What's the difference between the divorced and coilover rear options on this Nitron Z4 NTR-R3 coilover kit?

Divorced rear springs keep the factory load path intact and cut friction by removing sideload from the damper, and it's the recommended default. The coilover rear mounts spring and damper together.

What kind of adjustment does Nitron offer on the Z4 NTR-R3 coilover kit?

Independent high and low speed compression and rebound adjustment at each corner, giving a wider tuning range than the single combined adjuster on the NTR-R1.

What kind of reservoir does this kit use?

Piggyback reservoirs are treated up front while hose-mounted reservoirs are on the rear coilovers.

Does the kit include adjustable camber plates?

Yes. Every kit ships with adjustable camber plates and spherical top mounts for precise alignment correction, along with race springs.

Does my Z4 need anything extra if it has the factory Adaptive M Suspension?

Yes. G29 models equipped with the factory Adaptive M Suspension need the Nitron Electronic Damping Delete Kit, sold separately, to remove the adaptive dampers without triggering fault codes.

Can custom spring rates be ordered?

Yes. Every kit is custom built to order, and custom spring rates beyond the standard setup are available by contacting us directly.

Description

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BP PRICING DIFFERENCE

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Description

Nitron NTR-R3 Coilover Kit for G29 BMW Z4

This Z4 NTR-R3 coilover kit by Nitron Suspension is built for G29 owners who’ve already sorted the basics and want the kind of independent adjustment that lets a suspension actually be tuned rather than just set once and left alone. The G29 shares its bones with the Toyota Supra, running a strut front end and a multi-link rear on a near-perfect 50:50 weight distribution, and Nitron builds this kit around that layout with a rear suspension choice most single-spec kits don’t offer, a divorced rear spring setup that keeps loads running through the factory-intended paths and cuts sideload-related friction, or a true coilover rear for owners who want spring and damper mounted together. Independent high and low speed compression and rebound adjustment at each corner lets an owner separate how the suspension handles small, fast inputs like pavement texture from how it handles bigger, slower movements like body roll under load, something a combined single-dial adjuster can’t do. Piggyback reservoirs up front and hose-mounted reservoirs in the rear keep oil volume and temperature more consistent than an internal reservoir alone during a long track session or a hard back road run. Every kit includes adjustable camber plates, spherical top mounts, and race springs, and it’s custom built and fully serviceable.

Coilover vs Divorced Rear Suspension

Rear suspension on the Nitron Z4 NTR-R3 coilover kit comes down to a choice between divorced and coilover. The front stays coilover on every build since that’s how the G29’s front strut mounts, but the rear is where the setup changes to match how the car actually gets used. Divorced rear separates the spring from the damper entirely, keeping loads running through the factory-intended paths and cutting the friction that comes from sideload on the damper, and it’s the setup Nitron recommends by default. Coilover rear keeps the spring and damper together as one unit for owners who want that more traditional layout. Nitron offers both because not every Z4 owner wants the same rear suspension packaging, and one configuration doesn’t serve both.

Specialized Bi-Axis Hose Fittings

Nitron machines the rear hose reservoirs on this kit around its own 720-degree Bi-Axis fitting rather than reaching for an off-the-shelf spherical rod end, and it’s the only fitting Nitron uses across its R3 Hose line. A fixed conventional fitting binds up right at the limit of suspension travel, and on a lowered G29 running stiffer springs that’s exactly where the rear hose routing starts fighting back. Because the Bi-Axis fitting rotates freely at both ends of the connection, the hose is free to find its own path through compression and rebound instead of twisting against a fitting that was never built to move with it.

Unique Technology

Nitron builds every shock in their Z4 NTR-R3 coilover kit from precision components that go through a rigorous design and development process before final assembly. Modular construction gives Nitron’s engineers the flexibility to work through this platform properly instead of cutting corners on how parts are made or how they perform together under real load. Everything is machined to tight tolerances and checked individually by trained technicians, and that quality control runs through the whole process rather than sitting at the end of it.
- 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 engineers the NTR-R3 coilover kit around the G29 chassis and its strut front and multi-link rear geometry, not a generic BMW platform assumption carried over from another model. The divorced rear spring option keeps the factory load path intact and reduces friction by removing sideload from the damper, while the coilover rear option available with the Track spring package gives owners who want a more traditional setup that choice instead of a single fixed configuration. Adjustable camber plates and spherical top mounts let an owner correct alignment precisely instead of guessing at spring perch position, and the valving is developed specifically around the G29’s weight distribution and suspension travel instead of treating adjustment as an afterthought.

Features

Piggyback & hose reservoir types
Coilover or divorced rear suspension types
16 clicks of high compression
26 clicks of low compression
24 clicks of rebound
Preload adjuster
3-way independent adjustment
Full alloy body
Consists of 4 coilovers, reservoirs, hoses, and top mounts
Hand made to order

Specifications

Coilover Type: NTR-R3
Adjustment Type: 3-way independent
Adjustment: 16 clicks of high compression / 26 clicks of low compression / 24 clicks of rebound
Reservoir Type:
- Front: Piggyback
- Rear: Hose
Rear Suspension Type:
- Coilover
- Divorced
Droplinks Included: No
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 343lbs/inch (60N/mm)
  - Rear:
    - Coilover: 300lbs/inch (53N/mm)
    - Divorced: 799lbs/inch (140N/mm)

Applications

BMW Z4 sDrive20i: G29 | 2019-2026
BMW Z4 sDrive30i: G29 | 2019-2026
BMW Z4 M40i: G29 | 2020-2026

Other Suspension Kits for G29 Z4

Notes

Models equipped with the factory Adaptive M Suspension will need the Nitron Electronic Damping Delete Kit to remove the factory adaptive dampers without triggering fault codes
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

Frequently Asked Questions

What’s the difference between the divorced and coilover rear options on this Nitron Z4 NTR-R3 coilover kit? Divorced rear springs keep the factory load path intact and cut friction by removing sideload from the damper, and it’s the recommended default. The coilover rear mounts spring and damper together.
What kind of adjustment does Nitron offer on the Z4 NTR-R3 coilover kit? Independent high and low speed compression and rebound adjustment at each corner, giving a wider tuning range than the single combined adjuster on the NTR-R1.
What kind of reservoir does this kit use? Piggyback reservoirs are treated up front while hose-mounted reservoirs are on the rear coilovers.
Does the kit include adjustable camber plates? Yes. Every kit ships with adjustable camber plates and spherical top mounts for precise alignment correction, along with race springs.
Does my Z4 need anything extra if it has the factory Adaptive M Suspension? Yes. G29 models equipped with the factory Adaptive M Suspension need the Nitron Electronic Damping Delete Kit, sold separately, to remove the adaptive dampers without triggering fault codes.
Can custom spring rates be ordered? Yes. Every kit is custom built to order, and custom spring rates beyond the standard setup are available by contacting us directly.

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-R3 Coilover Kit for G29 BMW Z4 [NTCBM039R3]

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Nitron NTR-R3 Coilover Kit for G29 BMW Z4

Coilover vs Divorced Rear Suspension

Specialized Bi-Axis Hose Fittings

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for G29 Z4

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews