Spring stops for progressive suspension 10 pcs

The progressive suspension of NSR begins with perfect spring guiding.

Function and performance

These plastic stops for progressive suspension — reference NSR4886 — have a specific and critical purpose: to serve as a base and guide for the springs installed in NSR motor mounts, ensuring that all compression and extension travel occurs strictly vertically. When the spring works twisted or with lateral movement, the chassis loses predictability: the rear end becomes twitchy, traction on corner exit decreases, and rebounds on abrupt track sections are amplified. With these cups in place, each oscillation of the spring follows the correct axis, and the car's behaviour becomes smooth, progressive, and repeatable lap after lap.

Compatibility

The NSR4886 cups are specifically developed for the new NSR motor mounts, including those designed for the Hypercar category bodies of the brand. If you are building or adjusting a chassis with a next-generation NSR mount, this is the correct spare part to complete the suspension set.

Before placing your order, check that your NSR motor mount is compatible with this reference by consulting the official catalogue or the exploded view of your chassis.

Assembly and preparation

The installation is straightforward: the cups fit into the chassis seats without the need for special tools. The adjustment is millimetric, ensuring that the spring is centred from the very first moment. As it is a pack of 10 units, you have enough material to equip several motor mounts at once or to keep spares in your toolbox during race days.

Common mistakes

• Installing the suspension without a cup: the spring works at an angle and generates uneven wear, in addition to reducing the effectiveness of the entire rear geometry.
• Reusing deformed cups: the plastic can fatigue after many hours of intensive use; replacing them regularly is part of preventive maintenance.
• Confusing this reference with stops for old mounts: NSR4886 is designed for next-generation mounts; check compatibility before installation.

Frequently asked questions

Which NSR mounts are these cups valid for?

They are designed for the new NSR motor mounts, especially those developed for the brand's Hypercar bodies. Consult the NSR catalogue or the exploded view of your chassis to confirm compatibility with your specific mount.

How many units does the pack include and how many cars does it cover?

The pack contains 10 units. The exact number of cups per mount depends on the design of the support; with 10 pieces, you have material to equip several sets or have spares ready for endurance races.

Is the difference noticeable immediately after installation?

Generally yes, especially on tracks with irregularities or club layouts with technical sections. The improvement is perceived as greater stability in corners and less bouncing when accelerating hard on straights.

Is it necessary to change them periodically?

The high-density plastic used by NSR is durable, but in intense competition, it is advisable to check the cups and replace them if they show deformation or signs of wear, as deteriorated guiding negates the benefit of the progressive suspension.

Can they be used with springs from other manufacturers?

The cups are sized for the springs that NSR specifies for these mounts. Using them with springs of different diameter or pitch may compromise the guiding; always check dimensional compatibility before combining components.

NSR4886 plastic spring cups for progressive suspension systems — compatible with new-generation NSR motor supports including Hypercar category mounts. Pack of 10 units. Ensures perfectly vertical spring travel, eliminates lateral flex and parasitic movement for a predictable, smooth rear end on slot car racing chassis. Essential spare part for club racing and high-performance 1/32 scale slot car tuning.