Firestone Coil-Rite: 4121 Rear Kit






Maintain a balanced load and a smooth ride. Get Coil-Rite air springs for your Land Rover Defender 90, Discovery, or Range Rover.

Available To Purchase Online
Where To Buy

Details & Benefits

  • Designed to work in temperatures between -40˚F (-40˚C) and 180˚F (82˚C)
  • Easily control air pressure in the air springs for varying loads and conditions
  • Spring performance can be altered as easily as inflating a tire
  • Made of durable, elastic polyurethane
  • Fill kit

    fill kit


  • load capacity

    load capacity


  • installation


    No Drill

  • in-bed hitch


    Not Compatible

  • min. air pressure

    minimum air pressure

    5 PSI

  • max air pressure

    maximum air pressure

    35 PSI

  • install time

    install time

    1 HOUR(s)

Air Accessory Systems

2158 Single Path Analog Standard Duty 2497
2178 Dual Path Ananlog Standard Duty 2497
2097 Single Path Analog Heavy Duty 2497
2219 Dual Path Analog Heavy Duty 2497
2543 Single Path Analog Extreme Duty With Tank 2530
2549 Dual Path Analog Extreme Duty With Tank 2530
2610 Single Path Wireless (App Only) Standard Duty 2640
2626 Single Path Wireless (App Only) Heavy Duty 2640
2629 Dual Path Wireless (App Only) Standard Duty 2640
2630 Dual Path Wireless (App Only) Heavy Duty 2640
2631 Dual Path Wireless (App Only) Extreme Duty With Tank 2641
2632 Dual Path Wireless (Remote & App ) Standard Duty 2640
2633 Dual Path Wireless (Remote & App ) Heavy Duty 2640
2634 Dual Path Wireless (Remote & App ) Extreme Duty With Tank 2641
2638 Single Path Wireless (Remote & App) Standard Duty 2640
2639 Single Path Wireless (Remote & App ) Heavy Duty 2640

Vehicles Compatible with 4121


Defender 90 (1990-1997)

1990 Defender 90
1991 Defender 90
1992 Defender 90
1993 Defender 90
1994 Defender 90
1995 Defender 90
1996 Defender 90
1997 Defender 90

Discovery (1990-2004)

Exception Warning With rear coil springs only
1990 Discovery
1991 Discovery
1992 Discovery
1993 Discovery
1994 Discovery
1995 Discovery
1996 Discovery
1997 Discovery
1998 Discovery
1999 Discovery
2000 Discovery
2001 Discovery
2002 Discovery
2003 Discovery
2004 Discovery

Range Rover (1990-1996)

1990 Range Rover
1991 Range Rover
1992 Range Rover
1993 Range Rover
1994 Range Rover
1995 Range Rover
1996 Range Rover

What's Included

Everything is included for a quick, easy installation.

  • Air springs
  • Hardware
  • Air line and separate valves for manual inflation, the same as you would use for inflating a tire

Optional air accessories are available for all applications. 

Additional Info

Every load and road is different. That's one reason we designed Coil-Rite air springs. Coil-Rite technology balances your Land Rover Defender 90, Discovery, or Range Rover to promote more effective handling and braking, even when driving in unfavorable road conditions or towing a heavy trailer. In turn, Coil-Rite SUV air springs also help level headlight beams and promote even tire wear.

Most SUVs with coil spring suspensions can take advantage of Coil-Rite air helper springs. They sit inside your existing coil springs to create a variable spring rate. Variable spring rates lead to a slower spring rate in unloaded conditions and a higher spring rate in loaded conditions. What's the benefit? A better ride for all those inside your Land Rover, and more support and control as you take on new roads and adventures.

Is Firestone Coil-Rite installation pretty straightforward? Yes. Land Rover Coil-Rite air spring kits are packed with all the necessary parts for a fast, trouble-free installation. Install time averages one to two hours, and most Firestone Coil-Rite kits are no-drill. Coil-Rite air helper springs are manufactured out of elastic polyurethane and fasten to your Land Rover's current spring seats. Air compressors, air tanks, gauges, and switches are sold separately. Purchase additional air accessories for your Land Rover to monitor and adjust your SUV air springs from inside your vehicle.

Once installed, your Land Rover Coil-Rite air springs are easy to adjust so you can maintain ride comfort and a centered load. A centered load reduces body roll to enhance vehicle stability. By absorbing road shock and softening the interaction between your SUV's axles and frame, Coil-Rite air springs help prevent bottoming out.

With Coil-Rite air springs, changing seasons won't block you from hauling what you need to haul. Coil-Rite air springs were designed to work in temperatures between -40F (-40C) and 180F (82C). North or south, summer or winter— drive your Land Rover where you want.

For your safety, remember that Land Rover Coil-Rite air springs will not increase your vehicle's weight-carrying capacity. Review your Land Rover owner's manual for vehicle-specific recommendations before hauling or towing any size load.

Point your dash in the direction of an authorized Coil-Rite retailer and get your Land Rover Firestone Coil-Rite air spring kit.