8-tooth inline pinion 5.5mm (X2)

Slot.it 8-Tooth Inline Pinion: Precision in Transmission, Race After Race

The pinion is one of the components that most influences the actual behaviour of a slot car, and choosing the correct number of teeth makes the difference between speeding down the straight or losing time in corner transitions. This 8-tooth pinion with a 5.5 mm diameter, reference SIPI08 from Slot.it, is specifically designed for inline configurations —that is, with the motor oriented longitudinally, in line with the rear axle of the car—.

Main Features

• Teeth: 8
• Diameter: 5.5 mm
• Configuration: inline (longitudinal motor, in line with the rear axle)
• Units included: 2 pinions per pack
• Reference: SIPI08
• Manufacturer: Slot.it

Function and Performance

The pinion works in tandem with the crown gear to define the car's gear ratio. With 8 teeth, this pinion offers a more direct and aggressive ratio, especially suited for tracks with long straights where maximising the motor's RPM range is desired. In combination with the crown gears from the Slot.it catalogue, it allows the tuner to precisely adjust the traction response.

The fact that the pack includes 2 units is very practical: it allows for a ready spare without the need to place a new order, something that enthusiasts with several cars in simultaneous preparation particularly appreciate.

Compatibility and Installation

This pinion is designed for motors in the inline position. Before installation, it is advisable to check that the inner diameter of the pinion fits the motor shaft used. Slot.it offers pinions in different shaft diameters; consult the complete catalogue to ensure you choose the correct combination with your motor and crown gear.

Installation is straightforward but requires attention: a poorly fitted or misaligned pinion relative to the crown generates noise, premature wear, and loss of efficiency in the transmission. It is recommended to check the lateral play after installation and adjust the motor position if necessary.

Common Mistakes

• Confusing inline configuration with sidewinder: this pinion is for motors oriented longitudinally (inline). For setups with the motor parallel to the rear axle (sidewinder), pinions from a different series are used.
• Not checking the shaft diameter: the diameter of the pinion's inner hole must match that of the motor shaft. Do not assume compatibility without checking.
• Forgetting to check the crown-pinion play: too tight generates friction and heat; too much play causes skipping and uneven wear.

Frequently Asked Questions

What motor configuration is this pinion designed for?

For motors in the inline position, that is, with the motor placed longitudinally and in line with the rear axle of the car. It should not be confused with the sidewinder configuration, where the motor is parallel to the rear axle.

How many pinions are included in the pack?

The pack contains 2 pinions. Ideal for having a spare or for equipping two cars at once.

What gear ratio do I achieve with 8 teeth?

The gear ratio also depends on the number of teeth of the crown gear it is combined with. With 8 teeth on the pinion, the ratio is more direct (more axle revolutions per motor revolution), which favours top speed on long straights. For very tight corners or technical tracks, it may be beneficial to increase the number of teeth on the pinion or change the crown gear.

Is it compatible with any Slot.it motor?

It is designed for the Slot.it range of motors in inline configuration, but it is advisable to verify the inner diameter of the pinion against the diameter of the specific motor shaft you use. Slot.it offers different variants for different shafts.

Which Slot.it crown gears can I combine it with?

It is compatible with the crown gears from the Slot.it catalogue designed for inline transmission. The choice of the number of teeth on the crown determines the final gear ratio. Consult the Slot.it catalogue to find the combination that best suits your track and driving style.

The Slot.it SIPI08 is an 8-tooth inline pinion gear with a 5.5 mm diameter, sold in a pack of 2 units. Designed for inline motor configurations in 1/32 slot car racing, it allows precise gear ratio adjustments when combined with Slot.it crown gears. A reliable and accurate replacement part for club racers and serious slot car enthusiasts looking to fine-tune their drivetrain performance.