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Roto Grip Riot

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

How it moves

Foul lineArrows · 15 ft41 ft · board 6.54.9° 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

Riot

Discontinued
Hook potential7.5 (est.)7.5 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
Ultimate Vision Solid Reactive
Reactive solid
Core
Not listed
Factory finish
Not listed
Color
Not listed
Released
2010-02-01
USBC
Approved 2010-01-01

Weights and specs

WeightRGDifferentialInt. diff
15 lb———

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
Coarse surfaces grip through oil and hook early; fine or polished surfaces skid longer and hook later. Surface changes over games, and a pro shop can take any ball either way with a pad.