Torsion Bar - Sprint Car - 30" Long - Tubular - .975 Rate - Not Prestressed
Category: Sprint Car Torsion Bars (Tubular)
Achieve maximum chassis support and platform stability with this ultra-stiff 0.975” rate tubular torsion bar. At 30” in length, this hollow-core bar is designed for modern Sprint Car chassis that require a longer bar for more linear spring rates and increased suspension travel. The non-prestressed design offers a neutral spring rate favored by tuners who prefer a natural break-in and the versatility to use the bar on any corner of the car.
Performance & Fitment
Application: Sprint Car (Winged or Non-Wing)
Length: 30”
Diameter: 0.975”
Type: Tubular (Hollow). This design provides the massive stiffness of a large-diameter bar while significantly reducing unsprung mass, allowing the suspension to cycle faster and maintain better tire-to-track contact than a solid bar.
Rate: 0.975
Non-Prestressed: This bar is omni-directional. Because it has not been pre-twisted during manufacturing, it can be installed on either the Left or Right side of the car. This provides a more natural break-in period and a predictable handling profile for custom tuning.
Tuning Profile: The 0.975" tubular bar is an aggressive tuning tool. It is typically utilized on the Right Rear for high-bite tracks to prevent bottoming out, or as a firm Left Rear option to keep the car "up on the bars" in heavy, high-traction conditions.
Premium Construction
Material: Manufactured from high-strength alloy steel, through-hardened for maximum torsional resilience and a long fatigue life.
Precision Manufacturing: Centerless ground to ensure a perfectly consistent outside diameter and wall thickness. This precision is vital for a tubular bar to maintain a linear and repeatable spring rate.
Heat Treatment: Advanced processing maximizes the steel’s "memory," helping the bar maintain its index and resist sagging during long features.
Finish: Durable coating provides a barrier against the abrasive and corrosive nature of dirt racing environments.
Spline Quality: Precision-machined splines ensure a tight, no-slop interface with your torsion arms and stops for immediate chassis feedback.
⚠️ Critical Fitment Exceptions
Operating at a 0.975" rate requires precise maintenance and chassis prep:
❌ Settling & Ride Height: Because this bar is non-prestressed, it is more likely to "take a set" (settle) during its first few heat cycles compared to a pre-stressed bar. Monitor your ride heights and torsion stop angles closely during the initial night of racing.
❌ Internal Bore Care: Hollow bars are susceptible to internal rust from trapped moisture, which can lead to sudden stress fractures. Keep the internal bore clean and lightly oiled, or ensure it is properly capped.
❌ Critical Tube Clearance: At 0.975", this bar occupies a large volume inside the torsion tube. Your chassis tubes must be perfectly straight and surgically clean. Any internal binding will "lock" the suspension, resulting in a dangerously erratic handling car that skips or "skates" across the track.
❌ Rebound Control: The 0.975" rate generates significant "snap" on rebound. Ensure your shock valving (specifically rebound) is heavy enough to control this rate; otherwise, the car will "pogo" and lose traction on corner exit.
❌ Length Verification: This is a 30" tip-to-tip bar. Ensure your chassis is designed for 30" bars; many standard Sprint Cars utilize 29" bars, while others use 31".
❌ Hardware Stress: The torque generated by a 0.975" bar is immense. Inspect your torsion arms and stops for any "egging" or spline wear, as the loads can shear or strip standard aluminum hardware.
What’s Included
(1) Sprint Car Torsion Bar – 30" Long, 0.975" Diameter, Tubular, Non-Prestressed
Warranty
Backed by a 1-year warranty for peace of mind.
Stock Information
13 in stock (can be backordered).