7z of the pinion.

Is it compatible with any slot car?

It can be used in any car that has 2 mm diameter rear axles and a transmission with 0.5 mm module, which is the most widespread standard in 1/32 scale slot racing.

Does nylon hold up well in competition?

For club use and amateur competition, nylon works perfectly. In high-performance competition with very powerful motors and long sessions, some tuners prefer brass for its greater thermal resistance, although nylon remains the most common and economical option for running and tuning.

Why are 4 units sold in the set?

Having multiple units allows for testing different gear ratios by changing crown gears without running out of pinions, and also having spare parts available in case of any breakage or wear.

What gear ratio do I get with this pinion?

The gear ratio depends on the number of teeth of the crown gear you use. For example, with a 27-tooth crown gear, the ratio would be 27/7 ≈ 3.86:1. A higher ratio means more top speed; a lower ratio means more acceleration.

Set of 4 nylon pinions with 7 teeth, 0.5 mm module, 4.5 mm outer diameter and 5 mm length. Designed for press-fit mounting on 2 mm axles. A standard slot car transmission component compatible with 1/32 scale slot racing setups. Ideal for club racing preparation, gear ratio tuning and spare parts stock. Keywords: nylon pinion 7t slot car, 0.5 module pinion, slot car transmission gear, 7 tooth pinion 2mm axle, slot car spare parts.