Removable pinion 12d M50 7.5mm ergal 2mm shaft screw

Transmission Precision: Scaleauto 12d M50 7.5 mm Removable Pinion in Ergal for 2 mm Axle

The pinion is one of the most decisive components in the transmission chain of a slot car. Its module, number of teeth, material, and fixing system directly determine how power from the motor is delivered to the crown gear and, ultimately, to the wheels. This pinion with reference SC-1072E75 from Scaleauto meets the specifications sought by those preparing setups with technical criteria.

Main Features

• Teeth: 12 teeth
• Module: M50 (module 0.50)
• Diameter: 7.5 mm
• Material: Ergal (high-strength, low-density aluminium alloy)
• Compatible Axle: 2 mm
• Fixing System: Screw
• Type: Removable
• Reference: SC-1072E75
• Brand: Scaleauto

Function and Performance

Ergal is the usual choice in competition preparations when seeking to reduce rotating mass without sacrificing durability. Being removable and fixed by a screw, this pinion allows for quick adjustment of the gear ratio between sessions, without the need for complex tools or heating the axle. This is particularly valuable in club or competition days, where pit lane time matters.

With 12 teeth in module M50 and a diameter of 7.5 mm, it fits into the range of small pinions aimed at ratios prioritising top speed, combined with the appropriate crown gear. The choice of the number of teeth on the pinion versus the crown defines the final ratio: it is advisable to plan this pairing before assembly.

Compatibility and Assembly

Designed for 2 mm diameter axles, it is compatible with most inline and sidewinder motor configurations that use this axle standard. Scaleauto employs module M50 throughout its competition transmission line, making it easy to combine pinions and crown gears from the same family without meshing issues.

For correct assembly, it is essential to verify that the pinion is perfectly aligned with the crown before tightening the fixing screw. A slight misalignment introduces vibration and accelerates wear on both parts. Using a dial gauge or at least a magnifying glass during adjustment makes a difference on track.

Common Mistakes

• Over-tightening the screw: this can deform the axle or hinder future disassembly. Tighten firmly but without forcing.
• Not checking the mesh clearance: a mesh that is too tight generates friction; too loose, it causes tooth skipping. Check the lateral play before closing the chassis.
• Mixing different modules: an M50 pinion must always be paired with an M50 crown. Mixing different modules causes premature wear and irregular power delivery.
• Ignoring gear cleanliness: dirt and excess lubricant on the pinion attract dust and deteriorate the mesh. Clean periodically with a fine brush.

Who is this Pinion for?

Ideal for enthusiasts who prepare or refine slot cars for Sport track (Scaleauto, Slot.it) and seek to optimise transmission with quality materials. Also for club preparers who need a reserve of removable pinions to test different gear ratios according to the track layout.

Frequently Asked Questions

Is this pinion compatible with crowns from other brands also in module M50?

In principle, yes: module M50 is a standard, so it should mesh correctly with any M50 crown from other brands. However, it is always advisable to check the quality of the mesh before a competition session, as there may be slight tolerances between manufacturers.

What advantage does ergal have over plastic or brass in a pinion?

Ergal (high-alloy aluminium) combines low density with good mechanical strength. It reduces rotating mass compared to brass — improving motor response — and is more durable than plastic under competition loads.

Can I use this pinion with a sidewinder motor and also with an inline one?

Yes. The type of motorisation (sidewinder or inline) does not affect the module or diameter of the pinion, but rather the orientation of the motor relative to the axle. What determines compatibility is the axle diameter (2 mm in this case) and the module (M50).

How many units does reference SC-1072E75 include?

The available information does not specify the number of units per reference. We recommend checking the product sheet in-store or contacting our team to confirm before placing your order.

What tool do I need to mount and dismount this pinion?

Being removable by screw, generally a hex key of the appropriate size for the fixing screw is sufficient. It is advisable to have a magnifying glass or dial gauge on hand to verify alignment with the crown.

The Scaleauto SC-1072E75 is a 12-tooth M50 module removable pinion gear, 7.5 mm in diameter, machined in ergal aluminium for 2 mm axles with grub screw fixing. A precision slot car transmission component for Sport track systems, designed for club racing and competition setups where low rotational mass and reliable power delivery are essential.