27 Inline aluminium crown gear 3/32 balanced EVO3

Precision and balance NSR in every tooth: the 27T Inline EVO3 crown gear for 3/32 pitch

The crown gear NSR6327ALEVO3 is a transmission component made of aluminium by NSR, specifically designed for Inline setups — that is, with the motor in a longitudinal position, parallel to the direction of travel and in line with the rear axle — and with a chain pitch of 3/32. With 27 teeth and the balancing process characteristic of the EVO3 series, this crown gear is aimed at those looking to fine-tune their transmission without sacrificing reliability.

Features and function

• Material: machined aluminium, lighter than plastic and with better heat dissipation during long sessions.
• Number of teeth: 27T, a very common tooth count in configurations balanced between acceleration and top speed.
• Pitch: 3/32, the most widespread standard in competitive slot racing alongside 64 pitch.
• Motor position: Inline. The motor is aligned with the rear axle, lowering the car's centre of gravity and enhancing cornering stability.
• Generation: EVO3, with factory balancing to minimise vibrations and traction loss.

Compatibility and installation

This crown gear is designed to fit NSR chassis with Inline configuration and use 3/32 pitch chain. Before installation, it is advisable to check that the motor pinion is also 3/32 pitch and that the crown-pinion alignment is correct: even minimal misalignment can cause premature wear or loss of efficiency in the transmission.

Aluminium requires careful tightening of the fixing screw; do not overtighten to avoid deforming the material. It is recommended to check the balance after installation if the car is to be used in timed competition.

Track performance

A well-balanced crown gear reduces the micro-play that occurs when a part is not perfectly centred on its axis. In practice, this translates to a more linear response to the trigger of the controller, less heat in the motor, and more consistent traction throughout the lap. The 27 teeth provide an intermediate development point: it is neither the shortest nor the longest crown, making it versatile for different layouts and motors.

Ideal for…

• Club racers competing with NSR Inline chassis who want to optimise their transmission.
• Tuners looking to reduce vibrations without changing the motor or chassis.
• Enthusiasts wanting to replace a worn crown gear while maintaining the same performance.

Frequently asked questions

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

Aluminium is stiffer, dissipates heat generated by chain friction better, and withstands longer sessions more effectively. In return, it requires more care in tightening the fixing screw to avoid deforming the housing.

What does it mean that the crown gear is balanced?

Balancing is a process that verifies and corrects that the weight of the crown gear is evenly distributed around its axis. This eliminates the vibrations that occur when there are imbalances, improving stability and the lifespan of the transmission.

Is it compatible with 64 pitch chains?

No. This crown gear is 3/32 pitch and is only compatible with chains and pinions of the same pitch. Mixing different pitches would cause very rapid wear and improper functioning.

Can I use this crown gear in a Sidewinder or Anglewinder configuration?

The crown gear is designed for Inline. In Sidewinder (transverse motor) or Anglewinder (angled motor) configurations, the chain's attack angle is different and there may be mounting differences. Check compatibility with your specific chassis before installation.

How often should I check or replace the crown gear?

It depends on usage. In competition sessions, it is recommended to check the wear of the teeth every few sessions. Irregular wear or chipped teeth is a sign for immediate replacement to avoid affecting the performance of the motor and chain.

The NSR6327ALEVO3 is a 27-tooth inline aluminium spur gear for 3/32 pitch chain drives, featuring EVO3 balanced design to reduce vibration and improve power delivery. A key upgrade part for NSR inline slot car builds, offering precise meshing, reduced heat and consistent traction on club and competition tracks. Compatible with NSR inline chassis using 3/32 pitch transmission systems.