Spring Selection Guide
Radflo uses the best Performance Springs on the Market. Eibach products are created to meet the extreme requirements of racing, from the high speed sections of the Baja 1000 to the fender-to-fender combat rocks at the King of the Hammers.
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- Increased Ground Clearance.
- More Fender Clearance for Larger Wheels and Tires.
- Precision Engineered for Improved Off-Road Capability.
- Excellent On-Road Stability and Handling.
- Made in U.S.A.
- Backed by Eibach Million-Mile Warranty
OE Replacement
It is important when choosing the right spring weight to take into consideration if you have added aftermarket front bumpers, rear bumpers, winches, tire carriers and various roof and truck bed accessories that overhang past your suspension.
For instance you have a full size aftermarket steel front bumper, you would want to add 50lbs more to choosing your spring rate. Adding a winch to that bumper would mean you should include an additional 50lb to that spring rate. So if you were to have a standard spring rate of 600lbs, by adding aftermarket parts to the front of the vehicle your (bumper and winch) new spring rate would be 700lbs.
A most common standard truck spring rate is 600lbs while lighter trucks are 550lbs. You must take into factor the engine types like 4-6cyl. The heavier the engine the heavier spring rate is needed.
Off-Raod
On dual rate coilovers, the lower spring should be longer and top shorter. It’s better to have the difference between the two lengths at 4″. For example, a 16″ would have 18″ on bottom and 14″ on top. Doing 18″ and 16″ may be too tall.
Calculating Spring Rates – Droop percentage at ride height calculated like this: 10″ Travel shock sitting at 7″ (so 7″ up and 3″ down) will be 30% droop percentage.
To calculate spring rate size, you will need to know the shock length.
For Example: 2.0 x 16 inch. 16inch travel will be multiplied to 32 for shock spring length. You will always want the heavier spring on the bottom. So you can do two 16inch springs or do an 18 inch and 14inch spring, 18inch spring will always be the heavier spring you will use which will be at the bottom.
Common Spring Selection Chart
|
Vehicle |
Stock |
Bumper or Winch |
Bumper & Winch + |
|
Ford Bronco |
Front 650lb Rear 500/350lb
|
Front 650lb Rear 500/350lb
|
Front 700lb Rear Ask |
|
Chevy ZR2 Diesel |
Front 650lb
|
Front 700lb
|
Front 700lb
|
|
1996-2004 Tacoma |
Front 550lb
|
Front 600lb |
Front 650lb |
|
2006-2012 4Runner (see below)
|
Front 550lb/600lb
|
Front 600lb/650lb
|
Front 650lb/700lb
|
|
All Others
|
Front 600lb
|
Front 650lb
|
Front 700lb
|
|
|
*No increase in rate typically needed for sliders, skid plates, rooftop tents. etc.
*Bumpers are not accounted for if lightweight such as streamline type.
*2006-2002 4Runner – some customers have said the 600lb rate is too stiff and some have suggested lighter, but some haven’t complained.
Radflo Spring Policy
Radflo does not offer a spring exchange program. Many springs are custom made per your order and cannot be returned. Please give us a call 714-965-7828 to further assist you in the right spring selection.