29 teeth, M2 hex screw, light plastic, Ø16mm

Slot.it 29t Crown in Lightweight Plastic: Transmission Fine-Tuned to the Gram

When the setup of a slot car is worked on in detail, the choice of crown makes a difference. This piece from Slot.it —reference SIGA1629-LPL— offers 29 teeth, a diameter of 16 mm, fixing via M2 hex screw, and is made from lightweight plastic (Light Plastic). A combination designed to reduce rotational mass without sacrificing reliability in the gearing.

Function and Performance

The crown is the last link in the kinematic chain before the power reaches the rear axle. Its number of teeth, combined with the pinion mounted on the motor, determines the final gear ratio: more teeth equate to more torque out of corners; fewer teeth, to higher top speed. With 29 teeth, it sits in an intermediate-high range, versatile for tracks with many medium curves.

The lightweight plastic material from Slot.it reduces rotational inertia compared to standard plastic or metal versions, resulting in a livelier throttle response and cleaner braking. Ideal when every tenth counts.

Compatibility

This crown is designed for Slot.it transmission systems compatible with the M2 hex screw fixing standard and Ø16 mm crown axle. Before installing, check that your motor's pinion and tooth pitch are compatible with the Slot.it SIGA crown range. Consult the official catalogue or contact us if you have questions about the appropriate pinion-crown combination for your setup.

Installation and Preparation

• Carefully remove the previous crown by loosening the M2 screw without forcing the axle.
• Clean the axle before installing the new crown to ensure a perfect fit.
• Tighten the M2 screw with the appropriate hex tool, without over-torquing: the lightweight plastic is durable, but excessive tightening can damage the housing.
• Check the lateral play between the crown and pinion before closing the chassis. A gear mesh that is too tight generates heat and wear; too loose produces skipping and loss of efficiency.
• Apply a minimal amount of specific slot transmission lubricant to the teeth if the track or session is going to be long.

Common Mistakes

• Mixing incompatible tooth pitches between crown and pinion. Always confirm that both pieces are of the same module standard.
• Ignoring the centring of the crown on the axle. An off-centre crown generates vibration and premature wear of the teeth.
• Not checking the gear ratio based on the track: a 29t crown may be optimal on a technical circuit but fall short on a high-speed track with long straights.

Frequently Asked Questions

What is the difference between the lightweight plastic version and the standard one?

The lightweight plastic has a lower density, which reduces the rotational mass of the drivetrain. This improves throttle response and braking, especially in cars with anglewinder or inline configurations where the inertia of the rear end influences behaviour more directly.

Which pinions is this crown compatible with?

It must be combined with pinions of the same tooth module as the Slot.it SIGA range. Consult the Slot.it compatibility chart or contact our team to ensure you choose the correct pinion according to your motor and car configuration.

Is it suitable for club racing use?

Yes. Slot.it lightweight plastic crowns are a common choice in competitive environments where regulations do not require a specific material. Their durability and precise meshing make them reliable in long sessions.

How long does it take to notice wear?

It depends on the lubricant used, the cleanliness of the track, and the load of use. With regular maintenance —cleaning and periodic lubrication— the lifespan is extended. Visually inspect the teeth after each intense running session.

Can I use it in a sidewinder configuration?

Yes, as long as the motor-axle-chassis assembly is designed for that type of mounting and the pinion is compatible. The sidewinder configuration —motor parallel to the rear axle— is perfectly compatible with this crown.

The Slot.it SIGA1629-LPL is a 29-tooth spur gear made of light plastic, featuring M2 hex screw fixing and a 16 mm diameter. Designed for slot car transmission setups where reducing rotational mass is a priority, it delivers crisp throttle response and reliable meshing in club racing and leisure use alike. A precise, lightweight gear upgrade for Slot.it compatible chassis configurations.