Firestone Coil-Rite Air Spring Kit | Rear

SKU 4121

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Firestone 4121 Coil-Rite air spring kit fits rear applications for the Land Rover Defender 90, Discovery and Range Rover. Firestone air bags are designed to keep your leaf springs from permanent sagging, reduce bottoming out and reduce tire wear while improving steering control and braking. Firestone air helper spring can be adjusted to accommodate your load capacity. Backed by a Firestone limited lifetime warranty.

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Product Specs for Firestone W237604121

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Firestone W237604121 Details

Firestone Coil-Rite Air Helper Springs

Firestone air helper springs are designed to fit inside existing coil spring suspensions, creating a variable rate spring. These air helper springs are made of durable, elastic polyurethane providing years of comfort and stability to your vehicle.

Coil-Rite air helper springs provide extra support for coil springs in cars, minivans, vans, light trucks, RVs and SUVs. The complete adjustability of these air helper springs will level your vehicle, provide a smoother ride, more effective braking and handling, even under heavy loading and adverse road conditions.

Firestone's Coil-Rite air helper springs enable adjustment for varying loads and road conditions by inflating or deflating the air helper springs. Spring performance can be altered as easily as inflating a tire. The air springs will support 500-1000 lbs per set.(Note: Do not exceed the vehicle's recommended Gross Vehicle Weight Rating)

firestone coil rite
Features & Benefits of Coil-Rite air helper springs and air bag kits
  • Increase Vehicle Stability
  • Improve steering and balance
  • Improve braking effectiveness
  • Prevent bottoming out
  • Maintain a level vehicle
  • Keep headlights aimed on the road
  • Reduce tire wear

Basic Kit includes everything for a quick installation:

  • 2 Air springs
  • Supports
  • Hardware
  • Air line
  • Separate inflation valves for manual inflation
  • Average Installation time 1 hour

Vehicle Application Guide for Firestone W237604121

The 4121 Firestone Coil-Rite Air Spring Kit | Rear is engineered to work with specific vehicles displayed below. Can't find your vehicle, or need assistance, please give us a call at 1-800-358-4751 or 1-989-755-0561. Browse the category Firestone Coil Rite to view all vehicle makes and models.

YearMakeModelVehicle OptionInstallation Notes
1994 Land Rover Defender 90Fits models with rear coil springs
1995 Land Rover Defender 90Fits models with rear coil springs
1997 Land Rover Defender 90Fits models with rear coil springs
1994 Land Rover DiscoveryFits models with rear coil springs
1995 Land Rover DiscoveryFits models with rear coil springs
1996 Land Rover DiscoveryFits models with rear coil springs
1997 Land Rover DiscoveryFits models with rear coil springs
1998 Land Rover DiscoveryFits models with rear coil springs
1999 Land Rover DiscoveryFits models with rear coil springs
2000 Land Rover DiscoveryFits models with rear coil springs
2001 Land Rover DiscoveryFits models with rear coil springs
2002 Land Rover DiscoveryFits models with rear coil springs
2003 Land Rover DiscoveryFits models with rear coil springs
2004 Land Rover DiscoveryFits models with rear coil springs
1990 Land Rover Range RoverFits models with rear coil springs
1991 Land Rover Range RoverFits models with rear coil springs
1992 Land Rover Range RoverFits models with rear coil springs
1993 Land Rover Range RoverFits models with rear coil springs
1994 Land Rover Range RoverFits models with rear coil springs
1995 Land Rover Range RoverFits models with rear coil springs
1996 Land Rover Range RoverFits models with rear coil springs

Customer Q&A - Firestone W237604121


Hi, I have a Landrover Discovery 1 with a 2" lift, which spacer do I need to use with this kit?

Asked
Firestone Coil-Rite kit 4121 has a bags that are 10 inches long. To be sure which spacer you will need you can measure the inside dimensions of your coil spring and fill the height over 10 inches with a spacer. The coil spring spacers are rubber so you could order one that is slightly taller and trim it down to the size you need.


I have a Land Rover Defender 90 year 2015. Is this the right product code? Best regards.

Asked
This Firestone 4124 is produced for Toyota and Lexus vehicles but it does not show compatibility with and Land Rovers. We currently do not have a listing for a coil airbag kit that is compatible with a 2015 Land Rover Defender but it is possible to order these kits using the dimensions of the coil. Please give us a call at 1-800-358-4751 or email us a truckspring@truckspring.com and we will assist you with finding a kit.


Would this set be suitable for Land Rover Discovery II from 2000 years?

Asked
Firestone kit 4121 fit the 2000 Land Rover Discovery. It fits models sold in North America. The kit has air springs that are 4.75 inches wide and 10.00 inches tall. You can measure the inside diameter of your coil springs to confirm the measurements are similar.


Firestone

Firestone Industrial Products has the largest North American infrastructure of any air spring manufacturer. Their experience and technical innovation dates back to 1938 with a patent for a pneumatic suspension device to be trademarked the Airide spring.

Firestone Industrial Products, a subsidiary of Bridgestone Firestone Diversified Products (BFDP), specializes in air spring manufacturing and technology with a history of more than 65 years of research and development of technologically advanced air springs. With headquarters in Indianapolis, Ind., and six quality certified manufacturing/assembly plants located on four different continents, the company produces suspension products for commercial trucks & trailers, cars, sport utility vehicles, light trucks, minivans, vans and motor homes.  For more information visit Firestone Industrial Products

Firestone HD Air Springs Warranty

2 Year Warranty

Firestone warrants its HD Air Spring products against defects in workmanship or material for a period of 2 years.

What this warranty does not cover

Damage from accidents, corrosion, improper installation, incorrect applications, overloading, and custom applications that are not specified under the OEM cross references. This warranty does not cover loss of freight, loss of profit, equipment, or personal downtime.

You can view the full details of Firestone’s warranty here.

How To Get Service

If your Firestone HD air spring failure results from a manufacturer defect, contact us at Michigan Truck Spring for support. You can contact us by phone at 1-800-358-4751 or by using our contact form.

Firestone Ride-Rite Warranty

Limited Lifetime Warranty

On Air Springs included in Ride-Rite, Sport-Rite, Coil-Rite, and Level-Rite kits.

2 Year Warranty

On brackets and hardware included in Ride-Rite air spring and Ride-Rite compressor kits.

2 Year Warranty

On Work-Rite urethane products.

2 Year Warranty

On Heavy Duty, Xtra Heavy Duty, and Xtreme compressor systems.

1 Year Warranty

On Light Duty and Standard Duty Ride-Rite compressor kits.

Firestone warrants its products against defects in workmanship or material for the above.

What this warranty does not cover

Damage from accidents, corrosion, improper installation, incorrect applications, overloading, and custom applications that are not specified under the OEM cross references. This warranty does not cover loss of freight, loss of profit, equipment, or personal downtime.

You can view the full details of Firestone’s warranty here.

How to get service

If you purchased your air springs in the U.S. or Canada and believe you have a part with a warrantable defect, call Firestone Customer Service at 1-800-888-0650 (option 1 for Ride-Rite, option 1 again, then option 4 for warranty). Representatives are available from 7:30 a.m. to 4:30 p.m. (EST) Monday – Friday.

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