Balanced 25 InLine crown gear 3/32

Inline precision from the first turn: the balanced NSR6325EVO 25-tooth crown gear

The NSR6325EVO is a 25-tooth crown gear in inline format with a 3/32 pitch, manufactured with an ultralight aluminium hub that is factory balanced. It is part of NSR's EVO line, designed for enthusiasts seeking maximum performance without sacrificing ease of assembly.

Technical specifications

• Number of teeth: 25
• Configuration: Inline (longitudinal motor, in line with the rear axle)
• Pitch: 3/32
• Hub material: Aluminium
• Ultralight and balanced hub as standard

Function and performance

In an inline transmission, the motor is positioned longitudinally relative to the rear axle, which helps lower the car's centre of gravity and achieve a more efficient weight distribution. In this context, the crown gear is the final link in that transmission: its balance and dimensional precision directly determine the smoothness of rotation and the absence of vibrations.

The aluminium hub of the NSR6325EVO reduces rotational inertia compared to conventional plastic hubs. Less mass spinning means quicker response to acceleration and braking, which is especially noticeable in competitive setups where every millisecond counts.

The factory balancing eliminates points of uneven mass that generate vibration at high speeds. Less vibration translates to better contact of the braids, greater stability, and reduced wear on the assembly.

Compatibility and assembly

As an inline crown gear with a 3/32 pitch, it is designed to be combined with pinions of the same pitch in setups with the motor in a longitudinal position. NSR offers a wide catalogue of compatible pinions and motors, making it easy to adjust the gear ratio according to the circuit and category regulations.

The machined aluminium hub allows for a firm fit on the rear axle and withstands the usual tightening in competitive setups without deforming.

Ideal for…

• Competitive setups in categories that allow NSR parts.
• Enthusiasts looking to reduce vibrations and improve transmission smoothness.
• Inline preparations where the tooth ratio is key to adjusting top speed or torque in corners.
• Drivers already using NSR products who want to maintain consistency in materials and tolerances.

Points to consider

Always check that the motor pinion is also 3/32 pitch before mounting this crown gear. A mix of pitches causes poor meshing, noise, and premature wear. Also, check the lateral alignment between the crown gear and pinion to ensure clean contact across the entire width of the tooth.

Frequently asked questions

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

The crown gear itself may be physically similar, but its use depends on the motor position. In an inline configuration, the motor is longitudinal (in line with the axle), while in a sidewinder, the motor is parallel (transverse) to the rear axle. This NSR6325EVO crown gear is specifically designed for inline setups.

Does factory balancing mean no additional adjustments are needed?

Factory balancing ensures a superior quality base compared to a standard crown gear, but in high-competition setups, some mechanics perform final balancing after the complete assembly in the car. For club or recreational use, the EVO balancing is more than sufficient.

Which pinions does this crown gear work with?

With any NSR (or compatible) pinion with a 3/32 pitch. NSR offers pinions in various tooth counts to adjust the gear ratio according to the circuit. Check the NSR catalogue for available combinations.

Is it compatible with chassis from other brands?

Yes, as long as the rear axle and motor position are compatible with the inline format and 3/32 pitch. NSR is a common reference in competitive setups mounted on either proprietary or third-party chassis.

How long does an aluminium crown gear last compared to a plastic one?

Aluminium crown gears typically offer greater durability against wear from abrasion but require proper lubrication and alignment. With basic maintenance, the lifespan is significantly longer than that of conventional plastic parts.

The NSR6325EVO is a 25-tooth inline spur gear for 1/32 slot car racing, featuring a 3/32 pitch and an ultralight balanced aluminium hub. Designed for inline motor configurations, it delivers smooth power transmission, reduced rotational inertia and minimal vibration at high speeds. A go-to upgrade for competitive slot car builders looking for precision NSR components.