Overview
The Firestone Ride-Rite Coil-Rite rear air helper spring kit, model 4135, is an in-coil air helper kit rated at 500 lbs per pair. It is built for coil sprung vehicles and adds leveling through coil type air bags.
It is a medium duty, air adjustable kit with polyurethane helper springs. Leveling the rear can support stability, steering and braking, reduce tire wear, and keep headlights aimed at the road.
Key features
- In coil system for coil sprung vehicles
- 500 lbs of load leveling capacity per pair
- Air adjustable polyurethane helper springs
- No drilling required
- Manual inflation
- Not compatible with lift kits or height sensors
- Benefits listed include stability, braking, steering and tire wear
Before mounting in-coil bags
In-coil air helpers sit inside the coil spring, so the free space around the spring is the first thing to measure. Look for rubbing against the spring pocket, the shock body or nearby brake lines once the bag is in. The bag should sit centered and not press on the spring coil wall at full compression.
Polyurethane helper springs hold their shape well, but they still wear. Inspect the bags for cuts, bulges and cracks each time you check the fittings, and make sure the inflation valve seals properly. Manual inflation means you set the pressure by hand, so keep a gauge handy whenever you adjust for a load.
- Measure coil clearance before mounting
- Check the bag for rubbing after the first drive
- Keep a gauge with you when adjusting pressure
- Inspect valves and fittings for leaks
Specifications
| Brand | Firestone Ride-Rite |
|---|---|
| Model number | 4135 |
| UPC | 767555097724 |
| System type | In coil |
| Load capacity | 500 lbs per pair |
| Bag type | Coil type bag |
| Duty | Medium duty |
| Installation | No drilling required |
| Inflation method | Manual |
| Height sensor | Not compatible |
| Lift kit compatibility | No |
| Compressor and gauges | Sold separately |
Vehicle fitment
The kit is made for coil sprung vehicles and adds extra leveling through coil type air bags. Confirm the year, model and trim against your vehicle before ordering.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
This is an in coil system, so confirm the coil spring has room for the bag before mounting. The kit is not lift compatible and does not work with a height sensor, so do not plan a lifted or sensor-controlled setup around it.
What’s included
Contents are not broken out.
Not included: the air compressor and gauges, which are sold separately.
