What's the difference between the divorced and coilover rear options on Nitron's Z4 NTR-R1 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 this Z4 NTR-R1 coilover kit offer?

2-way combined compression and rebound adjustment, letting an owner dial in a range from comfortable street settings to a stiffer track setup.

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 the kit use a remote reservoir?

No. The Nitron Z4 NTR-R1 coilovers use an internal reservoir design with no external hose or piggyback canister.

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

Additional Info

Shipping policy

BP PRICING DIFFERENCE

Reviews

Product Inquiry

Description

Nitron NTR-R1 Coilover Kit for G29 BMW Z4

The Nitron Z4 NTR-R1 coilover kit is built for G29 owners who want to sharpen a chassis that already shares its bones with the Toyota Supra but still rides on a suspension tuned for a broader mix of buyers than the sDrive30i or M40i driver actually wants. The G29 runs 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 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. Two-way combined compression and rebound adjustment lets an owner dial in exactly how the car reacts under braking and through a corner, and the internal reservoir design keeps the kit compact enough to fit inside the factory wheel wells without any external plumbing to route or protect. 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-R1 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.

Unique Technology

Nitron’s Z4 NTR-R1 coilover kit uses 2-way combined adjustment, compression and rebound moving together off a single dial, tuned so an owner gets a real range between a comfortable street setting and a stiffer setup for a track day without hunting through clicks that don’t actually change how the car feels. Everything runs off an internal reservoir, no hose or piggyback canister needed, which keeps the kit self-contained and easier to package around the G29’s factory subframe and multi-link rear geometry.
- 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 their Z4 NTR-R1 coilover kit around this specific 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

Coilover or divorced rear suspension types
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 Types:
- 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.
Precision bearing spacers supplied as required

Frequently Asked Questions

What’s the difference between the divorced and coilover rear options on Nitron’s Z4 NTR-R1 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 this Z4 NTR-R1 coilover kit offer? 2-way combined compression and rebound adjustment, letting an owner dial in a range from comfortable street settings to a stiffer track setup.
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 the kit use a remote reservoir? No. The Nitron Z4 NTR-R1 coilovers use an internal reservoir design with no external hose or piggyback canister.
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.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Product Inquiry

First Name (*required)

Last Name (*required)

Your E-Mail (*required)

Telephone Number (*required)

Country (*required)

Vehicle Year / Make / Model (*required)

Please Explain What do you want to do with your vehicle

Additional Information (optional)

I agree to the terms & conditions and privacy policy and to have Bulletproof Automotive LLC contact me for promotion, marketing and other purposes via email, phone or SMS message.

Nitron NTR-R1 Coilover Kit for G29 BMW Z4 [NTCBM039R1]

Guaranteed Safe Checkout

Nitron NTR-R1 Coilover Kit for G29 BMW Z4

Coilover vs Divorced Rear Suspension

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for G29 Z4

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews