Storm Concept Bowling Ball

Every reactive bowling ball follows the same design logic. The core drives the motion shape — RG determines how early the ball transitions, differential determines how aggressively it flares, and asymmetry adds directional bias if the designer wants it. The coverstock tunes the surface response: solid for earlier friction, pearl for length, hybrid for somewhere between the two. That’s the framework. Every manufacturer uses it.

Storm’s SPI Lab Series exists to challenge that framework. The Concept doesn’t start with the core. It starts with the cover.

The ARC Pearl coverstock runs at the USBC maximum for coefficient of friction and oil absorption time — both limits simultaneously. It grips the lane aggressively from the moment it contacts friction. It absorbs oil at the highest rate the rules permit. The cover is doing the work of both the engine and the tires. The Radius Weight Block — with a 2.61 RG and 0.020 differential at 15 lbs — is deliberately conservative. Its job is traction control: keeping the ball on line, preventing it from locking up or rolling forward, letting the coverstock drive the motion without the core fighting it.

The outcome is a reaction shape that fills a specific gap. It behaves like urethane on short patterns and demanding conditions. It doesn’t carry oil down the lane the way urethane does. And it hits harder than urethane, because the reactive construction and the two-piece thick resin shell generate a coefficient of restitution that urethane can’t match.

• Series: SPI Lab
• Core Name: Radius Weight Block
• Core Type: Symmetric
• Coverstock: ARC Pearl Reactive
• Factory Finish: 1000 Abralon
• RG (15 lb): 2.61
• Differential (15 lb): 0.020
• Intermediate Differential: N/A
• Flare Potential: Low
• Lane Condition: Short patterns / Demanding conditions
• Color: Teal / Imperial Blue
• Fragrance: Blueberry Fritter
• Available Weights: 12–16 lb