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All springs included in our suspension packages are of the finest quality available. Made from chrome silicone / vanadium, each spring is tested and guaranteed to be within 5% of its advertised rate. The powder coat finish protects against corrosion for years of reliable service. The following charts show the available spring rates and recommendations for spring combinations in the various packages listed in this catalog.


SPRING RATE
The RATIO of load to spring deflection is commonly referred to as the spring RATE. FOR EXAMPLE: If a weight of 300 lbs. compresses a spring 1", then the spring compresses at a rate of 1" per 300 lbs. of load. In the case of linear compression springs (as listed above), each equal increment of load will deflect the spring another inch. That is to say (in this case) 600 lbs. will compress the spring 2", etc. In the table above the rate numbers indicate how much weight is required to compress the springs one inch.

WHEEL RATE
The spring rate and the wheel rate are not necessarily the same thing. The wheel rate results from the effect of the suspension geometry on the spring. Usually the suspension links act as levers giving the load a mechanical advantage (or disadvantage as it may be) over the spring. In the case of Chapman or MacPherson struts there is no mechanical advantage to the load as the spring is placing the load directly on the wheel and vice-versa. In mullet-link suspensions and where the spring is mounted to one of the links, this is not the case. Imagine a front suspension lower control arm with the wheel at one end and the spring located exactly half way between the wheel and the control arm pivot at the chassis. When the wheel moves up one inch the spring will only compress one half inch due to the leverage of the control arm, in turn, the spring's effectiveness on the wheel is further divided by the arm's leverage ratio of 2 : 1 making the wheel rate only one quarter of the spring rate. So, the wheel rate is inversely proportional to the spring rate times the control arm ratio, squared. Suffice it to say the closer the spring is to the wheel the more effective it is . This is an important point to note when comparing spring rates from different suspension systems. The spring rate itself is unimportant. It's the wheel rate that influences handling.
All springs included in our suspension packages are of the finest quality available. Made from chrome silicone / vanadium, each spring is tested and guaranteed to be within 5% of its advertised rate. The powder coat finish protects against corrosion for years of reliable service. The following charts show the available spring rates and recommendations for spring combinations in the various packages listed in this catalog.

Table of Available Springs

Spring Length

8"

9"

10"

12"


R
A
T
E
S

A
V
A
I
L
A
B
L
E

250

250

250

250

275

300

275

300

300

350

300

300

325

400

325

325

350

450

350

350

375

500

375

375

400

550

400

400

425

 

425

425

450

 

450

450

475

 

475

475

500

 

500

500

 

 

 

550

 

 

 

600

 

 

 

650

 

 

 

700


 

Part #F002 Coil-over spring 2.5" I.D. X 8" long $60.00 ea
Part #F003 Coil-over spring 2.5" I.D. X (9" 10" & 12" long) $60.00 ea
** 1 7/8 I.D. Available also, please inquire for available lengths and rates.