Sidewinder crown gear 36t

The NSR Sidewinder 36t Crown Gear: Total Control Over Transmission

When it comes to adjusting the gear ratio in a sidewinder setup —motor positioned parallel to the rear axle— the choice of crown gear makes the difference between a car that runs smoothly and one that does not respond as expected. This 36-tooth crown gear from NSR (reference NSR6136) is specifically designed for sidewinder configurations and fits on axles with a 2.38 mm diameter, featuring a crown diameter of 18.5 mm.

Main Features

• Number of Teeth: 36t
• Crown Diameter: 18.5 mm
• Axle Diameter: 2.38 mm
• Mounting Type: Sidewinder (motor parallel to the rear axle)
• Declared Compatibility: Scalextric, Fly, and Sloter

Function and Performance

A 36-tooth crown gear implies a higher reduction ratio than, for example, a 27 or 30t crown. This results in a more progressive start, greater torque at low speeds, and more controllable driving on technical tracks or those with many chicanes. For circuits with long straights where top speed is a priority, it can be combined with larger pinions to compensate.

The NSR manufacturing guarantees the dimensional precision standard that the brand applies to its entire range of spare parts: clean fit to the axle, uniform tooth profile, and careful coaxiality to minimize vibrations and premature wear of the pinion.

Compatibility and Installation

This crown gear is compatible with Scalextric, Fly, and Sloter chassis that use a 2.38 mm rear axle in a sidewinder configuration. Before installation, it is advisable to check the exact diameter of the vehicle's axle and the clearance between the axle and the motor to ensure that the tooth module meshes correctly with the installed pinion.

Installation is done by pressing the crown gear onto the axle until the correct seating is achieved. It is recommended to check the lateral play and the pinion-crown alignment with the car on the bench before going on track, to avoid noise or tooth skipping during the session.

Common Mistakes

• Installing the crown gear on an axle with a diameter different from 2.38 mm: it may be loose or not fit, causing slipping or locking.
• Not checking the lateral alignment with the pinion: this generates asymmetric wear and loss of efficiency in the transmission.
• Combining different tooth modules between crown and pinion: the teeth do not mesh well, and the transmission loses smoothness and performance.

Frequently Asked Questions

Is this crown suitable for an inline configuration?

No, it is not intended for that. In an inline configuration, the motor is positioned in line with the rear axle (perpendicular to it), which requires crowns with specific geometry for that setup. This NSR6136 crown is designed for sidewinder, where the motor is parallel to the rear axle.

What pinion should I combine with a 36-tooth crown?

It depends on the gear ratio you are looking for and the tooth module. The important thing is that the pinion has the same module as the crown for proper meshing. NSR offers a wide range of compatible pinions; consult the combination according to the motor and the track where you will be racing.

Does the 18.5 mm diameter affect chassis height?

Indirectly, yes. The diameter of the crown influences the distance between the centre of the axle and the lowest point of the transmission, which can have a slight effect on the chassis ground clearance. With larger diameter crowns, it is advisable to check for any contact with the body or chassis in flex areas.

Is it necessary to lubricate the crown?

A small amount of specific slot gear lubricant on the teeth improves the smoothness of the transmission and extends the lifespan of the crown and pinion. Apply sparingly: excess lubricant can attract dirt and deteriorate the braids or the motor.

How many units does the product include?

The available information does not specify the number of units per reference. Please check the product sheet or contact us before placing your order if you need confirmation.

The NSR6136 is a 36-tooth sidewinder crown gear designed for 2.38 mm rear axles, with an 18.5 mm diameter. Compatible with Scalextric, Fly, and Sloter slot car chassis, it offers smooth power transmission and reliable engagement for club racing and hobbyist builds. A precise, durable NSR replacement part for sidewinder slot car setups.