49mm x 3/32 hollow

NSR Hollow Axle 3/32 x 49 mm: less weight, more response on track

The NSR4871 axle is a rear axle with a length of 49 mm and a diameter of 3/32", manufactured in a hollow format to minimize rotating mass. Weighing just 0.98 g and without magnetic effect, it is designed for competition setups where every tenth of a gram matters.

Main features

• Length: 49 mm
• Diameter: 3/32"
• Construction: hollow
• Weight: 0.98 g
• Magnetic effect: none
• Reference: NSR4871
• Brand: NSR

Function and performance

In a slot car, the rear axle is one of the elements that most influences the inertia of the drivetrain. By opting for a hollow axle instead of a solid one, the rotating mass is directly reduced, resulting in a more agile response to acceleration and cleaner braking when releasing the trigger. The absence of magnetic effect makes it particularly interesting for setups on low-grip tracks or for competition categories that prioritise chassis neutrality.

Compatibility and installation

The 3/32" diameter is one of the most widely used standards in the slot racing world, compatible with the vast majority of crown gears, wheels, and bearings of that pitch. NSR offers a wide catalogue of coordinated spare parts, making it easy to find crown gears, wheels, and supports that work with this axle. Before installation, it is advisable to check the effective length between supports on the chassis to confirm that the 49 mm fits correctly with your vehicle.

Preparation and common mistakes

When installing a hollow axle, it is important to ensure that the bearings or bushings are properly aligned: any angular deviation is more noticeable in a lightweight axle than in a solid one, as the lower inertia amplifies mounting irregularities. It is recommended to check the concentricity of the axle-crown-gear assembly before each relevant session, especially in club competitions. Use an appropriate alignment tool and adjust the collars with the right pressure, without forcing the material.

Ideal for…

• Club racers looking to reduce rotating mass in their setups.
• Inline or sidewinder setups where axle weight directly influences acceleration response.
• Competition categories that restrict or penalise the use of magnetic elements in the drivetrain.
• Enthusiasts wanting to experiment with different weight configurations on the rear axle.

Frequently asked questions

What real advantage does a hollow axle provide over a solid one?

The hollow axle weighs less, reducing the rotating inertia of the rear assembly. In practice, the car responds more quickly to acceleration, and deceleration is more progressive. The difference is particularly noticeable on tracks with many curves and changes of pace.

Does the lack of magnetic effect affect grip on a magnetic track?

Yes, on tracks with magnetic effect, an axle that does not respond to magnets does not contribute to the suction effect. If your track uses magnetic strips and your car takes advantage of that effect to gain grip, this axle does not add to that aspect. For tracks without magnetism or categories that prohibit it, it is a perfect choice.

Which NSR crown gears and wheels is this axle compatible with?

Being 3/32" in diameter, it is compatible with the entire range of NSR crown gears, wheels, and bearings designed for that standard pitch. Check the NSR catalogue to confirm the length and specific fit according to the chassis you are using.

Does it require any special maintenance due to being hollow?

No special maintenance is required compared to any other axle. It is advisable to clean it periodically and check for any deformations at the supports. Being lighter, any minimal bend is more noticeable in performance, so handle it carefully during installation and removal.

Can I use it in an anglewinder setup?

Yes, the diameter and length are the same regardless of the motor configuration. What you need to verify is that the 49 mm length fits with the distance between supports of your specific chassis in that configuration.

The NSR4871 is a 49 mm hollow rear axle in 3/32" diameter, weighing just 0.98 g and featuring no magnetic effect. Designed for slot car competition preparation, it minimizes rotational mass for faster throttle response and cleaner braking. Compatible with the full range of NSR 3/32" gears, wheels and bearings, this axle is a go-to choice for club racers and serious hobbyists looking to fine-tune their drivetrain setup.