Suspension and Components
Circle Track Suspension Parts: Control Arms, Shocks & Springs for IMCA & Late Models at JJ Motorsports
Optimize handling and stability on the track with premium circle track suspension components from JJ Motorsports. Our selection includes control arms, shocks, springs, weight jacks, and more, designed for superior cornering, durability, and performance in late models, modifieds, street stocks, and IMCA dirt racing. Compatible with GM Metric frames and other setups, these high-quality parts ensure reliable operation and enhanced traction under intense racing conditions.
Shop trusted brands like Allstar Performance. Explore related categories such as circle track steering and components for precision control or circle track brakes for stopping power.
Top Circle Track Suspension Products
- Lower Control Arm Kit for 1978-88 GM Metric Street Stock & Hobby Stock, Includes Ball Joints & Greasable Bushings – This kit includes stamped steel lower control arms with black powdercoat finish, greasable bushings, and weld-in greasable ball joints for enhanced suspension performance. It is compatible with 1978-88 GM Metric G-Body vehicles and designed for street stock and hobby stock racing applications.
- Allstar Performance Metric Upper Control Arm Left 9in ALL57984 – This tubular upper control arm is designed for the driver side on GM Metric Frames, measuring 9.00 inches long with a bolt-in ball joint and steel construction finished in black powder coat. It features greasable pivot points and is ideal for hobby stock race cars, providing a perfect fit and function.
- Spring Cup Weight Jack Bolt Combo ONE PAIR IMCA Modified Dirt USRA B-Mod Cups – This kit includes two 8" long steel jack bolts with 1-8 course threads and two steel spring cups with a 5-inch outer diameter. It is designed for IMCA Modified, Dirt, and USRA B-Mod cups.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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Conventional Spring 9.5in x 5in x 500# 950-500-500
SWIFT SPRINGS
$128.35Front suspension geometry demands a spring that can handle consistent load cycles without degradation—this conventional coil spring delivers predictable, linear rate characteristics essential for tuning your suspension's ride frequency and handling...SWI950-500-500- SKU:
- SWI950-500-500
- Availability:
- Ships Same Business Day
- Weight:
- 6.35 LBS
- MFG Part #:
- 950-500-500
- Spring Rate:
- 500 lb.
- Spring Height:
- 9.5"
- Spring ID:
- 5"
$128.35 -
Conventional Spring 9.5in x 5in x 450# 950-500-450
SWIFT SPRINGS
$128.35A properly matched rear spring is critical for maintaining chassis balance and predictable handling characteristics during acceleration, braking, and cornering. The 450 lb/in rate in this conventional spring delivers the stiffness needed for performance...SWI950-500-450- SKU:
- SWI950-500-450
- Availability:
- Ships Same Business Day
- Weight:
- 5.88 LBS
- MFG Part #:
- 950-500-450
- Spring Rate:
- 450 lb.
- Spring Height:
- 9.5"
- Spring ID:
- 5"
$128.35 -
Conventional Spring 20in x 5in x 125lb 200-500-125
SWIFT SPRINGS
$153.85A properly matched rear spring is fundamental to suspension geometry and handling balance—this conventional coil spring delivers a measured 125 lb/in rate for applications demanding consistent, predictable load support without excessive stiffness...SWI200-500-125- SKU:
- SWI200-500-125
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- MFG Part #:
- 200-500-125
- Spring Rate:
- 125 lb.
- Spring Height:
- 20"
- Spring ID:
- 5"
$153.85 -
Conventional Spring 20in x 5in x 100lb 200-500-100
SWIFT SPRINGS
$145.35A properly engineered rear spring is fundamental to consistent handling and load support in any performance application. This 100 lb/in conventional spring delivers predictable compliance for vehicles requiring moderate spring rates, maintaining...SWI200-500-100- SKU:
- SWI200-500-100
- Availability:
- Ships Same Business Day
- Weight:
- 7.45 LBS
- MFG Part #:
- 200-500-100
- Spring Rate:
- 100 lb.
- Spring Height:
- 20"
- Spring ID:
- 5"
$145.35 -
Conventional Spring 20in x 5in x 80lb 200-500-080
SWIFT SPRINGS
$145.35Proper suspension geometry demands a spring that delivers consistent, predictable support without compromise. This conventional coil spring provides the foundation for controlled weight transfer and chassis balance, making it essential for racers and...SWI200-500-080- SKU:
- SWI200-500-080
- Availability:
- Ships Same Business Day
- Weight:
- 6.40 LBS
- MFG Part #:
- 200-500-080
- Spring Rate:
- 80 lb.
- Spring Height:
- 20"
- Spring ID:
- 5"
$145.35 -
Conventional Spring 20in x 5in x 50lb 200-500-050
SWIFT SPRINGS
$145.35A properly functioning suspension requires springs that deliver consistent performance lap after lap. This conventional coil spring provides reliable load support and predictable handling characteristics for rear-end applications where durability matters...SWI200-500-050- SKU:
- SWI200-500-050
- Availability:
- Ships Same Business Day
- Weight:
- 5.10 LBS
- MFG Part #:
- 200-500-050
- Spring Rate:
- 50 lb.
- Spring Height:
- 20"
- Spring ID:
- 5"
$145.35 -
Coil-Over Spring 20in x 2.50in Progressive 200-250-150 V
SWIFT SPRINGS
$170.85Progressive spring rates deliver the compliance you need for everyday driving comfort while maintaining the responsiveness required when you push hard through corners. This 20-inch coil-over spring integrates seamlessly into custom suspension builds,...SWI200-250-150V- SKU:
- SWI200-250-150V
- Availability:
- Ships Same Business Day
- Weight:
- 9.30 LBS
- MFG Part #:
- 200-250-150 V
- Spring Height:
- 20"
- Spring ID:
- 2.5"
$170.85 -
Coil-Over Spring 18in x 5in x 100lb 2.5in ID 180-2550-100 BP
SWIFT SPRINGS
$136.85A quality coil-over spring is the foundation of responsive suspension tuning, giving you precise control over ride height and spring rates without compromising performance. This 100 lb/in barrel spring delivers the stiffness needed for track applications...SWI180-2550-100BP- SKU:
- SWI180-2550-100BP
- Availability:
- Ships Same Business Day
- Weight:
- 7.00 LBS
- MFG Part #:
- 180-2550-100 BP
- Spring Rate:
- 100 lb.
- Spring Height:
- 18"
- Spring ID:
- 5"
$136.85 -
Coil-Over Spring 18in x 5in x 80lb 2.5in ID 180-2550-080 BP
SWIFT SPRINGS
$136.85Precision suspension geometry demands a coil-over spring engineered to your exact specifications—and this 80lb/in unit delivers the consistency and durability that separates competitive setups from guesswork. Whether you're fine-tuning bump stiffness for...SWI180-2550-080BP- SKU:
- SWI180-2550-080BP
- Availability:
- Ships Same Business Day
- Weight:
- 5.00 LBS
- MFG Part #:
- 180-2550-080 BP
- Spring Rate:
- 80 lb.
- Spring Height:
- 18"
- Spring ID:
- 5"
$136.85 -
Conventional Spring 16in x 5in x 225lb 160-500-225
SWIFT SPRINGS
$136.85A properly tuned suspension starts with the right spring rate. This conventional coil spring delivers the 225 lb/in rate needed for precise rear-end geometry and consistent handling characteristics across a wide range of driving conditions. Whether...SWI160-500-225- SKU:
- SWI160-500-225
- Availability:
- Ships Same Business Day
- Weight:
- 8.60 LBS
- MFG Part #:
- 160-500-225
- Spring Rate:
- 225 lb.
- Spring Height:
- 16"
- Spring ID:
- 5"
$136.85 -
Conventional Spring 16in x 5in x 200# 160-500-200
SWIFT SPRINGS
$136.85A properly matched rear spring is essential for maintaining suspension geometry and load capacity under acceleration, braking, and cornering. This 200 lb/in conventional coil spring delivers predictable, linear rates ideal for street applications and...SWI160-500-200- SKU:
- SWI160-500-200
- Availability:
- Ships Same Business Day
- Weight:
- 7.79 LBS
- MFG Part #:
- 160-500-200
- Spring Rate:
- 200 lb.
- Spring Height:
- 16"
- Spring ID:
- 5"
$136.85 -
Conventional Spring 16in x 5in x 175# 160-500-175 BP
SWIFT SPRINGS
$136.85A quality rear suspension spring is fundamental to your vehicle's handling dynamics, load capacity, and ride consistency. This conventional coil spring delivers a moderate 175 lb/in rate—ideal for street-performance applications and light-duty racing...SWI160-500-175BP- SKU:
- SWI160-500-175BP
- Availability:
- Ships Same Business Day
- Weight:
- 6.60 LBS
- MFG Part #:
- 160-500-175 BP
- Spring Rate:
- 175 lb.
- Spring Height:
- 16"
- Spring ID:
- 5"
$136.85 -
Coil-Over Spring 16in x 5in x 150lb 2.5in ID 160-2550-150 BP
SWIFT SPRINGS
$136.85A quality coil-over spring is the foundation of responsive suspension tuning—this 150 lb/in rate delivers predictable load support without sacrificing ride compliance on street or track applications. The super barrel design minimizes coil bind and...SWI160-2550-150BP- SKU:
- SWI160-2550-150BP
- Availability:
- Ships Same Business Day
- Weight:
- 13.00 LBS
- MFG Part #:
- 160-2550-150 BP
- Spring Rate:
- 150 lb.
- Spring Height:
- 16"
- Spring ID:
- 2.5"
$136.85 -
Coil-Over Spring 16in x 5in x 125lb 2.5in ID 160-2550-125 BP
SWIFT SPRINGS
$136.85If you're building a performance suspension setup that demands precise ride height adjustment and consistent spring rates, this 125 lb/in coil-over spring delivers the tuning capability you need. The super barrel design minimizes bind and lateral...SWI160-2550-125BP- SKU:
- SWI160-2550-125BP
- Availability:
- Ships Same Business Day
- Weight:
- 6.00 LBS
- MFG Part #:
- 160-2550-125 BP
- Spring Rate:
- 125 lb.
- Spring Height:
- 16"
- Spring ID:
- 2.5"
$136.85 -
Barrel Spring 16in x 2.5in 150# 160-250-150 BP
SWIFT SPRINGS
$128.35A precision-engineered coil spring built for serious racers and performance enthusiasts who demand consistent, predictable suspension geometry lap after lap. The 150 lb/in spring rate delivers the compliance needed for road course setups while...SWI160-250-150BP- SKU:
- SWI160-250-150BP
- Availability:
- Ships Same Business Day
- Weight:
- 6.40 LBS
- MFG Part #:
- 160-250-150 BP
- Spring Rate:
- 150 lb.
- Spring Height:
- 16"
- Spring ID:
- 2.5"
$128.35 -
Barrel Spring 16in x 2.5in 125# 160-250-125 BP
SWIFT SPRINGS
$128.35The Barrel Spring 16in x 2.5in 125# delivers consistent, predictable suspension geometry when you need it most—whether you're tuning a street-strip coil-over setup or dialing in a dedicated track car. The 125 lb/in spring rate offers a sweet spot between...SWI160-250-125BP- SKU:
- SWI160-250-125BP
- Availability:
- Ships Same Business Day
- Weight:
- 6.00 LBS
- MFG Part #:
- 160-250-125 BP
- Spring Rate:
- 125 lb.
- Spring Height:
- 16"
- Spring ID:
- 2.5"
$128.35 -
Barrel Spring 16in x 2.5in 100# 160-250-100BP
SWIFT SPRINGS
$128.35If you're tuning a coil-over suspension system, spring rate is everything—and this 100 lb/in barrel spring delivers the linear support you need for consistent handling across a wide range of track conditions. The 16-inch length and 2.5-inch inner...SWI160-250-100BP- SKU:
- SWI160-250-100BP
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- MFG Part #:
- 160-250-100BP
- Spring Rate:
- 100 lb.
- Spring Height:
- 16"
- Spring ID:
- 2.5"
$128.35 -
Barrel Spring 14in x 2.5in x 325# 140-250-325 B
SWIFT SPRINGS
$119.85A properly tuned suspension requires the right spring rate for your specific application—this 325 lb/in coil-over spring delivers the stiffness needed for precision handling without sacrificing ride quality. Whether you're fine-tuning a track car or...SWI140-250-325B- SKU:
- SWI140-250-325B
- Availability:
- Ships Same Business Day
- Weight:
- 6.56 LBS
- MFG Part #:
- 140-250-325 B
- Spring Rate:
- 325 lb.
- Spring Height:
- 14"
- Spring ID:
- 2.5"
$119.85 -
Barrel Spring 14in x 2.5in x 300# 140-250-300 B
SWIFT SPRINGS
$119.85If you're building a coil-over suspension system, spring rate consistency directly impacts your car's handling balance and predictability on track. This barrel spring delivers a stiff 300 lb/in rate in a compact 14-inch package, making it ideal for...SWI140-250-300B- SKU:
- SWI140-250-300B
- Availability:
- Ships Same Business Day
- Weight:
- 5.16 LBS
- MFG Part #:
- 140-250-300 B
- Spring Rate:
- 300 lb.
- Spring Height:
- 14"
- Spring ID:
- 2.5"
$119.85 -
Barrel Spring 14in x 2.5in x 275# 140-250-275 B
SWIFT SPRINGS
$119.85A properly matched coil spring is fundamental to suspension performance—too soft and you'll experience excessive body roll and inconsistent handling; too stiff and you sacrifice ride quality and tire contact. This 275 lb/in barrel spring delivers the...SWI140-250-275B- SKU:
- SWI140-250-275B
- Availability:
- Ships Same Business Day
- Weight:
- 6.32 LBS
- MFG Part #:
- 140-250-275 B
- Spring Rate:
- 275 lb.
- Spring Height:
- 14"
- Spring ID:
- 2.5"
$119.85
