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Roto Grip Retro RG Spare

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

How it moves

Foul lineArrows · 15 ft1° entry
Straight (spare ball). 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

Retro RG Spare

Discontinued
Hook potential1 (est.)1 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
High-Impact Pearl Urethane
Urethane
Core
Storm Traditional 3-piece
Symmetric
Factory finish
3500 Polished
Color
Charcoal
Released
2023-05-19
USBC
Approved 2022-10-18

Weights and specs

WeightRGDifferentialInt. diff
12 lb2.720.005—
13 lb2.710.005—
14 lb2.690.006—
15 lb2.690.006—
16 lb2.680.006—

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
3500 Polished. Skims the oil and saves its energy for the dry part of the lane: longer skid, later and sharper hook. Polished and pearl balls. Surface changes over games, and a pro shop can take any ball either way with a pad.

Balls like this

Same coverstock and core type; the closest company for this ball in a bag.