RT-4 spacers

Precision to the tenth of a millimetre for your rear axle setup

The RT-4 Spacers (SC-6533) from Scaleauto are designed for those who know that a slot car's on-track behaviour is determined by the details. A poorly levelled rear axle can result in asymmetric rubbing, loss of traction, or a geometry that does not favour cornering. These spacers allow for precise correction.

Function and performance

The function of these spacers is to adjust the height of the rear axle relative to the chassis, allowing regulation of the distance between the rear wheels and the bottom of the car. This directly influences:

• The weight distribution over the driven wheels.
• The rubbing of the axle against the supports or brackets.
• The contact consistency of the tyres with the track throughout the race.

With adjustment ranges of 0.1 mm and 0.5 mm, the SC-6533 set covers both fine corrections of tenths of a millimetre and broader adjustments when the assembly requires it.

Compatibility

These spacers are designed for use in slot cars for preparation and competition where the rear axle allows this type of adjustment through intercalated spacers in the supports or brackets. Check your chassis technical sheet to confirm compatibility with your specific setup.

Assembly and preparation

The assembly process is straightforward but requires attention:

1. Carefully remove the rear axle from the chassis without forcing the brackets.
2. Intercalate the spacer of the desired thickness at the corresponding support point.
3. Reassemble the axle and check that it rotates freely without excessive lateral play.
4. Verify the levelling and behaviour on the track before finalising the setup.

Working with spacers of different thicknesses on each side of the axle also allows for compensating small manufacturing deviations of the chassis.

Common mistakes

• Mixing thicknesses without recording the setup: Keep a record of which spacer goes in each position to reproduce the setup in future sessions.
• Over-tightening the brackets: This can negate the effect of the spacer and add unnecessary rubbing.
• Not checking lateral play: A spacer that is too thick can create lateral pressure on the axle and increase friction.

Ideal for…

Preparers and club drivers facing championships on Sport track (Scaleauto, Slot.it) who need a repeatable and documented setup. Also for enthusiasts who simply want their car to run with the least friction possible and the greatest stability in braking and acceleration.

Frequently asked questions

What is the difference between using a 0.1 mm spacer and a 0.5 mm one?

The 0.1 mm spacer is used for very fine corrections, typically to compensate for manufacturing tolerances or to adjust the axle height by a tenth. The 0.5 mm spacer offers a more noticeable change in geometry, useful when a more significant adjustment of the axle is needed to accommodate a specific type of tyre or track.

Can multiple spacers be combined to achieve intermediate heights?

Yes, it is common to stack spacers of different thicknesses to reach the exact height value required for the setup. Just ensure that the assembly does not interfere with the free movement of the axle or the closure of the brackets.

Are they exclusive to Scaleauto cars?

They are designed within the Scaleauto ecosystem, but they can be useful in any chassis with compatible geometry supports. Check the dimensions of your chassis before using them on other manufacturers.

How many units are included in the SC-6533 pack?

The provided information does not specify the exact number of units per pack. We recommend checking the official Scaleauto sheet or contacting us before placing your order if this information is crucial for your setup.

Scaleauto SC-6533 RT-4 rear axle height shims — 0.1 mm and 0.5 mm spacers for precise slot car rear axle setup. Designed for Sport track systems, these shims help reduce friction, improve traction consistency and allow repeatable tuning across club racing sessions. Compatible with Scaleauto chassis and other slot car platforms with equivalent axle support geometry.