{"merchant":{"slug":"bowlersmart","name":"BowlersMart","domain":"www.bowlersmart.com"},"id":"1470567","sku":"60-108645","gtin":null,"name":"Track Theorem Delta Bowling Ball","brand":"Track","categories":[{"name":"Asymmetrical Core Bowling Balls","slug":"asymmetrical-core-bowling-balls"},{"name":"Ball Add-Ons","slug":"ball-add-ons"},{"name":"Bowling Balls","slug":"bowling-balls"},{"name":"Bowling Brand","slug":"brands"},{"name":"Heavy Oil Bowling Balls","slug":"heavy-oil-bowling-balls"},{"name":"High Performance Bowling Balls","slug":"high-performance-bowling-balls"},{"name":"Hybrid Reactive Bowling Balls","slug":"hybrid-reactive-bowling-balls"},{"name":"MRP/MAP","slug":"mrp-map"},{"name":"Pre-Orders / New Releases","slug":"new-bowling-balls"},{"name":"Track","slug":"track"},{"name":"Track Bowling Balls","slug":"track-bowling-balls"}],"buy_url":"https://www.bowlersmart.com/product/track-theorem-delta-bowling-ball/","pages":{"html":"https://ittems.com/bowlersmart/p/track-theorem-delta-bowling-ball","md":"https://ittems.com/bowlersmart/p/track-theorem-delta-bowling-ball.md","json":"https://ittems.com/bowlersmart/p/track-theorem-delta-bowling-ball.json"},"price":{"min":174.95,"max":174.95,"currency":"USD"},"availability":"instock","checked_at":"2026-10-18T09:53:03.004406+00:00","source_updated_at":"2026-10-18T09:07:33+00:00","summary":"What should I know about the Theorem Delta? •Asymmetric MC2 Asym core for strong flare and an early, continuous midlane read •Super Response Hybrid (HK22) cover at a 500, 1000, 1500 Siaair with Factory Compound finish •Recreates the trusted Theorem shape with a sharper skid/flip backend for medium…","specs":[{"key":"Brand","value":"Track"},{"key":"Bowling Ball Coverstock Type","value":"Hybrid Reactive"},{"key":"Bowling Ball Cover Name","value":"Track Super Response Hybrid HK22 Reactive"},{"key":"Bowling Ball Core Shape","value":"Asymmetrical Core"},{"key":"Bowling Ball Core Name","value":"Track MC2 Asym Core"},{"key":"Radius of Gyration: RG (15LB)","value":"2.473"},{"key":"Differential: Diff (15LB)","value":".046"},{"key":"Mass Bias Strength","value":".017"},{"key":"Flare Potential","value":"4 - 5 Inches"},{"key":"Surface Finish","value":"500, 1000, 1500 Siaair / Factory Compound"},{"key":"Preferred Lane Conditions","value":"Medium - Heavy Oil"},{"key":"Bowling Ball Color","value":"Black, Blue, Indigo"},{"key":"Ball Performance Level","value":"High Performance Bowling Balls"},{"key":"Scent","value":"None"},{"key":"Release Date","value":"August 2026"}],"variants":[{"sku":"60-108645-936","gtin":"840315629165","label":"16LB","price":174.95,"stock":8,"options":{"Ball Weight":"16LB"},"availability":"instock","regular_price":279.95},{"sku":"60-108645-935","gtin":"840315629172","label":"15LB","price":174.95,"stock":147,"options":{"Ball Weight":"15LB"},"availability":"instock","regular_price":279.95},{"sku":"60-108645-934","gtin":"840315629189","label":"14LB","price":174.95,"stock":87,"options":{"Ball Weight":"14LB"},"availability":"instock","regular_price":279.95},{"sku":"60-108645-933","gtin":"840315629196","label":"13LB","price":174.95,"stock":16,"options":{"Ball Weight":"13LB"},"availability":"instock","regular_price":279.95},{"sku":"60-108645-932","gtin":"840315629202","label":"12LB","price":174.95,"stock":12,"options":{"Ball Weight":"12LB"},"availability":"instock","regular_price":279.95}],"options":[{"name":"Drilling Protection","type":"multiple_choice","price":null,"choices":[{"label":"✓ Yes — Protect My Ball","price":4.95,"price_type":"quantity_based"},{"label":"No thanks","price":null,"price_type":"quantity_based"}],"required":false,"price_type":"flat_fee"},{"name":"Extra 365 Protection","type":"multiple_choice","price":null,"choices":[{"label":"✓ Yes — Extend My Coverage","price":5.95,"price_type":"quantity_based"},{"label":"No thanks","price":null,"price_type":"quantity_based"}],"required":false,"price_type":"flat_fee"},{"name":"Specific Requests","type":"custom_text","price":null,"choices":[],"required":false,"price_type":"quantity_based"}],"images":[{"alt":"Track Theorem Delta bowling ball","url":"https://www.bowlersmart.com/wp-content/uploads/2026/06/track-theorem-delta-bowling-ball.webp"},{"alt":"Track Theorem Delta MC2 Asym core","url":"https://www.bowlersmart.com/wp-content/uploads/2026/06/track-theorem-delta-core.webp"}],"release_date":"August 2026","description":"The Trusted Theorem Shape With Sharper Backend\n\nAbout the Theorem Delta\n\nThe Track Theorem Delta rebuilds one of the most trusted shapes in Track history. The original Theorem earned its reputation as one of the best rolling balls Track ever made, delivering a motion that simply worked across styles, conditions, and skill levels. The Theorem Delta stays true to that benchmark while adding enhanced performance, pairing the asymmetric MC2 Asym core with the Super Response Hybrid (HK22) coverstock for a strong midlane read and a sharper response to friction.\n\nWhere the original was prized for its sweeping, dependable shape, the Theorem Delta keeps that sweeping motion and layers in more continuation and backend. It offers a powerful blend of strong midlane and a quicker reaction off the dry, giving you the best of both worlds: an early, controllable read through the heads with added responsiveness down the lane. The result is a versatile, go-to option that captures the essence of the original with the extra punch Track fans look for.\n\nUnderstanding the Track MC2 Asym Core and Track Super Response Hybrid HK22 Reactive\n\nTrack built the Theorem Delta to recreate the trusted Theorem shape with more downlane response. The asymmetric MC2 Asym core reads the midlane strongly and keeps the ball rolling forward, while the Super Response Hybrid (HK22) cover, finished at 500, 1000, 1500 Siaair with Factory Compound, clears the heads cleanly and then snaps to a skid/flip motion off the friction. The reaction is medium to oily friendly: strong through the middle, sharp on the backend. The full per-weight numbers are listed below.\n\nAn Asymmetric Engine for Strong Midlane and Forward Roll\n\nAt the heart of the Theorem Delta is the asymmetric MC2 Asym core. At 16 lb it measures an RG of 2.485, a .044 differential, and a .017 intermediate differential (asymmetry), numbers that produce strong flare and a defined, early midlane read. The asymmetry gives the core a preferred spin axis, so your layout has a real say in how early the ball revs and how hard it transitions off the friction. Track wraps the MC2 Asym core in DynamiCore, the outer-core technology that adds durability and a stronger, more responsive hit through the pins.\n\nThat low RG and healthy differential are what give the Theorem Delta its signature shape: it gets into a roll early, stores energy through the midlane, and keeps driving forward instead of rolling out. Paired with the right layout, the MC2 Asym core delivers the sweeping, continuous motion the Theorem name is built on, now with more backend continuation.\n\nA Hybrid Cover Built to Clear the Heads and Snap on the Backend\n\nWrapping the MC2 Asym core is the Super Response Hybrid (HK22) coverstock. Built on Track's HK22 base chemistry, the hybrid formulation blends solid traction with pearl-like length, so the Theorem Delta reads medium to oily lanes with control and still finds the friction cleanly. Finished at 500, 1000, 1500 Siaair with Factory Compound, the surface clears the front of the lane and then transitions into a sharp skid/flip move off the dry.\n\nTheorem Delta Specs\n\nRG and differential vary by weight. Specifications provided by the manufacturer.\n\nWho This Ball Is Right For\n\n✓All-Around Bowlers: A versatile benchmark shape that works across styles, conditions, and rev rates, just like the original Theorem\n\n✓Tournament Players: A controllable midlane read with a sharper, continuous backend for fresh medium to oily patterns\n\n✓League Bowlers: A dependable first ball out of the bag when the house pattern carries medium to oily volume\n\n✓Theorem Fans: The trusted Theorem motion with added responsiveness downlane and more backend continuation\n\nGood to Know Before You Buy\n\n·Strong, aggressive motion: This is a high-flare piece built for traction. If you want a controlled, lower-hook reaction, a lower-differential ball will suit you better.\n\n·Ships polished: The 500, 1000, 1500 Siaair / Factory Compound finish runs clean and long out of the box. For an earlier read on heavier oil, take the surface down at your pro shop.\n\n·Asymmetric layout sensitivity: Layout choices shift the reaction more than on a symmetric ball. Match the pin and mass bias to your game with your pro shop.\n\n·Colors vary: Actual colors vary somewhat from the photos shown; no two balls come out of the mold exactly alike.\n\n·Tiny pit holes are normal: A few tiny pit holes in the coverstock are a normal part of the manufacturing process.\n\n·Sold undrilled: Ships without finger holes, so it can be fitted to your hand and span.\n\nBowlersMart Tips: Where the Theorem Delta Fits in Your Track Arsenal\n\nWhere It Fits in Your Arsenal\n\nIn the Track lineup, the Theorem Delta is the versatile benchmark you reach for on medium to oily lanes when you want strong midlane control with a sharp backend. When the pattern carries heavier volume and you need earlier traction, step up to a stronger solid in the Track line. When the lanes dry out and you need more length and a cleaner backend, step down to a pearl such as the Spartan Pearl for the later, more angular shape.\n\nSurface Adjustments\n\nThe 500, 1000, 1500 Siaair with Factory Compound finish is the box reaction. Raise the grit for more length when the oil drops, or refresh the box surface to restore the skid/flip move. Have surface changes done at your pro shop for an even, consistent finish.\n\nCoverstock Care\n\nHybrid covers pick up oil over time, which softens the reaction. Wiping the Theorem Delta down after every set and deep cleaning it periodically keeps its clean read and sharp backend consistent over the life of the ball.\n\nEarn points on every Track purchase through the Striking Rewards loyalty program. Every ball you add to your arsenal builds toward your next reward.\n\nShop With Confidence at BowlersMart\n\nThe Track Theorem Delta Bowling Ball ships free with no minimum purchase and is backed by our 60-day return policy. As an authorized Track dealer, every ball is genuine and covered by the full two-year Track warranty. Place your order before 2 PM EST and it ships the same day.\n\nWeight\nRadius of Gyration (RG)\nDifferential\nMass Bias\n\n16 lbs\n2.485\n.044\n.017\n\n15 lbs\n2.473\n.046\n.017\n\n14 lbs\n2.487\n.046\n.017\n\n13 lbs\n2.597\n.041\n.014\n\n12 lbs\n2.593\n.041\n.014","policies":[{"text":"Free ground shipping on US orders, no minimum, 48 contiguous states and military APO/FPO. To Alaska, Hawaii, Puerto Rico and Guam bowling balls ship for $24.95 per ball, most other items free; oversized roller bags cost extra there. International orders pay the rate shown at checkout, duties paid locally.","title":"Shipping","source_url":"https://www.bowlersmart.com/shipping-information/"},{"text":"In-stock items ordered by 2PM EST Monday to Friday ship the same day, later orders the next business day. Carriers USPS, UPS, FedEx. Standard delivery 3 to 7 business days; expedited options at checkout.","title":"Processing and delivery","source_url":"https://www.bowlersmart.com/shipping-information/"},{"text":"60 days from delivery for US customers on new, unused items in original packaging, free prepaid return labels. Drilled bowling balls cannot be returned or exchanged. Shoes must have been tried on a clean, dry surface. Manufacturing defects and shipping damage go through the defect claim process.","title":"Returns","source_url":"https://www.bowlersmart.com/return-exchange-policy/"},{"text":"Credit and debit cards, PayPal, Apple Pay, Google Pay, Venmo, Amazon Pay, and buy now pay later through Affirm, Afterpay and Klarna.","title":"Payment","source_url":"https://www.bowlersmart.com/payment-options/"},{"text":"Pro shops inside bowling centers in 10 US states fit, drill and service equipment; a ball bought online can be drilled there.","title":"Pro shops","source_url":"https://www.bowlersmart.com/locations/"},{"text":"www.bowlersmart.com is the only website of BowlersMart. Lookalike domains are fraudulent.","title":"Identity","source_url":"https://www.bowlersmart.com/resources/scam-awareness/"}]}