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Roto Grip Tour Dynam-X

Photo and specs courtesy of bowling.com. Reproduced with credit to the maker.

How it moves

Foul lineArrows · 15 ft40 ft · board 83.9° entry
Arcing turn (symmetric core). Dotted is skid, then the turn, then the roll into the pocket. Estimated from the coverstock, finish, core, and differential for a right-handed bowler with medium revs on a house shot. Lane conditions, speed, and layout move all of this.
Roto Grip

Tour Dynam-X

Discontinued
Hook potential6.5 (est.)6.5 of 10, estimated

How much the ball wants to hook, 1 (straight, a spare ball) to 10 (the strongest oil-eaters). The maker publishes no number for this ball, so this is estimated from the coverstock, core, finish, and differential.

Coverstock
TourTrax Solid Reactive
Reactive solid
Core
Rondure Tour
Factory finish
2000-grit Abralon
Color
Dark Cyan / Onyx
Released
2023-08-01
USBC
Approved 2023-06-20

Weights and specs

WeightRGDifferentialInt. diff
15 lb2.470.026—

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
2000-grit Abralon. Sanded then smoothed (1500 to 3000 grit): enough tooth for oil, enough gloss to get down the lane. Most box finishes. Surface changes over games, and a pro shop can take any ball either way with a pad.