Products
Circle Track
Info
OD 5"
Pull Bar Springs
OD 5.5"

Conventional Springs.

Developed specifically for round track racing.
Designed to have the optimal spring rate sweet spot
where the spring is used on actual vehicle.

Info
View Applications

As you might know, the United States is 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, drag racing, and off-road racing.

Quality delivering results.

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.

Superior Material.

All Swift Springs are manufactured using (H5S.TW) which is far superior to silicone chrome steel and allows us to wind our springs with less coils, resulting in reduced un-sprung weight and increased stroke.

Bulletproof series Springs.

[PART NUMBERS 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.

DUE TO CONTINUED ENGINEERING ADVANCES, PRODUCT SPECIFICATION MAY CHANGE WITHOUT NOTICE.

6" Length [OD 5"]

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
060-500-175 175 3.8 4.1 721
060-500-200 200 3.7 4.1 820
060-500-225 225 3.6 4.1 913
060-500-250 250 3.4 4.1 1,021
060-500-700 700 3.0 3.7 2,597
060-500-800 800 2.8 3.6 2,892

6″ Length [OD 5″]
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
060-500-175 175 3.8 4.1 721
060-500-200 200 3.7 4.1 820
060-500-225 225 3.6 4.1 913
060-500-250 250 3.4 4.1 1,021
060-500-700 700 3.0 3.7 2,597
060-500-800 800 2.8 3.6 2,892
8″ Length [OD 5″] – Front Springs
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
080-500-400 F 400 5.1 5.1 2,041
080-500-425 F 425 5.0 5.0 2,149
080-500-450 F 450 4.9 4.9 2,218
080-500-475 F 475 4.8 4.8 2,310
080-500-500 F 500 4.7 4.7 2,361
080-500-525 F 525 4.8 4.8 2,531
080-500-550 F 550 4.6 4.6 2,566
080-500-600 F 600 4.6 4.6 2,806
9.5″ Length [OD 5″] – Hight Travel Front Springs
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
950-500-450F 450 5.8 6.5 2,923
950-500-500F 500 5.6 6.5 3,228
950-500-550F 550 5.5 6.3 3,486
9.5″ Length [OD 5″] – Front Springs
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
950-500-350 350 5.9 6.5 2,258
950-500-375 375 5.8 6.4 2,410
950-500-400 400 5.7 6.5 2,588
950-500-425 425 5.6 6.4 2,731
950-500-450 450 5.7 6.3 2,804
950-500-475 475 5.7 6.3 2,914
950-500-500 500 5.7 6.1 3,051
950-500-525 525 5.6 6.0 3,153
950-500-550 550 5.7 5.8 3,204
950-500-575 575 5.4 5.8 3,417
950-500-600 600 5.5 5.7 3,447
950-500-625 625 5.3 5.9 3,671
950-500-650 650 5.3 5.8 3,763
950-500-700 700 5.3 5.5 3,830
950-500-750 750 5.0 5.7 4,251
950-500-800 800 5.1 5.4 4,285
950-500-850 850 4.8 5.6 4,719
950-500-950 950 4.7 5.3 5,012
11″ Length [OD 5″] – Front Springs
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-500-300F 300 6.8 7.2 2,180
110-500-350F 350 6.7 7.1 2,498
110-500-375 F 375 6.6 7.0 2,623
110-500-400F 400 6.4 7.0 2,784
110-500-425 F 425 6.3 6.9 2,939
110-500-450 F 450 6.3 6.7 3,034
11″ Length [OD 5″] (Part numbers containing BP are Bulletproof Springs)
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-500-080 80 8.7 8.7 694
110-500-100 100 8.6 8.6 858
110-500-125 BP 125 8.5 8.7 1,091
110-500-150 BP 150 8.5 8.6 1,292
110-500-175 BP 175 7.9 8.4 1,479
110-500-200 BP 200 7.6 8.5 1,706
110-500-225 BP 225 7.8 8.2 1,847
110-500-250 250 7.4 8.3 2,066
110-500-275 275 6.9 8.2 2,253
110-500-300 300 6.9 8.0 2,402
110-500-325 325 6.8 7.9 2,568
110-500-350 350 6.6 7.9 2,763
110-500-375 375 6.5 7.8 2,911
110-500-400 400 6.5 7.6 3,052
11″ Length Rear [OD”] Tight Helix Springs(TH)
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-500-225 TH 225 5.0 5.0 1,133
13″ Length [OD 5″] (Part numbers containing BP are Bulletproof Springs)
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
130-500-050 50 10.5 10.5 525
130-500-080 80 10.4 10.4 827
130-500-100 BP 100 10.0 10.2 1,028
130-500-125 BP 125 10.0 10.2 1,279
130-500-150 BP 150 9.7 10.1 1,517
130-500-175 BP 175 9.4 9.9 1,737
130-500-200 BP 200 9.2 9.7 1,940
130-500-225 BP 225 9.2 9.8 2,205
130-500-250 250 8.5 9.5 2,381
130-500-275 275 8.3 9.5 2,600
130-500-300 300 8.4 9.1 2,733
130-500-450 450 7.5 8.6 3,873
130-500-500 500 7.4 8.3 4,173
13″ Length Rear [OD 5″] Tight Helix Springs (TH)
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
130-500-175 TH 175 6.7 6.7 1,164
130-500-200 TH 200 6.3 6.3 1,268
130-500-215 TH 215 6.3 6.3 1,363
130-500-225 TH 225 5.9 5.9 1,338
130-500-235 TH 235 6.2 6.2 1,462
130-500-250 TH 250 5.9 5.9 1,486
14″ Length [OD 5″]
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
140-500-175 175 9.3 10.6 1,852
140-500-200 200 8.9 10.5 2,097
140-500-225 225 8.8 10.4 2,355
140-500-250 250 8.8 10.2 2,540
140-500-275 275 8.5 10.2 2,809
140-500-300 300 8.3 10.1 3,034
140-500-325 325 8.3 9.7 3,164
140-500-350 350 8.1 9.7 3,408
16″ Length [OD 5″] (Part numbers containing BP are Bulletproof Springs)
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
160-500-050 50 12.6 12.6 628
160-500-065 65 12.1 12.1 785
160-500-080 80 12.2 12.2 977
160-500-100 100 12.1 12.1 1,219
160-500-112 112 12.0 12.0 1,349
160-500-125 BP 125 12.0 12.3 1,541
160-500-150 BP 150 11.7 12.0 1,808
160-500-175 BP 175 10.7 12.0 2,100
160-500-200 200 10.5 11.7 2,350
160-500-225 225 10.4 11.4 2,575
18″ Length [OD 5″]
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
180-500-080 80 12.4 13.3 1,069
20″ Length [OD 5″] (Part numbers containing V are Progressive Springs)
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
200-500-050 50 15.0 15.0 747
200-500-065 65 15.5 15.5 1008
200-500-080 80 15.0 15.0 1,197
200-500-100 100 15.0 15.0 1,497
200-500-125 125 14.6 14.6 1,828
200-500-150 150 13.1 14.5 2,179
200-500-175 175 12.5 14.3 2,507
200-500-225V 75/225 12.9 13.3 1,464
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
067-500-600-1200 600-1200 12.9 3.2 3,049
067-500-600-2000 600-2000 12.9 3.0 3,521
 
9.5″ Length [OD 5.5″] – Front Springs
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
950-550-325 325 6.1 6.8 2,201
950-550-400 400 6.0 6.5 2,583
950-550-425 425 5.8 6.5 2,744
950-550-450 450 5.7 6.4 2,870
950-550-500 500 5.5 6.4 3,189
950-550-550 550 5.5 6.2 3,400
950-550-600 600 5.5 5.9 3,567
950-550-650 650 5.1 6.1 3,992
950-550-700 700 5.1 5.9 4,134
950-550-750 750 4.8 6.1 4,558
950-550-800 800 5.0 5.7 4,567
950-550-850 850 4.7 5.9 4,985
950-550-900 900 4.3 4.3 3,843
950-550-950 950 4.5 4.5 4,275
950-550-1000 1000 4.1 4.1 4,100
950-550-1050 1050 4.3 4.3 4,463
950-550-1100 1100 4.3 4.3 4,730
950-550-1150 1150 4.5 4.5 5,175
950-550-1200 1200 3.8 3.8 4,560
11″ Length [OD 5.5″] – Front Springs
PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-550-200 200 8.1 8.1 1,627
110-550-250 250 7.8 7.8 1,947
110-550-275 275 7.7 7.7 2,123
110-550-300 300 7.6 7.6 2,293
110-550-350 350 6.5 7.7 2,701
110-550-375 375 6.3 7.7 2,879
110-550-400 400 6.2 7.7 3,071
110-550-425 425 6.1 7.5 3,196
110-550-900 900 5.0 5.0 4,500
110-550-1000 1000 5.5 5.5 5,500
110-550-1100 1100 4.9 4.9 5,390
110-550-1200 1200 5.3 5.3 6,300
110-550-1300 1300 5.0 5.0 6,500
 

8" Length [OD 5"] - Front Springs

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
080-500-400 F 400 5.1 5.1 2,041
080-500-425 F 425 5.0 5.0 2,149
080-500-450 F 450 4.9 4.9 2,218
080-500-475 F 475 4.8 4.8 2,310
080-500-500 F 500 4.7 4.7 2,361
080-500-525 F 525 4.8 4.8 2,531
080-500-550 F 550 4.6 4.6 2,566
080-500-600 F 600 4.6 4.6 2,806

9.5" Length [OD 5"] - High Travel Front Springs

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
950-500-450F 450 5.8 6.5 2,923
950-500-500F 500 5.6 6.5 3,228
950-500-550F 550 5.5 6.3 3,486

9.5" Length [OD 5"] - Front Springs

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
950-500-350 350 5.9 6.5 2,258
950-500-375 375 5.8 6.4 2,410
950-500-400 400 5.7 6.5 2,588
950-500-425 425 5.6 6.4 2,731
950-500-450 450 5.7 6.3 2,804
950-500-475 475 5.7 6.3 2,914
950-500-500 500 5.7 6.1 3,051
950-500-525 525 5.6 6.0 3,153
950-500-550 550 5.7 5.8 3,204
950-500-575 575 5.4 5.8 3,417
950-500-600 600 5.5 5.7 3,447
950-500-625 625 5.3 5.9 3,671
950-500-650 650 5.3 5.8 3,763
950-500-700 700 5.3 5.5 3,830
950-500-750 750 5.0 5.7 4,251
950-500-800 800 5.1 5.4 4,285
950-500-850 850 4.8 5.6 4,719
950-500-950 950 4.7 5.3 5,012

11" Length [OD 5"] - Front Springs

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-500-300F 300 6.8 7.2 2,180
110-500-350F 350 6.7 7.1 2,498
110-500-375 F 375 6.6 7.0 2,623
110-500-400F 400 6.4 7.0 2,784
110-500-425 F 425 6.3 6.9 2,939
110-500-450 F 450 6.3 6.7 3,034

11" Length [OD 5"]

(Part numbers containing BP are Bulletproof Springs)

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-500-080 80 8.7 8.7 694
110-500-100 100 8.6 8.6 858
110-500-125 BP 125 8.5 8.7 1,091
110-500-150 BP 150 8.5 8.6 1,292
110-500-175 BP 175 7.9 8.4 1,479
110-500-200 BP 200 7.6 8.5 1,706
110-500-225 BP 225 7.8 8.2 1,847
110-500-250 250 7.4 8.3 2,066
110-500-275 275 6.9 8.2 2,253
110-500-300 300 6.9 8.0 2,402
110-500-325 325 6.8 7.9 2,568
110-500-350 350 6.6 7.9 2,763
110-500-375 375 6.5 7.8 2,911
110-500-400 400 6.5 7.6 3,052

11" Length Rear [OD 5"]
Tight Helix Springs (TH)

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-500-225 TH 225 5.0 5.0 1,133

13" Length [OD 5"]

(Part numbers containing BP are Bulletproof Springs)

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
130-500-050 50 10.5 10.5 525
130-500-080 80 10.4 10.4 827
130-500-100 BP 100 10.0 10.2 1,028
130-500-125 BP 125 10.0 10.2 1,279
130-500-150 BP 150 9.7 10.1 1,517
130-500-175 BP 175 9.4 9.9 1,737
130-500-200 BP 200 9.2 9.7 1,940
130-500-225 BP 225 9.2 9.8 2,205
130-500-250 250 8.5 9.5 2,381
130-500-275 275 8.3 9.5 2,600
130-500-300 300 8.4 9.1 2,733
130-500-450 450 7.5 8.6 3,873
130-500-500 500 7.4 8.3 4,173

13" Length Rear [od 5" ]
Tight Helix Springs (TH)

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
130-500-175 TH 175 6.7 6.7 1,164
130-500-200 TH 200 6.3 6.3 1,268
130-500-215 TH 215 6.3 6.3 1,363
130-500-225 TH 225 5.9 5.9 1,338
130-500-235 TH 235 6.2 6.2 1,462
130-500-250 TH 250 5.9 5.9 1,486

14" Length [ OD 5" ]

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
140-500-175 175 9.3 10.6 1,852
140-500-200 200 8.9 10.5 2,097
140-500-225 225 8.8 10.4 2,355
140-500-250 250 8.8 10.2 2,540
140-500-275 275 8.5 10.2 2,809
140-500-300 300 8.3 10.1 3,034
140-500-325 325 8.3 9.7 3,164
140-500-350 350 8.1 9.7 3,408

16" Length [OD 5" ]

(Part numbers containing BP are Bulletproof Springs)

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
160-500-050 50 12.6 12.6 628
160-500-065 65 12.1 12.1 785
160-500-080 80 12.2 12.2 977
160-500-100 100 12.1 12.1 1,219
160-500-112 112 12.0 12.0 1,349
160-500-125 BP 125 12.0 12.3 1,541
160-500-150 BP 150 11.7 12.0 1,808
160-500-175 BP 175 10.7 12.0 2,100
160-500-200 200 10.5 11.7 2,350
160-500-225 225 10.4 11.4 2,575

18" Length [od 5" ]

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
180-500-080 80 12.4 13.3 1,069

20" Length [ od 5" ]

(Part numbers containing V are Progressive Springs)

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
200-500-050 50 15.0 15.0 747
200-500-065 65 15.5 15.5 1008
200-500-080 80 15.0 15.0 1,197
200-500-100 100 15.0 15.0 1,497
200-500-125 125 14.6 14.6 1,828
200-500-150 150 13.1 14.5 2,179
200-500-175 175 12.5 14.3 2,507
200-500-225V 75/225 12.9 13.3 1,464

Pull Bar Springs

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
067-500-600-1200 600-1200 12.9 3.2 3,049
067-500-600-2000 600-2000 12.9 3.0 3,521

9.5" Length [ OD 5.5" ] - Front Springs

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
950-550-325 325 6.1 6.8 2,201
950-550-400 400 6.0 6.5 2,583
950-550-425 425 5.8 6.5 2,744
950-550-450 450 5.7 6.4 2,870
950-550-500 500 5.5 6.4 3,189
950-550-550 550 5.5 6.2 3,400
950-550-600 600 5.5 5.9 3,567
950-550-650 650 5.1 6.1 3,992
950-550-700 700 5.1 5.9 4,134
950-550-750 750 4.8 6.1 4,558
950-550-800 800 5.0 5.7 4,567
950-550-850 850 4.7 5.9 4,985
950-550-900 900 4.3 4.3 3,843
950-550-950 950 4.5 4.5 4,275
950-550-1000 1000 4.1 4.1 4,100
950-550-1050 1050 4.3 4.3 4,463
950-550-1100 1100 4.3 4.3 4,730
950-550-1150 1150 4.5 4.5 5,175
950-550-1200 1200 3.8 3.8 4,560

11" Length [ OD 5.5" ] - Front Springs

PART # SPRING RATE USABLE STROKE MAX STROKE MAX LOAD
lbs/inch inch inch lbs
110-550-200 200 8.1 8.1 1,627
110-550-250 250 7.8 7.8 1,947
110-550-275 275 7.7 7.7 2,123
110-550-300 300 7.6 7.6 2,293
110-550-350 350 6.5 7.7 2,701
110-550-375 375 6.3 7.7 2,879
110-550-400 400 6.2 7.7 3,071
110-550-425 425 6.1 7.5 3,196
110-550-900 900 5.0 5.0 4,500
110-550-1000 1000 5.5 5.5 5,500
110-550-1100 1100 4.9 4.9 5,390
110-550-1200 1200 5.3 5.3 6,300
110-550-1300 1300 5.0 5.0 6,500

Swift Springs - Standard Conventional Springs

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