11-tooth inline pinion 5.5mm (X2)

The right pinion for your inline setup, with the precision demanded by Slot.it

When we talk about transmission in competitive slot racing, every tooth counts. The SIPI11 pinion from Slot.it is designed for setups with the motor in an inline position — that is, with the motor arranged longitudinally, in line with the rear axle — a configuration that favours a lower centre of gravity and more stable cornering behaviour.

With 11 teeth and a diameter of 5.5 mm, this pinion is part of Slot.it's extensive transmission system, designed to allow the tuner to adjust the gear ratio precisely and adapt it to the track, the motor, and the driving style.

Main features

• Reference: SIPI11
• Number of teeth: 11
• Diameter: 5.5 mm
• Configuration: Inline motor (longitudinal)
• Pack contents: 2 units
• Manufacturer: Slot.it

Function and performance

The pinion is one of the most critical links in the kinematic chain of a slot car. Its function is to transmit the motor's rotation to the crown gear and, from there, to the rear axle. An 11-tooth pinion offers a gear ratio that, combined with different crowns from the Slot.it catalogue, allows for adjustments to both top speed and torque available out of corners.

Slot.it manufactures its pinions with tight tolerances to ensure a clean mesh, without unnecessary play that could generate vibrations or premature wear. The result is a smooth and efficient transmission, particularly relevant in club racing or in setups where maximum reproducible performance is sought.

Compatibility and installation

This pinion is designed for motors in an inline position. Before purchasing, check that the diameter of your motor shaft is compatible with the pinion hole. Always consult the technical catalogue of Slot.it or the specifications of the motor you intend to use to ensure that the combination is correct.

For installation, it is recommended to use specific pinion adjustment tools to ensure concentricity and avoid the pinion being misaligned, which would cause irregular meshing with the crown gear.

Preparation and tuning

Once installed, check that the play between the pinion and crown gear is appropriate: neither too tight — which would generate friction and heat — nor with excessive play — which would produce noise and loss of efficiency. A light layer of specific slot transmission lubricant applied precisely will extend the lifespan of the assembly.

The fact that the pack includes 2 units is practical for having a spare on hand as well as for equipping two cars with the same gear ratio and facilitating comparisons on the track.

Frequently asked questions

What type of setup is this pinion indicated for?

It is designed for motors in an inline configuration, where the motor is positioned longitudinally relative to the rear axle of the car. It is not suitable for sidewinder or anglewinder setups without first verifying geometric compatibility.

Which Slot.it crowns is it compatible with?

The SIPI11 pinion is compatible with the crowns from the Slot.it transmission system. Consult the Slot.it catalogue or contact us to confirm the pinion-crown combination that best suits your motor and track.

How many units does the pack include?

The pack contains 2 units of the 11-tooth pinion with a 5.5 mm diameter.

How does the number of teeth affect the car's behaviour?

A pinion with fewer teeth, combined with a large crown, offers more torque and better acceleration but limits top speed. If combined with a smaller crown, top speed increases at the cost of some traction. The correct adjustment depends on the type of circuit and the motor used.

Is any special tool required for installation?

It is recommended to use a specific pinion puller or inserter for slot to ensure a centred installation without damaging the motor shaft or the pinion itself.

The Slot.it SIPI11 is an 11-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 ensures precise and efficient power transmission from motor to rear axle. Compatible with Slot.it's transmission system, this pinion is a key component for club racers and performance builders looking to fine-tune gear ratios for any track layout.