Standard Coilover Springs



Standard Coilover Springs
Increase traction, less un-sprung mass, more stroke, increased handling. The only thing you will be losing is track time.

As you might know, United States are the largest racer populated country in the world. Through our experiences from extensive testing in world class racing in Europe and Asia, we have great confidence that we can provide the same results in the US. Swift specifically designed a standard measurement race springs to accommodate American race industries including oval track racing, and drag racing, and offroad racing.

By knowing the main characteristics that American racer demands, we designed and engineered the standard measurement springs based on data that we had collected through racers that are at the top of their sport. A slight difference in design than our metric coilover springs.

Many enthusiasts will swap springs from brand to brand with the only noticeable difference being a stiffer or softer ride. But what if a spring could offer a noticeable increase in traction, smoother weight transfer, better ride quality, lower tire temperatures, and a more predictable feel? The engineers at Swift have taken that "what if" and turned it into reality.

All Swift Springs are manufactured using H5S.TW. which is far superior to typical silicone chrome steel and allows us to wind a much more responsive spring with less coils, resulting in reduced un-sprung weight and increased stroke.

Most of Swift 10" and longer springs (Excluding the Drag racing springs and Conventional springs) are barrel design; the design is to solve all spring Deflection (bowing) problems. With bowing springs, you can expect spring rate inconsistency, and rubbing against shock body that would lead to damage on the shock adjusting perch thread.

One approach to assess spring deflection would be to increase the number of coils on the springs. With more coils on the spring, you will experience less bowing motion. This is the easy and cheaper method to solve the issue. But the downside of this method is a decrease in spring stroke, increase in un-sprung mass, and will affect the overall movement of other suspension components.

Unlike others, Swift designed barrel springs with ease and consistency of vehicle setup in mind, our barrel springs design have a maximum of 4" outer diameter (except B5 and B3 series)(Usually located on the center coil of the spring). Because most other manufacture do not design their barrel springs with this rule, most of their barrel springs outside diameter will differ from one rate to another. This creates a hard time for racers especially with tight clearances to test and see which rates will fit and which rate does not. A heavier rate spring can interfere with the suspension A-arm or other suspension components.

Bulletproof Series Springs (Parts number ending in BP)
Purpose built for those of you putting more stress on a spring than how is conventionally used. We sought after a new approach in development from our regular suspension spring.

After years of research and development, Swift springs would like to proudly present the BP Spring for circle track racing. Specifically designed to meet and surpass the unique needs of Circle Track Racers. Although specially made, these springs are constructed with the same SWIFT SPRINGS philosophy and that is to be responsive and increase overall traction



8" LENGTH - STRAIGHT TYPE

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
080-188-140 140 4.9 5.4 761
080-188-150 150 4.6 5.6 838
080-188-160 160 4.8 5.3 849
080-188-170 170 4.8 5.2 880
080-188-180 180 4.5 5.3 955
080-188-190 190 4.6 5.2 979
080-188-200 200 4.3 5.3 1,056
080-188-210 210 4.6 5.0 1,056
080-188-220 220 4.3 5.1 1,122
080-188-230 230 4.6 4.8 1,100
080-188-240 240 4.4 4.9 1,177
080-188-250 250 4.2 5.0 1,252
080-188-260 260 4.3 4.8 1,259
080-188-270 270 4.4 4.6 1,257
080-188-280 280 4.2 4.8 1,332
080-188-300 300 4.3 4.5 1,356
080-188-325 325 3.9 4.8 1,545
080-188-350 350 4.0 4.6 1,594



10" LENGTH - STRAIGHT TYPE

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
100-188-100 100 6.1 6.5 655
100-188-110 110 6.1 6.9 752
100-188-120 120 6.2 6.5 785
100-188-130 130 5.7 6.8 882



10" LENGTH - BARREL TYPE (OUTSIDE DIAMETER IS SET AT 3")

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
100-188-100B3 100 6.5 7.5 754
100-188-110B3 110 6.3 7.4 829
100-188-120B3 120 6.2 7.3 877
100-188-130B3 130 6.2 7.0 903
100-188-140B3 140 5.9 7.2 1,009
100-188-150B3 150 6.1 6.9 1,042
100-188-160B3 160 5.7 7.0 1,144
100-188-170B3 170 5.8 6.9 1,157
100-188-180B3 180 5.8 6.7 1,206
100-188-190B3 190 5.9 6.5 1,244
100-188-200B3 200 5.7 6.5 1,317
100-188-220B3 220 5.7 6.4 1,402
100-188-240B3 240 5.6 6.3 1,510
100-188-260B3 260 5.4 6.2 1,612
100-188-280B3 280 5.4 6.1 1,704
100-188-300B3 300 5.1 6.1 1,845
100-188-325B3 325 5.2 5.9 1,905
100-188-350B3 350 5.0 5.7 2,028


DRAG RACE SPECIFIC - STRAIGHT TYPE - 14" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
140-250-095 95 8.5 10.8 1,026
140-250-110 110 8.3 10.6 1,166
140-250-125 125 8.3 10.4 1,300


ID 2.5" - STRAIGHT TYPE - 4" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
040-250-300 300 2.6 2.8 843
040-250-350 350 2.5 2.7 960
040-250-400 400 2.5 2.7 1,066
040-250-450 450 2.4 2.6 1,182
040-250-500 500 2.4 2.6 1,289
040-250-550 550 2.3 2.5 1,388
040-250-600 600 2.3 2.5 1,476


ID 2.5" - STRAIGHT TYPE - 8" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
080-250-200 200 5.1 5.8 1,151
080-250-225 225 4.9 5.7 1,280
080-250-250 250 4.8 5.6 1,402
080-250-275 275 4.7 5.5 1,516
080-250-300 300 4.7 5.4 1,620
080-250-325 325 4.6 5.4 1,748
080-250-350 350 4.6 5.2 1,837
080-250-375 375 4.5 5.2 1,953
080-250-400 400 4.4 5.2 2,066
080-250-425 425 4.3 5.1 2,172
080-250-450 450 4.3 5.1 2,273
080-250-475 475 4.3 5.0 2,371
080-250-500 500 4.2 4.9 2,461
080-250-525 525 4.2 4.8 2,544
080-250-550 550 4.1 4.9 2,679
080-250-600 600 4.0 4.8 2,884
080-250-650 650 4.0 4.6 3,009
080-250-700 700 3.9 4.5 3,180
080-250-750 750 3.8 4.5 3,405
080-250-800 800 3.8 4.4 3,550
080-250-850 850 3.7 4.4 3,758
080-250-900 900 3.7 4.3 3,869
080-250-950 950 3.7 4.2 3,957
080-250-1000 1000 3.6 4.1 4,130


ID 2.5" - BARREL TYPE - 10" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
100-250-100 B 100 7.2 8.6 817
100-250-125 B 125 6.8 8.4 995
100-250-150 B 150 6.8 8.2 1,152
100-250-175 B 175 6.5 8.1 1,323
100-250-185 B 185 6.4 8.1 1,399
100-250-200 B 200 6.4 7.9 1,481
100-250-225 B 225 6.3 7.8 1,625
100-250-250 B 250 6.1 7.7 1,783
100-250-275 B 275 5.9 7.7 1,961
100-250-300 B 300 5.8 7.6 2,101
100-250-325 B 325 5.6 7.5 2,266
100-250-350 B 350 5.6 7.4 2,387
100-250-375 B 375 5.6 7.2 2,494
100-250-400 B 400 5.5 7.1 2,633
100-250-425 B 425 5.4 7.0 2,768
100-250-450 B 450 5.3 7.0 2,895
100-250-475 B 475 5.4 6.8 2,955
100-250-500 B 500 5.3 6.7 3,061
100-250-525 B 525 5.2 6.7 3,231
100-250-550 B 550 5.2 6.6 3,324
100-250-575 B 575 4.9 6.8 3,563
100-250-600 B 600 5.0 6.5 3,565
100-250-650 B 650 4.9 6.2 3,785
100-250-700 B 700 4.8 6.2 4,079
100-250-750 B 750 4.6 6.2 4,355


ID 2.5" - BARREL TYPE - 12" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
120-250-100 B 100 8.5 9.9 954
120-250-125 B 125 8.2 9.8 1,161
120-250-150 B 150 7.8 9.6 1,364
120-250-175 B 175 7.7 9.4 1,547
120-250-185 B 185 7.7 9.2 1,612
120-250-200 B 200 7.5 9.2 1,731
120-250-225 B 225 7.4 9.0 1,902
120-250-250 B 250 7.3 8.8 2,051
120-250-275 B 275 7.1 8.7 2,219
120-250-300 B 300 6.9 8.6 2,420
120-250-325 B 325 6.8 8.4 2,567
120-250-350 B 350 6.6 8.4 2,753
120-250-375 B 375 6.5 8.2 2,873
120-250-400 B 400 6.4 8.1 3,039
120-250-425 B 425 6.3 8.1 3,194
120-250-450 B 450 6.1 8.1 3,414
120-250-475 B 475 6.0 8.1 3,561
120-250-500 B 500 6.0 7.8 3,612
120-250-525 B 525 6.1 7.4 3,644
120-250-550 B 550 5.8 7.6 3,932
120-250-575 B 575 5.8 7.4 4,036
120-250-600 B 600 5.8 7.3 4,124
120-250-650 B 650 5.6 7.2 4,381
120-250-700 B 700 5.6 7.0 4,611
120-250-750 B 750 5.4 7.0 4,937


ID 2.5" - BARREL TYPE - 12" LENGTH PROGRESSIVE

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
120-250-300V 100/300 5.9 6.7 1,448
120-250-500V2 200/500 5.5 5.8 2,070
120-250-500V3 300/500 5.5 6.5 2,682


ID 2.5" - BARREL TYPE - 14" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
140-250-100 BP 100 10.6 10.8 1,082
140-250-125 BP 125 10.3 10.7 1,338
140-250-140 BP 140 10.2 10.6 1,477
140-250-150 BP 150 10.0 10.5 1,570
140-250-165 BP 165 9.8 10.4 1,715
140-250-175 BP 175 9.8 10.3 1,808
140-250-185 BP 185 9.7 10.2 1,889
140-250-200 BP 200 9.7 10.1 2,030
140-250-225 B 225 8.1 10.4 2,209
140-250-250 B 250 7.8 10.3 2,432
140-250-275 B 275 8.0 9.8 2,541
140-250-300 B 300 7.7 9.8 2,777
140-250-325 B 325 7.6 9.6 2,944
140-250-350 B 350 7.3 9.5 3,161
140-250-375 B 375 7.3 9.3 3,301
140-250-400 B 400 7.1 9.2 3,496
140-250-450 B 450 7.1 8.5 3,825
140-250-500 B 500 6.9 8.4 4,200
140-250-550 B 550 6.7 8.3 4,565
140-250-600 B 600 6.5 8.7 5,220
140-250-650 B 650 6.1 8.3 5,395


ID 2.5" - BARREL TYPE - 16" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
160-250-100 BP 100 12.3 12.5 1259
160-250-125 BP 125 11.8 12.5 1556
160-250-150 BP 150 11.5 12.2 1827
160-250-175 BP 175 11.4 12.0 2094
160-250-200 B 200 9.6 11.5 2,308
160-250-225 B 225 9.4 11.1 2,498
160-250-250 B 250 9.2 10.8 2,700
160-250-300 B 300 8.9 10.3 3,081
160-250-350 B 350 8.6 9.8 3,438
160-250-400 B 400 8.3 9.5 3,802
160-250-450 B 450 7.7 9.8 4,405
160-250-500 B 500 7.8 9.1 4,546


ID 2.5" - BARREL TYPE - 16" & 18" LENGTH (5.0 OD on one end)

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
180-2550-080 BP 80 13.0 14.1 1,133
180-2550-100 BP 100 12.8 13.7 1,369
160-2550-125 BP 125 11.4 12.3 1,537
160-2550-150 BP 150 11.2 11.9 1,786


ID 3.0" - 8" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
080-300-200 200 5.0 5.9 1,181
080-300-300 300 4.5 5.6 1,689
080-300-400 400 4.3 5.4 2,142
080-300-500 500 4.1 5.2 2,579
080-300-600 600 3.9 5.0 3,000


ID 3.0" - 10" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
100-300-200 200 6.0 7.3 1,457
100-300-300 300 5.5 6.9 2,067
100-300-400 400 5.1 6.6 2,646
100-300-500 500 4.9 6.3 3,169
100-300-600 600 4.8 6.1 3,638


ID 3.0" - 12" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
120-300-100 100 8.3 9.2 917
120-300-150 150 8.1 8.8 1,323
120-300-175 175 7.8 8.7 1,530
120-300-200 200 7.5 8.6 1,724
120-300-225 225 7.3 8.5 1,905
120-300-250 250 7.2 8.3 2,077
120-300-275 275 7.2 8.1 2,230
120-300-300 300 7.2 7.9 2,362
120-300-325 325 6.9 7.9 2,572
120-300-350 350 6.8 7.8 2,728
120-300-375 375 6.9 7.5 2,820
120-300-400 400 6.7 7.5 3,008
120-300-425 425 6.7 7.4 3,129
120-300-450 450 6.7 7.2 3,224
120-300-475 475 6.7 7.0 3,329
120-300-500 500 6.5 7.0 3,484
120-300-550 550 6.1 6.9 3,811
120-300-600 600 5.9 6.9 4,134
120-300-650 650 5.8 6.9 4,453
120-300-700 700 5.6 6.9 4,850
120-300-750 750 5.6 6.6 4,961


ID 3.0" - 14" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
140-300-150 150 9.1 10.3 1,541
140-300-175 175 9.0 9.9 1,736
140-300-200 200 8.7 9.8 1,961
140-300-225 225 8.4 9.6 2,170
140-300-250 250 8.3 9.5 2,372
140-300-275 275 8.1 9.3 2,544
140-300-300 300 8.0 9.2 2,752
140-300-350 350 7.8 8.8 3,087
140-300-400 400 7.5 8.7 3,465
140-300-450 450 7.3 8.5 3,809
140-300-500 500 7.2 8.2 4,114
140-300-550 550 7.1 8.0 4,374
140-300-600 600 7.0 7.7 4,606
140-300-650 650 6.2 7.9 5,144


ID 3.0" - 16" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
160-300-250 250 9.4 10.5 2,618
160-300-300 300 8.9 10.2 3,047
160-300-350 350 8.6 10.0 3,486
160-300-400 400 8.5 9.5 3,795
160-300-450 450 8.0 9.6 4,341
160-300-500 500 7.8 9.4 4,705
160-300-550 550 7.7 9.1 5,024
160-300-600 600 7.3 8.9 5,315
160-300-650 650 6.7 9.1 5,911


ID 3.0" - 18" LENGTH

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
kgf/mm inch inch lbs
180-300-250 250 10.4 11.5 2,884
180-300-300 300 10.0 11.1 3,319
180-300-350 350 9.7 10.6 3,720
180-300-400 400 9.4 10.4 4,142
180-300-450 450 8.7 10.7 4,837
180-300-500 500 8.5 10.5 5,256