Removable Pinion 13d. M50 ø7.5mm in Brass

Adjust your gear ratio with the removable brass pinion SC-1073A75

The pinion is one of the most decisive components in the transmission system of a slot car. Changing the number of teeth or the module allows for direct modification of the gear ratio: more top speed, greater acceleration, or a balance between both depending on the circuit and driving style. This Removable Pinion 13 teeth, Module 50, ø7.5mm in brass with reference SC-1073A75 is designed for those who pay attention to every mechanical detail of their setup.

Features and technical specifications

• Reference: SC-1073A75
• Number of teeth: 13
• Module: 50 (M50)
• Outer diameter: 7.5 mm
• Material: Brass
• Compatible axle diameter: 2 mm
• Fixing system: M2.5 mm screw
• Type: Removable

Function and performance

Brass is a widely valued material in slot transmission parts due to its good wear resistance, precise machining, and stable performance under load. A well-fitted brass pinion transmits the motor's rotation to the crown gear smoothly, reducing mechanical noise and minimizing efficiency losses.

With 13 teeth and module 50, this pinion is aimed at transmission setups seeking a balance between acceleration and speed. Combined with the appropriate crown gear, it allows for fine-tuning the gear ratio according to the layout: circuits with many tight corners benefit from shorter ratios, while fast tracks with long straights accommodate longer ratios.

Compatibility and installation

This pinion is designed for 2 mm diameter axles, a widely adopted standard in motors and transmission assemblies of competitive slot cars. The fixing is done using an M2.5 mm screw, ensuring a solid hold and allowing for easy removal and replacement of the pinion during setup sessions or between heats.

Being removable greatly facilitates bench work: it can be replaced with another pinion of a different number of teeth of the same module without the need to disassemble the entire rear end. This is particularly useful when wanting to quickly and cleanly test different transmission configurations.

Installation and preparation: recommendations

• Before installation, ensure that the axle is clean and free of burrs to guarantee the correct centering of the pinion.
• Tighten the fixing screw with the appropriate tool, without exceeding the torque: brass is hard but the screw can damage the axle if over-tightened.
• Check the play between the pinion and crown gear once installed: neither too tight (causes friction and heat) nor too loose (produces noise and premature wear).
• Apply a minimal amount of specific slot transmission lubricant to the flanks of the teeth to prolong the lifespan of the assembly.

Frequently asked questions

What module crown should I combine with this pinion?

Being module 50 (M50), it must be combined with a crown of the same module. Mixing different modules causes incorrect meshing, accelerated wear, and power loss.

Is this pinion suitable for any slot motor with a 2 mm axle?

In principle, yes, as long as the motor's axle is 2 mm in diameter. However, it is advisable to verify that there is sufficient physical space in the chassis to accommodate the pinion and that the motor's position allows for proper alignment with the crown gear.

What is the difference between a removable pinion and a pressed one?

A removable pinion incorporates a fixing screw that allows it to be mounted and dismounted without special tools or presses. This facilitates quick gear ratio changes without the risk of damaging the axle.

Can I use this pinion in Sidewinder, Inline, and Anglewinder configurations?

Yes. The type of motor configuration (Sidewinder, Inline, or Anglewinder) does not condition the use of the pinion per se, but rather the position of the motor relative to the rear axle. What determines compatibility is the axle diameter (2 mm) and the module of the crown gear (M50).

Is brass better than plastic for a slot pinion?

In general, brass offers greater durability and dimensional precision than plastic under intensive use conditions. For drivers who prepare competition cars or have many sessions, brass is the usual choice due to its longer lifespan and lower deformation with heat.

The SC-1073A75 is a removable brass pinion gear, 13 teeth, module 50, 7.5mm diameter, compatible with 2mm axles and secured with an M2.5mm screw. A precision transmission component for slot car racing, ideal for fine-tuning gear ratios on club circuits. Compatible with inline, sidewinder and anglewinder motor configurations using standard 2mm rear axles.