# Spring Rates vs. Approximate Drop in Ride Height

**URL:** <https://forums.speedlife.net/t/spring-rates-vs-approximate-drop-in-ride-height/80200>\
**Category:** SON240sx Automotive\
**Created:** [October 23, 2003, 7:32pm UTC](https://forums.speedlife.net/t/spring-rates-vs-approximate-drop-in-ride-height/80200 "2003-10-23T19:32:10Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\
**Post date:** [October 23, 2003, 7:32pm UTC](https://forums.speedlife.net/t/spring-rates-vs-approximate-drop-in-ride-height/80200/1 "2003-10-23T19:32:10Z")

</div>

lb/in =\> kg/mm: Multiply by 0.01786  
kg/mm =\> lb/in: Multiply by 56

S13 Spring Rates

Stock '92 (from FSM)  
\_ \_ \_Front & Rear: 102 lb/in \_ \_  
\_ \_ \_Front & Rear: 110 lb/in w/ HICAS

Eibach ProKit  
\_ \_ \_Front: \_114-200 lb/in | -1.8"  
\_ \_ \_Rear: \_ 114-148 lb/in | -1.6"

Eibach Sportlines  
\_ \_ \_Front: \_137-230 lb/in | -2.2"  
\_ \_ \_Rear: \_ 128-200 lb/in | -2.1"

JIC FLT-A2  
Front: 8 kg/mm | NA  
Rear: 6 kg/mm | NA

KGMM S21 Sport  
front: 3.2 kg/mm | 179.2 lb/in  
rear: 2.6 kg/mm | 145.6 lb/in

KGMM S21 SuperSport  
front: 4.6 kg/mm | 257.6 lb/in  
rear: 3.8 kg/mm | 212.8 lb/in

KGMM S21 Racing  
front: 6.6 kg/mm | 369.6 lb/in  
rear: 5.2 kg/mm | 291.2 lb/in

Suspension Techniques: 1.3" drop  
\_ \_ \_Front: \_206 lb/in | -1.3"  
\_ \_ \_Rear: \_ 155 lb/in | -1.3"

5Zigen R-Rate  
\_ \_ \_Front = 2.4-5.2 kg/mm | 134-291 lb/in | -1.3"  
\_ \_ \_Rear = \_1.9-5.0 kg/mm | 106-280 lb/in | -1.1"

Tein HA  
\_ \_ \_Front = 6 kg/mm | 336 lb/in  
\_ \_ \_Rear = \_5 kg/mm | 280 lb/in

Tein HE  
\_ \_ \_Front = 8 kg/mm | 448 lb/in  
\_ \_ \_Rear = \_6 kg/mm | 336 lb/in

Tein RA \_  
\_ \_ \_Front = 10 kg/mm | 559 lb/in  
\_ \_ \_Rear = \_ \_8 kg/mm | 448 lb/in

Tein RE  
\_ \_ \_Front = 10 kg/mm | 559 lb/in  
\_ \_ \_Rear = \_ \_8 kg/mm | 448 lb/in

Tein RS  
\_ \_ \_Front = 10 kg/mm | 559 lb/in  
\_ \_ \_Rear = \_ \_8 kg/mm | 448 lb/in

Tein FLEX  
\_ \_ \_Front = 5 kg/mm | 280 lb/in  
\_ \_ \_Rear = \_4 kg/mm | 224 lb/in

Tein S.Tech  
\_ \_ \_Front = 3.2 kg/mm | 179 lb/in  
\_ \_ \_Rear = \_2.9 kg/mm | 162 lb/in

Whiteline  
70055 Front: 155Lbs/in | -35mm  
70049 Back: 165Lbs/in | -40mm

Zeal Function B-6  
Sreet Spec:  
\_ \_ \_Front = 6 kg/mm | 336 lb/in  
\_ \_ \_Rear = 5 kg/mm \_| 280 lb/in  
Circuit Spec:  
\_ \_ \_Front = 8 kg/mm | 448 lb/in  
\_ \_ \_Rear = 7 kg/mm \_| 392 lb/in

S14 Spring Rates

Apexi N-1 Coilovers  
\_ \_ Front = 8 kg/mm | 448 lb/in  
\_ \_ Rear = \_6 kg/mm | 336 lb/in

Eibach ProKit  
\_ \_ \_Front: \_137-228 lb/in | -1.2"  
\_ \_ \_Rear: \_ 114-240 lb/in | -1.0"

Eibach Sportlines  
\_ \_ \_Front: \_109-171 lb/in | -1.7"  
\_ \_ \_Rear: \_ 114-160 lb/in | -1.4"

JIC FLT-A2  
Front: 8 kg/mm | NA  
Rear: 6 kg/mm | NA

kg/mm DR21  
\_ \_ \_Front = 4.8-3.0 kg/mm | 269-168 lb/in  
\_ \_ \_Rear = \_4.0-2.8 kg/mm | 224-157 lb/in

kg/mm DR Racing  
\_ \_ \_Front = 6.6-3.2 kg/mm | 370-179 lb/in  
\_ \_ \_Rear = \_5.2-2.4 kg/mm | 291-134 lb/in

RSR Hard Springs  
\_ \_ \_Front = 5.0 kg/mm | 280 lb/in  
\_ \_ \_Rear = \_4.2 kg/mm | 235 lb/in

TANABE SuperH  
\_ \_ \_Front = 3.0 kg/mm | 168 lb/in | -28mm  
\_ \_ \_Rear = \_4.0 kg/mm | 224 lb/in | -9mm

TRUST Sport Springs  
\_ \_ \_Front = 2.6 kg/mm | 146 lb/in | -25mm  
\_ \_ \_Rear = \_2.6 kg/mm | 146 lb/in | -25mm

HKS Super Sports  
\_ \_ \_Front = 4.14 kg/mm | 232 lb/in  
\_ \_ \_Rear = \_3.46 kg/mm | 194 lb/in

Tein HA kg/mm  
\_ \_ \_Front = 6 kg/mm | 336 lb/in  
\_ \_ \_Rear = \_5 kg/mm | 280 lb/in

Tein HE  
\_ \_ \_Front = 8 kg/mm | 448 lb/in  
\_ \_ \_Rear = \_6 kg/mm | 336 lb/in

Tein RA  
\_ \_ \_Front = 10 kg/mm | 559 lb/in  
\_ \_ \_Rear = \_ \_8 kg/mm | 448 lb/in

Tein RE  
\_ \_ \_Front = 10 kg/mm | 559 lb/in  
\_ \_ \_Rear = \_ \_8 kg/mm | 448 lb/in

Tein RS  
\_ \_ \_Front = 10 kg/mm | 559 lb/in  
\_ \_ \_Rear = \_ \_8 kg/mm | 448 lb/in

Tein FLEX  
\_ \_ \_Front = 6 kg/mm | 336 lb/in  
\_ \_ \_Rear = \_5 kg/mm | 280 lb/in

Tein S.Tech  
\_ \_ \_Front = 4.8 kg/mm | 269 lb/in  
\_ \_ \_Rear = \_4.4 kg/mm | 246 lb/in

Whiteline:  
70055 - front, linear rate 157 lbs/in. | -25-40mm  
70054 - rear, progressive rate 107 \> 178 lbs/in. | -25-40mm

Zeal Function B-6  
Sreet Spec:  
\_ \_ \_Front = 6 kg/mm | 336 lb/in  
\_ \_ \_Rear = \_4 kg/mm | 224 lb/in  
Circuit Spec:  
\_ \_ \_Front = 8 kg/mm | 448 lb/in  
\_ \_ \_Rear = \_6 kg/mm | 336 lb/in