Bowling arsenal builder

How the builder judges your bag

It sorts your balls by cover type, because the cover decides how early a ball grips the lane, and checks each kind of lane condition against what the sources say each cover is for:

• Fresh or heavy oil: a solid reactive. Storm calls solid covers "particularly effective on fresh oil patterns," and bowling.com says solids are best on heavier oil.
• A bit of everything: a hybrid reactive. Storm says hybrids suit bowlers who need a ball "that can adapt to a variety of lane conditions."
• Medium to dry, or breaking-down lanes: a pearl reactive. bowling.com calls pearls best on medium to dry lanes, and USBC's lane guide says a weaker ball that skids farther may help as the lanes break down.
• Short patterns: urethane, which Storm lists for "playing on shorter oil patterns."
• Spares: a plastic ball, thrown straight. In USBC's spare-shooting clinic, Gold coach Michelle Mullen teaches a plastic spare ball that barely hooks, so the lane oil stops mattering. Our spare calculator shows where to stand.

The chart plots each ball's RG against its differential, with every current ball in our table in the background. Storm says a low RG ball revs up sooner and a high differential gives a sharper entry angle. Two balls with the same cover and nearly the same numbers may do the same job, and the builder points those out.

Common questions

How many bowling balls should I have?

There is no set number. Start with a reactive strike ball and a plastic spare ball; add balls when you meet lanes your bag doesn't handle. The arsenal builder shows which kinds of lane your balls cover and which they don't.

What balls make a good arsenal?

Balls that differ. A solid reactive for fresh or heavy oil, a pearl for drier or breaking-down lanes, a hybrid between them, often urethane for short patterns, and a plastic spare ball. Two balls with the same cover type and nearly the same numbers may overlap.

Is my arsenal saved?

Yes, in your browser. If you sign in to a free Bowl Revolution account, it also syncs to your account so every device sees the same bag.

Sources: Storm, "The Coverstock" and "Inside The Bowling Ball"; bowling.com, coverstock FAQ; USBC, Reading The Lane; Michelle Mullen, USBC spare-shooting clinic. Ball numbers from maker product pages, checked 21 October 2026.