One of the best-rolling balls in Track history, reborn. The original Theorem earned its reputation by delivering a motion that simply worked across styles, conditions, and skill levels. The Theorem Delta builds on that legacy, recreating the trusted Theorem shape with enhanced performance.

Designed to stay true to the original's benchmark performance, it offers a powerful blend of strong midlane and a sharper response to friction. Compared to the original, it adds responsiveness downlane while preserving that sweeping motion that made the Theorem so reliable — a versatile go-to with more continuation and backend that Track fans love.

Who It's For

• Benchmark players — the trusted Theorem shape that works across conditions.
• Theorem owners — the original's roll with more downlane responsiveness.
• All skill levels — a versatile, sweeping motion that simply works.

Ball Specifications

• Color: Black/Indigo/Blue
• Coverstock: Super Response Hybrid (HK22)
• Weight Block: MC2 Asym
• Factory Finish: 500, 1000, 1500 Siaair / Factory Compound
• Flare Potential: N/A
• Radius of Gyration (RG): 16lbs - 2.485; 15lbs - 2.473; 14lbs - 2.487
• Differential (Diff): 16lbs - 0.044; 15lbs - 0.046; 14lbs - 0.046
• Intermediate Differential (Diff): N/A
• Fragrance: N/A

Backed by expert drilling, fast shipping, and the best prices on performance gear.