Crown gear 30 D screw M2 plastic 16mm lightweight

Adjust the transmission without adding extra grams with the lightweight crown gear from Slot.it

The reference SIGA1630-LPL is the 30-tooth crown gear from Slot.it made of lightweight plastic, with a diameter of 16 mm and fixing via M2 screw. A seemingly simple spare part, but with a decisive role in the behaviour of any slot car: the crown gear, along with the pinion, is the component that defines the gear ratio and, therefore, the acceleration and top speed of the model.

Main features

• Number of teeth: 30
• Diameter: 16 mm
• Fixing: M2 screw
• Material: lightweight plastic (design with weight relief windows)

Function and performance

In any slot transmission, the crown/pinion ratio determines how many revolutions the motor makes for each revolution of the rear axle. A 30-tooth crown paired with a small pinion offers a multiplying ratio that favours top speed, suitable for fast tracks with long straights. If combined with a larger pinion, the ratio shortens and gains in acceleration and response.

The lightweight plastic finish — with the characteristic windows or cutouts in the crown — reduces the rotating mass compared to solid versions, resulting in lower inertia and more responsive acceleration and braking. A detail that shows real differences on the stopwatch, especially on technical circuits with many changes of pace.

Compatibility and installation

This crown gear is designed within the Slot.it spare parts system, compatible with the axles and chassis of the brand that use M2 screw fixing. Before installing it, it is advisable to check that the tooth module matches that of the pinion you already have mounted, as mixing different modules causes noise, accelerated wear, and loss of efficiency in the transmission.

Installation is straightforward: place the crown on the axle, align it correctly with the pinion leaving the minimum recommended clearance (so that the teeth mesh without tightness but without excessive play) and tighten the M2 screw to the appropriate torque. Over-tightening can deform the plastic; insufficient tightening will cause the crown to move during racing.

Common mistakes

• Combining this crown with a pinion of a different module. Always check that both share the same tooth module.
• Over-tightening the M2 screw on the plastic version. Lightweight plastic is more sensitive than aluminium; adjust gently.
• Not checking the lateral alignment between crown and pinion before closing the chassis. A slight misalignment generates vibrations and premature wear.

Ideal for...

Preparers and enthusiasts who want to reduce rotating weight in their drivetrain, or who need to replace a worn crown while maintaining the same gear ratio. Also for those experimenting with different pinions seeking the optimal point between acceleration and top speed on each layout.

Frequently asked questions

What is the difference between a lightweight plastic crown and an aluminium one?

The main difference is weight and, consequently, rotating inertia. Lightweight plastic is lighter, which reduces moving mass and allows for more agile responses. Aluminium, on the other hand, usually offers greater dimensional precision and durability under intensive use conditions. The choice depends on the balance you seek between performance and durability.

Which pinions is this crown compatible with?

It is compatible with Slot.it pinions that share the same tooth module. Check the Slot.it catalogue to identify the pinions of the correct module before proceeding with the installation.

How do I know which gear ratio is suitable for me?

It depends on the layout and the motor. Longer ratios (large crown / small pinion) favour top speed on fast tracks. Shorter ratios (small crown / large pinion) provide more acceleration on technical circuits. With 30 teeth on the crown, the pinion you mount will define the final result; try different combinations to find the optimal point.

Is the installation difficult?

No. You just need to place the crown on the axle, align it with the pinion, and tighten the M2 screw carefully. Take a moment to check the clearance between teeth and the lateral alignment before closing the chassis, and the installation will be perfect.

Can it be used on chassis from other brands?

In principle, as long as the axle allows M2 screw fixing and the tooth module matches that of your pinion. However, Slot.it designs its spare parts with its own system in mind, so optimal compatibility occurs with its own chassis and axles.

The Slot.it SIGA1630-LPL is a 30-tooth lightweight plastic crown gear, 16 mm diameter, M2 screw fixing. Designed to reduce rotational mass and fine-tune gear ratios in slot car builds. A precision spare part for club racers and serious hobbyists looking to optimise acceleration and top speed on any track layout. Compatible with Slot.it axles and M2 fixings within the brand's ecosystem.