Track Theorem Delta

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THE BENCHMARK EVOLVES! The Track Theorem earned its reputation as one of the best rolling balls in Track history by delivering a motion that simply worked across styles, conditions , and skill levels. Now, the Track Theorem Delta builds on that legacy, recreating the trusted Theorem shape with enhanced performance. Designed to stay true to the original’s benchmark performance, the Theorem Delta offers a powerful blend of strong midlane and a sharper response to friction, giving bowlers the best of both worlds. Compared to the original, it delivers added responsiveness downlane while preserving that sweeping ball motion that made the Theorem so reliable. The result is a versatile, go-to option that captures the essence of the original, now with more continuation and backend that Track fans love. SPECIFICATIONS Performance Upper Mid Part Number 60-108645-93X Color Black / Indigo / Blue Core MC2 Asym Coverstock Super Response Hybrid (HK22) Cover Type Hybrid Reactive Finish 500, 1000, 1500 Siaair / Factory Compound Weights 16-12 Pounds Lane Condition Medium to oily Reaction Skid / Flip Warranty Two years from purchase date Release Date August 13, 2026 CORE NUMBERS Weight RG DIFF ASY 16 lb 2.485 0.044 0.017 15 lb 2.473 0.046 0.017 14 lb 2.487 0.046 0.017 13 lb 2.597 0.041 0.014 12 lb 2.593 0.041 0.014 Show more