Crown gear in line 28z

Inline crown gear 28 teeth: precise transmission for longitudinal setups

The AV20635 crown gear from Avant Slot is a transmission component specifically designed for inline configurations, meaning the motor is arranged in line and perpendicular to the rear axle. With 28 teeth and a bore for a 2.38 mm axle, this replacement part fits directly and securely thanks to its M2.5 screw anchoring, which is included in the pack.

Function and technical characteristics

• Number of teeth: 28z
• Compatible axle diameter: 2.38 mm
• Fixing system: M2.5 screw (included)
• Configuration: inline (longitudinal motor, in line with the car)
• Reference: AV20635
• Brand: Avant Slot

Transmission behaviour

The number of teeth on the crown gear directly determines the car's gear ratio: the more teeth the crown has compared to the pinion, the more torque is available at the expense of some top speed. A 28-tooth crown gear offers a versatile balance, suitable for a wide variety of tracks and common pinion ratios in competitive and tuning slot racing.

The M2.5 screw anchoring ensures a firm attachment that prevents slippage on the axle during the race, which is especially critical in inline configurations where the transmission forces act directly on the crown gear.

Compatibility and installation

This crown gear is designed for 2.38 mm axles, a widely used standard size in tuning slot racing. Before installation, it is advisable to verify that your chassis axle corresponds to this size and that the motor pinion is compatible with the crown gear's module. The included M2.5 screw facilitates installation without the need to source additional hardware.

Ideal for…

• Tuners working with inline chassis configurations who need to adjust the gear ratio.
• Replacement of worn or damaged crown gears in Avant Slot cars with 2.38 mm axles.
• Experimenting with different pinion/crown ratios to optimise performance on various circuits.

Considerations

Remember to check the module of your pinion before combining transmission parts. A crown gear and a pinion with different modules will not mesh correctly, which can lead to accelerated wear or loss of traction. If in doubt, consult the reference of your current pinion before placing an order.

Frequently asked questions

What is the difference between an inline crown gear and a sidewinder?

The term refers to the position of the motor relative to the rear axle. In an inline configuration, the motor is in line with the axle (longitudinal), and the crown gear directly transmits the rotation. In a sidewinder, the motor is parallel to the axle (transversal). Each configuration requires a specific crown gear according to the chassis geometry.

Is the M2.5 screw included?

Yes, according to the product description, the M2.5 screw necessary for anchoring the crown gear to the axle is included.

Can I use this crown gear with any pinion on the market?

Only if the module of the pinion matches that of this crown gear. Mixing different modules results in poor meshing. Be sure to check the module before combining parts from different manufacturers.

What axle diameter is it designed for?

For 2.38 mm axles, a very common size in tuning slot racing and Avant Slot chassis.

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

It has 28 teeth. Combined with the motor pinion, it determines the gear ratio: more teeth on the crown compared to the pinion means more torque and less top speed; fewer teeth mean more speed and less torque. Adjusting this ratio is key to optimising the car for the circuit.

The Avant Slot AV20635 is a 28-tooth inline crown gear for 2.38 mm axles, secured with an included M2.5 screw. Designed for inline motor configurations in slot car racing, it delivers reliable and precise power transmission. A must-have spare part for slot car builders and tuners looking to fine-tune their drivetrain ratio for club racing or competitive events.