Bowling ball core · 900 Global
900 Global Blast A.I. Core
Symmetric 900 Global core
A symmetric core with early rev-up and high flare, built for medium to heavy oil. 2 of the 2 balls with this core are in stock at BowlersMart.
- Symmetric
- RG 2.470
- Diff 0.055

Specs
RG AT 15 LB
2.470
Early rev-up
2% of the reactive and urethane balls we stock have a lower RG.
DIFFERENTIAL AT 15 LB
0.055
High flare
87% of the reactive and urethane balls we stock have a lower differential.
MASS BIAS AT 15 LB
None
Symmetric core
Symmetric cores have no mass bias marker to place when drilling.
| Weight | RG | DifferentialDiff | Mass biasMB |
|---|---|---|---|
| 16 lb | 2.460 | 0.056 | None |
| 15 lbUsed on this page | 2.470 | 0.055 | None |
| 14 lb | 2.480 | 0.056 | None |
| 13 lb | 2.580 | 0.047 | None |
| 12 lb | 2.640 | 0.037 | None |
Source: 900 Global published specs, as listed on the 900 Global Vengeance Returns product page. RG and differential change with ball weight; use the row for the weight you throw. The highlighted 15 lb row is the one used on this page.
Balls with the 900 Global Blast A.I. Core
2 of the 2 balls with the 900 Global Blast A.I. Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.
Solid covers
Solid covers grip the lane soonest and suit heavier oil.

900 Global RB 91 Solid Reactive
Medium to heavy oil
Hybrid covers
Hybrid covers mix solid grip with pearl length.

900 Global RB 91 Hybrid Reactive
Medium to heavy oil
Where the 900 Global Blast A.I. sits
Each dot is a core in balls we stock. Cores close together roll alike; the cover and layout decide the rest.
Navy ring = a ball in your bag. Dashed ring = off this chart, or this same core.
Nearest cores, zoomed in
Navy ring = a ball in your bag. Dashed ring = off this chart, or this same core.
This core 1 Nearest cores Other cores
| Core | Brand | Shape | RG | Diff | vs this core |
|---|---|---|---|---|---|
|
|
Motiv | Symmetric | 2.470 | 0.055 | Same RG and differential |
|
|
Storm | Asymmetric | 2.470 | 0.055 | Same RG and differential |
|
|
Motiv | Asymmetric | 2.470 | 0.054 | RG 0.000 · Diff −0.001 |
|
|
Ebonite | Asymmetric | 2.466 | 0.056 | RG −0.004 · Diff +0.001 |
|
|
Motiv | Symmetric | 2.480 | 0.055 | RG +0.010 · Diff 0.000 |
|
|
Ebonite | Asymmetric | 2.473 | 0.053 | RG +0.003 · Diff −0.002 |
Matches use 15 lb RG and differential.
Drilling and tools
Turn on JavaScript to compare with your ball.Balls with the 900 Global Blast A.I. Core2 of the 2 balls with the 900 Global Blast A.I. Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.Solid coversSolid covers grip the lane soonest and suit heavier oil.
Questions bowlers ask
What is the RG of the 900 Global Blast A.I. Core?
At 15 lb the 900 Global Blast A.I. Core has an RG of 2.470. It ranges from 2.460 to 2.640 across the listed weights.
What is the 14 lb RG of the 900 Global Blast A.I. Core?
At 14 lb the RG is 2.480.
What is the differential of the 900 Global Blast A.I. Core?
At 15 lb the differential is 0.055. This is a symmetric core, so mass bias is not applicable.
Which bowling balls use the 900 Global Blast A.I. Core?
900 Global Vengeance Returns Bowling Ball, 900 Global Vengeance Bowling Ball. 2 are in stock now.
How do the 900 Global Blast A.I. Core specs change by weight?
At 16 lb: RG 2.460, differential 0.056. At 12 lb: RG 2.640, differential 0.037.
How does the 900 Global Blast A.I. Core compare with my ball?
Type the ball you throw into the Compare with your ball box on this page. It shows the RG and differential side by side and saves your bag for every core page.
Sources and method
Specs. 900 Global published specs, as listed on the 900 Global Vengeance Returns product page, as published by the manufacturer.
Baseline. The baseline is 212 in-stock, published reactive and urethane balls. Plastic and polyester covers, 2-piece, 3-piece and pancake cores, missing covers and missing RG or differential values are excluded.
Percentiles. Percentiles are the share of baseline balls with a strictly lower or higher value; ties are not counted.
Nearest cores. Nearest cores are ranked by distance on standardized 15 lb RG and differential, with the same symmetric or asymmetric shape preferred among near ties (distance bands of 0.1).
Mass bias. Mass bias is compared among asymmetric balls with numeric mass bias only.
Updated. Catalog and page updated 2026-10-16.


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