Removable brass pinion z13 7.5mm M2.5

The removable brass pinion that makes adjusting your transmission hassle-free

The removable brass pinion Z13 7.5 mm M2.5 from Sloting Plus (ref. SP085813) is a transmission component designed for those who prepare and tune their cars with precision. Its fixing system using an M2.5 x 2.5 mm allen grub screw allows for quick installation and removal of the pinion from the 2 mm motor axle, without the need for glue or forcing disassembly.

Features and function

• Material: brass, with better dimensional tolerance and superior durability compared to standard plastic pinions.
• Number of teeth: 13 (Z13).
• Pitch: 7.5 mm.
• Compatible axle diameter: 2 mm (motor axle).
• Fixing: M2.5 x 2.5 mm allen grub screw.
• Contents of the bag: 1 pinion + 2 allen grub screws.
• Chassis material: compatible with steel and duralumin mounts.

Why choose a removable pinion?

The main advantage of the removable system over fixed or glued pinions is the ability to change the gear ratio between sessions without damaging the axle or the pinion itself. Simply loosen the allen grub screw, remove the pinion, and mount another with a different number of teeth to adapt the motor to each track. For clubs or drivers competing on circuits with different characteristics, this detail makes a difference in preparation times.

Compatibility and installation

This pinion is designed for motor axles with a 2 mm diameter. Before installation, ensure that the crown gear you pair it with has an M2 pitch (7.5 mm) to guarantee correct and silent meshing. The included allen grub screw allows for a firm fixing: tighten it with the corresponding allen key until you feel resistance, without over-tightening to avoid damaging the threaded housing.

Brass offers smoother and quieter transmission than plastic pinions, with more gradual and predictable wear over time.

Common mistakes to avoid

• Do not force the grub screw beyond the necessary tightness: brass can deform if pressure is exceeded.
• Check the alignment of the pinion with the crown gear before final tightening, to avoid vibrations and premature wear.
• Ensure that the pitch of the crown gear matches that of the pinion (7.5 mm) before installation.

Frequently asked questions

What axle diameter is this pinion designed for?

It is designed for 2 mm diameter motor axles, the most common standard in competitive and prepared slot cars.

Is the allen grub screw included?

Yes. Each pack includes 1 pinion and 2 M2.5 x 2.5 mm allen grub screws, so you have a spare available from the very beginning.

What advantage does brass have over plastic?

Brass provides greater dimensional rigidity, less deformation from heat, and smoother transmission. Additionally, its wear is slower and more progressive, making it easier to monitor the condition of the part.

What type of crown gear should it be paired with?

It should be used with crown gears of 7.5 mm pitch (M2) to ensure correct meshing. Always check the pitch of the crown gear before mounting the pinion.

Can it be used on steel and duralumin chassis?

Yes, according to the manufacturer's information, it is compatible with both steel and duralumin mounts.

The Sloting Plus SP085813 is a 13-tooth brass removable pinion gear with 7.5 mm pitch, designed for 2 mm motor axles and secured with an M2.5 x 2.5 mm allen grub screw. Each pack includes one pinion and two grub screws. Ideal for slot car builders and club racers looking for a reliable, easy-to-swap transmission component compatible with steel and duralumin chassis setups.