What spring rate options are available for the Alfa Romeo 4C NTR-R1 kit?

Two specs are recommended directly by Nitron and are offered as options, while custom spring rates can be requested. The Fast Road Spec runs 300lbs/inch (53N/mm) front and 400lbs/inch (70N/mm) rear. The Track Day Spec steps up to 375lbs/inch (66N/mm) front and 456lbs/inch (80N/mm) rear. The right choice depends on how the car is used; the Track Day Spec is the better fit if circuit work is a regular part of the picture.

How does the 2-way combined damping adjustment work?

The NTR-R1 uses a single adjuster controlling both bump and rebound together across 24 clicks of combined adjustment. This keeps setup simple without sacrificing the ability to meaningfully tune the damping character for different road conditions or track surfaces.

Are droplinks included with the kit?

No, droplinks are not included. The kit consists of four coilovers and top mounts covering front and rear, with precision bearing spacers supplied as required.

Is the Nitron NTR-R1 serviceable after purchase?

Yes. Every NTR-R1 kit is fully serviceable. Nitron hand-builds each unit to order, and the design supports long-term maintenance rather than requiring full replacement when performance eventually needs refreshing.

Description

Additional Info

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BP PRICING DIFFERENCE

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Description

Nitron NTR-R1 Coilover Kit for 960 Alfa Romeo 4C

The Alfa Romeo 4C has the chassis to be a genuine performance car, but the stock suspension limits what it can actually do when the road gets serious or a track day enters the picture. The Nitron NTR-R1 coilover kit closes that gap with precision-engineered, combined 2-way damping adjustment drawn directly from the R3 race platform, sharing core components with a kit built for professional competition. There’s no remote canister to work around, and every unit is individually hand-built with ultra-low friction components that deliver consistent, fade-resistant damping from the street to the circuit. Hard-anodised titanium finish parts and high-grade materials cut corrosion and unnecessary weight, and with each kit custom built, custom sprung, and fully serviceable, the investment holds up well past a single season.

Unique Technology

Every Nitron shock starts with precision components that have been through a thorough design and development process before they reach final assembly. The modular construction gives engineers the flexibility to tailor each application properly, without compromising how individual parts are made or how they perform together. Components are machined to tight tolerances and inspected one by one by trained technicians as part of a strict quality control process. New materials, finishes, and processes go through extensive validation before adoption, with Nitron-specific technologies integrated to produce shocks that genuinely outlast and outperform competing options on the road and track. That standard of engineering is what Nitron’s reputation is built on.
- Basic Damper Design:
  1. End Eye / Top Mount
  2. Damper Piston & Shim Stack
  3. Shaft / Rod
  4. Floating / Separator Piston
  5. Suspension Oil
  6. Compressed Nitrogen Gas

Bespoke Engineering

Nitron doesn’t pull a generic damper off a shelf and adjust the valving to fit. Every application goes through a dedicated development process, with components, spring rates, and damping characteristics engineered specifically for the platform in question. That means the geometry, weight distribution, and suspension travel of a given car are factored into the design from the start, not compensated for after the fact. It’s the difference between a kit built for your car and a kit built for a category of cars your vehicle happens to fall into.

Features

Internal reservoir type
2-way combined adjustment
Full alloy body
Preload adjuster
Combined 24 clicks of adjustment
Nitrogen gas charged
Precision bearing spacers supplied as required
Consists of 4 coilovers and top mounts
Hand made to order

Specifications

Coilover Type: NTR-R1
Adjustment Type: 2-way combined
Adjustment: 24 clicks combined
Rear Suspension Type: OEM
Droplinks Included: No
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 300lbs/inch (53N/mm)
  - Rear: 400lbs/inch (70N/mm)
- TDS – Track Day Spec:
  - Front: 375lbs/inch (66N/mm)
  - Rear: 456lbs/inch (80N/mm)

Applications

Alfa Romeo 4C: 960 | 2014-2020

Other Suspension Kits for the Alfa Romeo 4C

NTR-R3 Coilover Kit

Notes

Custom spring rates also available, please contact us directly here for more information or for a consultation on custom rates
Images used for illustration purposes only. Specific details, finishes and end fittings may differ from that shown.
Precision bearing spacers supplied as required

Frequently Asked Questions

What spring rate options are available for the Alfa Romeo 4C NTR-R1 kit? Two specs are recommended directly by Nitron and are offered as options, while custom spring rates can be requested. The Fast Road Spec runs 300lbs/inch (53N/mm) front and 400lbs/inch (70N/mm) rear. The Track Day Spec steps up to 375lbs/inch (66N/mm) front and 456lbs/inch (80N/mm) rear. The right choice depends on how the car is used; the Track Day Spec is the better fit if circuit work is a regular part of the picture.
How does the 2-way combined damping adjustment work? The NTR-R1 uses a single adjuster controlling both bump and rebound together across 24 clicks of combined adjustment. This keeps setup simple without sacrificing the ability to meaningfully tune the damping character for different road conditions or track surfaces.
Are droplinks included with the kit? No, droplinks are not included. The kit consists of four coilovers and top mounts covering front and rear, with precision bearing spacers supplied as required.
Is the Nitron NTR-R1 serviceable after purchase? Yes. Every NTR-R1 kit is fully serviceable. Nitron hand-builds each unit to order, and the design supports long-term maintenance rather than requiring full replacement when performance eventually needs refreshing.

About Nitron Suspension

Nitron Suspension has been at the forefront of precision suspension engineering since 1998, founded by Guy Evans with the goal of building high-performance shocks for enthusiasts and professionals alike. Over 200 dealers now carry Nitron products across Europe, Asia, the US, Australasia, and Africa. In 2008, the company moved into a dedicated facility in the UK’s Motorsport Valley, adding dynamometers, 5-axis CNC machines, and 3D CAD capabilities to support both growing demand and continued product development. A second expansion came in 2023 with a new office in Murrieta, California. The team behind every Nitron product draws from deep backgrounds in machining, materials technology, hydraulics, bike engineering, and F1 racing, with many engineers bringing firsthand experience as competitive drivers and riders. That depth of knowledge across both the technical and competitive sides of motorsport shapes every product Nitron develops.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Nitron NTR-R1 Coilover Kit for 960 Alfa Romeo 4C [NTCAL010R1]

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Nitron NTR-R1 Coilover Kit for 960 Alfa Romeo 4C

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for the Alfa Romeo 4C

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews