29Z crown gear aluminium insert

Inline transmission with the precision demanded by competition: Slot.it 29Z crown gear in aluminium

The SIGI29-AL crown gear from Slot.it is a component designed for setups in inline configuration —longitudinal motor, in line with the car— where the correct meshing between pinion and crown gear is crucial for track response. With 29 teeth and an insert made of aluminium, it combines lightness and rigidity in a compact piece.

Main features

• 29 teeth: standard Slot.it tooth profile, compatible with pinions from the same family.
• Aluminium insert: reduces weight compared to plastic or nylon versions, improving rotational inertia.
• Axle diameter: 2.38 mm, the most common in Slot.it kits and chassis.
• Designed for inline configuration (motor perpendicular to the rear axle, oriented longitudinally).

Compatibility and installation

This crown gear fits directly onto the 2.38 mm rear axles found in most Slot.it kits and chassis. It is essential to pair it with the appropriate pinion according to the motor's rpm and the gear ratio you seek for the track you are competing on. In inline configuration, the alignment between pinion and crown gear is critical: a slight lateral misalignment can cause premature wear and loss of efficiency.

Function and performance

The aluminium insert is not a minor detail. Compared to plastic crowns, the aluminium version offers greater structural rigidity, less deformation under load, and a longer lifespan during intense running sessions. At the same time, aluminium provides slightly better thermal dissipation in environments where the motor operates at high temperatures. The result is a cleaner and more consistent transmission.

Common mistakes

• Confusing inline with sidewinder: this crown is designed for inline motors (longitudinal). In a sidewinder configuration (transverse motor, parallel to the axle), the gear geometry is different.
• Not checking the gear ratio: 29 teeth is a specific value; ensure that the chosen pinion provides the appropriate ratio for your circuit.
• Excessive tightening of the fixing screw: aluminium is softer than steel; over-tightening can damage the insert or deform the axle hole.

Frequently asked questions

What motor configuration is this crown gear intended for?

It is designed for inline setups, meaning the motor is arranged longitudinally (perpendicular to the rear axle). Do not confuse with sidewinder, where the motor is parallel to the rear axle.

What axle diameter do I need to install it?

It requires a 2.38 mm axle, the most common standard in Slot.it kits and chassis.

What advantage does the aluminium insert offer over nylon or plastic?

Aluminium provides greater rigidity, less deformation under load, and better durability in intensive use. Additionally, it slightly reduces weight compared to some versions made from denser materials.

Is it compatible with pinions from other brands?

In principle, it is compatible with pinions that respect the Slot.it tooth module. However, to ensure optimal meshing and avoid irregular wear, it is advisable to use pinions from the same Slot.it family.

How many teeth does it have and how does that affect speed?

It has 29 teeth. The more teeth the crown gear has relative to the pinion, the greater the reduction, and therefore, the higher the torque but lower the top speed. Adjust the ratio according to the type of track: more teeth for technical corners, fewer for fast circuits.

The Slot.it SIGI29-AL is a 29-tooth aluminium insert inline crown gear designed for 2.38 mm axles. A precision slot car part for inline motor setups, offering reduced weight, improved rigidity and consistent power transmission. Compatible with Slot.it inline chassis and kits, ideal for club racing and competitive slot car preparation.