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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

DRAG RACE SPECIFIC - STRAIGHT TYPE - 14" LENGTH

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
140-250-095 95 1.7 8.5 217 10.8 274 1,024 466
140-250-110 110 2 8.3 212 10.6 269 1,165 530
140-250-125 125 2.2 8.3 210 10.4 263 1,294 588

ID 2.5" - STRAIGHT TYPE - 4" LENGTH

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
040-250-300 300 5.4 2.6 66 2.8 71 843 383
040-250-350 350 6.3 2.5 64 2.7 70 960 436
040-250-400 400 7.2 2.5 63 2.7 68 1,066 483
040-250-450 450 8.1 2.4 61 2.6 67 1,182 536
040-250-500 500 9 2.4 60 2.6 66 1,289 585
040-250-550 550 9.8 2.3 59 2.5 64 1,388 629
040-250-600 600 10.7 2.3 58 2.5 63 1,476 669

ID 2.5" - STRAIGHT TYPE - 8" LENGTH

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
080-250-200 200 3.6 5.1 129 5.8 146 1,151 522
080-250-225 225 4 4.9 125 5.7 145 1,280 581
080-250-250 250 4.5 4.8 122 5.6 142 1,402 635
080-250-275 275 4.9 4.7 120 5.5 140 1,516 687
080-250-300 300 5.4 4.7 119 5.4 137 1,620 735
080-250-325 325 5.8 4.6 116 5.4 137 1,748 792
080-250-350 350 6.3 4.6 116 5.2 133 1,837 833
080-250-375 375 6.7 4.5 113 5.2 132 1,953 886
080-250-400 400 7.2 4.4 112 5.2 131 2,066 937
080-250-425 425 7.6 4.3 110 5.1 130 2,172 985
080-250-450 450 8.1 4.3 109 5.1 128 2,273 1,032
080-250-475 475 8.5 4.3 108 5 127 2,371 1,075
080-250-500 500 9 4.2 107 4.9 125 2,461 1,116
080-250-525 525 9.4 4.2 106 4.8 123 2,544 1,155
080-250-550 550 9.8 4.1 104 4.9 124 2,679 1,215
080-250-600 600 10.7 4 101 4.8 122 2,884 1,308
080-250-650 650 11.6 4 101 4.6 118 3,009 1,365
080-250-700 700 12.5 3.9 100 4.5 115 3,180 1,443
080-250-750 750 13.4 3.8 97 4.5 115 3,405 1,544
080-250-800 800 14.3 3.8 96 4.4 113 3,550 1,610
080-250-850 850 15.2 3.7 94 4.4 112 3,758 1,705
080-250-900 900 16.1 3.7 94 4.3 109 3,869 1,755
080-250-950 950 17 3.7 94 4.2 106 3,957 1,795
080-250-1000 1000 17.9 3.6 92 4.1 105 4,130 1,874

ID 2.5" - BARREL TYPE - 10" LENGTH

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
100-250-100 B 100 1.8 7.2 184 8.6 218 817 370
100-250-125 B 125 2.2 6.8 173 8.4 213 995 451
100-250-150 B 150 2.7 6.8 172 8.2 207 1,152 523
100-250-175 B 175 3.1 6.5 166 8.1 204 1,323 600
100-250-185 B 185 3.3 6.4 162 8.1 205 1,399 635
100-250-200 B 200 3.6 6.4 162 7.9 201 1,481 672
100-250-225 B 225 4 6.3 160 7.8 197 1,625 737
100-250-250 B 250 4.5 6.1 156 7.7 195 1,783 809
100-250-275 B 275 4.9 5.9 149 7.7 195 1,961 889
100-250-300 B 300 5.4 5.8 147 7.6 192 2,101 953
100-250-325 B 325 5.8 5.6 143 7.5 192 2,266 1,028
100-250-350 B 350 6.3 5.6 142 7.4 188 2,387 1,083
100-250-375 B 375 6.7 5.6 142 7.2 182 2,494 1,131
100-250-400 B 400 7.2 5.5 140 7.1 180 2,633 1,194
100-250-425 B 425 7.6 5.4 137 7 179 2,768 1,255
100-250-450 B 450 8.1 5.3 135 7 177 2,895 1,313
100-250-475 B 475 8.5 5.4 136 6.8 172 2,955 1,340
100-250-500 B 500 9 5.3 135 6.7 169 3,061 1,388
100-250-525 B 525 9.4 5.2 132 6.7 170 3,231 1,465
100-250-550 B 550 9.8 5.2 131 6.6 168 3,324 1,508
100-250-575 B 575 10.3 4.9 125 6.8 172 3,563 1,616
100-250-600 B 600 10.7 5 128 6.5 165 3,565 1,617
100-250-650 B 650 11.6 4.9 125 6.2 158 3,785 1,717
100-250-700 B 700 12.5 4.8 121 6.2 159 4,079 1,850
100-250-750 B 750 13.4 4.6 117 6.2 158 4,355 1,976

ID 2.5" - BARREL TYPE - 12" LENGTH

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
120-250-100 B 100 1.8 8.5 216 9.9 252 954 433
120-250-125 B 125 2.2 8.2 207 9.8 248 1,161 527
120-250-150 B 150 2.7 7.8 199 9.6 244 1,364 619
120-250-175 B 175 3.1 7.7 196 9.4 238 1,547 702
120-250-185 B 185 3.3 7.7 196 9.2 235 1,612 732
120-250-200 B 200 3.6 7.5 190 9.2 234 1,731 786
120-250-225 B 225 4 7.4 187 9 229 1,902 863
120-250-250 B 250 4.5 7.3 185 8.8 223 2,051 931
120-250-275 B 275 4.9 7.1 181 8.7 220 2,219 1,008
120-250-300 B 300 5.4 6.9 174 8.6 218 2,420 1,099
120-250-325 B 325 5.8 6.8 172 8.4 214 2,567 1,165
120-250-350 B 350 6.3 6.6 167 8.4 213 2,753 1,250
120-250-375 B 375 6.7 6.5 166 8.2 208 2,873 1,305
120-250-400 B 400 7.2 6.4 162 8.1 207 3,039 1,380
120-250-425 B 425 7.6 6.3 160 8.1 205 3,194 1,450
120-250-450 B 450 8.1 6.1 154 8.1 207 3,414 1,550
120-250-475 B 475 8.5 6 152 8.1 205 3,561 1,617
120-250-500 B 500 9 6 153 7.8 198 3,612 1,640
120-250-525 B 525 9.4 6.1 155 7.4 187 3,644 1,655
120-250-550 B 550 9.8 5.8 148 7.6 192 3,932 1,786
120-250-575 B 575 10.3 5.8 147 7.4 189 4,036 1,833
120-250-600 B 600 10.7 5.8 147 7.3 185 4,124 1,873
120-250-650 B 650 11.6 5.6 143 7.2 182 4,381 1,990
120-250-700 B 700 12.5 5.6 141 7 179 4,611 2,094
120-250-750 B 750 13.4 5.4 136 7 179 4,937 2,242

ID 2.5" - BARREL TYPE - 12" LENGTH PROGRESSIVE

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
120-250-300V 100/300 1.8/5.5 5.9 150 6.7 170 1,448 657
120-250-500V2 200/500 3.5/8.9 5.5 140 5.8 147 2,070 939
120-250-500V3 300/500 5.4/8.9 5.5 140 6.5 164 2,682 1,216

ID 2.5" - BARREL TYPE - 14" LENGTH

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
140-250-100 BP 100 1.8 10.6 270 10.8 275 1,082 491
140-250-125 BP 125 2.2 10.3 261 10.7 272 1,338 607
140-250-140 BP 140 2.5 10.2 260 10.6 268 1,477 670
140-250-150 BP 150 2.7 10 255 10.5 266 1,570 712
140-250-165 BP 165 3 9.8 249 10.4 264 1,715 778
140-250-175 BP 175 3.1 9.8 249 10.3 262 1,808 820
140-250-185 BP 185 3.3 9.7 247 10.2 259 1,889 857
140-250-200 BP 200 3.6 9.7 246 10.1 258 2,030 921
140-250-225 B 225 4 8.1 206 10.4 264 2,209 1,004
140-250-250 B 250 4.5 7.8 199 10.3 263 2,432 1,105
140-250-275 B 275 4.9 8 203 9.8 248 2,541 1,155
140-250-300 B 300 5.4 7.7 195 9.8 249 2,777 1,262
140-250-325 B 325 5.8 7.6 192 9.6 244 2,944 1,338
140-250-350 B 350 6.3 7.3 186 9.5 241 3,161 1,436
140-250-375 B 375 6.7 7.3 185 9.3 235 3,301 1,500
140-250-400 B 400 7.2 7.1 180 9.2 234 3,496 1,589
140-250-450 B 450 8 7.1 180 8.5 216 3,825 1,736
140-250-500 B 500 8.9 6.9 175 8.4 213 4,200 1,902
140-250-550 B 550 9.8 6.7 169 8.3 211 4,565 2,072
140-250-600 B 600 10.7 6.5 164 8.7 221 5,220 2,368
140-250-650 B 650 11.6 6.1 156 8.3 211 5,395 2,449

ID 2.5" - BARREL TYPE - 16" LENGTH

Part # Spring Rate Usable Stroke Max Stroke Max. Load
lbs/inch kgf/mm inch mm inch mm lbs kg
160-250-100 BP 100 1.8 12.3 312 12.5 319 1259 571
160-250-125 BP 125 2.2 11.8 299 12.5 317 1556 706
160-250-150 BP 150 2.7 11.5 292 12.2 310 1827 829
160-250-165 B 165 3 10.1 256 11.8 299 1,943 884
160-250-175 BP 175 3.1 11.4 290 12 304 2094 950
160-250-200 B 200 3.6 9.6 243 11.5 293 2,308 1,049
160-250-225 B 225 4 9.4 238 11.1 282 2,498 1,128
160-250-250 B 250 4.5 9.2 234 10.8 274 2,700 1,228
160-250-300 B 300 5.4 8.9 226 10.3 261 3,081 1,401
160-250-350 B 350 6.3 8.6 219 9.8 250 3,438 1,563
160-250-400 B 400 7.2 8.3 212 9.5 241 3,802 1,728
160-250-450 B 450 8.1 7.7 196 9.8 249 4,405 2,003
160-250-500 B 500 9 7.8 197 9.1 231 4,546 2,067

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