# Track Theorem Delta Bowling Ball

Sold by BowlersMart (www.bowlersmart.com). $174.95 USD. In stock: 16LB, 15LB, 14LB, 13LB, 12LB. Checked 2026-10-18 09:53 UTC.
Buy: https://www.bowlersmart.com/product/track-theorem-delta-bowling-ball/

## Facts
- Brand: Track
- Category: Asymmetrical Core Bowling Balls > Ball Add-Ons > Bowling Balls > Bowling Brand
- Brand: Track
- Bowling Ball Coverstock Type: Hybrid Reactive
- Bowling Ball Cover Name: Track Super Response Hybrid HK22 Reactive
- Bowling Ball Core Shape: Asymmetrical Core
- Bowling Ball Core Name: Track MC2 Asym Core
- Radius of Gyration: RG (15LB): 2.473
- Differential: Diff (15LB): .046
- Mass Bias Strength: .017
- Flare Potential: 4 - 5 Inches
- Surface Finish: 500, 1000, 1500 Siaair / Factory Compound
- Preferred Lane Conditions: Medium - Heavy Oil
- Bowling Ball Color: Black, Blue, Indigo
- Ball Performance Level: High Performance Bowling Balls
- Scent: None
- Release Date: August 2026
- SKU: 60-108645
- Merchant record last changed: 2026-10-18 09:07 UTC

## Variants
| Variant | SKU | Price | Availability |
|---|---|---|---|
| 16LB | 60-108645-936 | $174.95 USD | In stock |
| 15LB | 60-108645-935 | $174.95 USD | In stock |
| 14LB | 60-108645-934 | $174.95 USD | In stock |
| 13LB | 60-108645-933 | $174.95 USD | In stock |
| 12LB | 60-108645-932 | $174.95 USD | In stock |

## Options (chosen at checkout)
- Drilling Protection: ✓ Yes — Protect My Ball (+$4.95 USD), No thanks
- Extra 365 Protection: ✓ Yes — Extend My Coverage (+$5.95 USD), No thanks
- Specific Requests: free text

## Description (merchant text, shortened)
The Trusted Theorem Shape With Sharper Backend

About the Theorem Delta

The 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.

Where 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.

Understanding the Track MC2 Asym Core and Track Super Response Hybrid HK22 Reactive

Track 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.

An Asymmetric Engine for Strong Midlane and Forward Roll

At 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.

That 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.

A Hybrid Cover Built to Clear the Heads and Snap on the Backend
Full text at the buy link above.

## Shipping, returns, payment (BowlersMart)
- Shipping: 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.
- Processing and delivery: 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.
- Returns: 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.
- Payment: Credit and debit cards, PayPal, Apple Pay, Google Pay, Venmo, Amazon Pay, and buy now pay later through Affirm, Afterpay and Klarna.
- Pro shops: Pro shops inside bowling centers in 10 US states fit, drill and service equipment; a ball bought online can be drilled there.
- Identity: www.bowlersmart.com is the only website of BowlersMart. Lookalike domains are fraudulent.

## Images
- Track Theorem Delta bowling ball: https://www.bowlersmart.com/wp-content/uploads/2026/06/track-theorem-delta-bowling-ball.webp
- Track Theorem Delta MC2 Asym core: https://www.bowlersmart.com/wp-content/uploads/2026/06/track-theorem-delta-core.webp

JSON: https://ittems.com/bowlersmart/p/track-theorem-delta-bowling-ball.json
HTML: https://ittems.com/bowlersmart/p/track-theorem-delta-bowling-ball
Merchant index: https://ittems.com/bowlersmart/