Bowling ball core · 900 Global
900 Global Ellipse Asymmetric A.I. Core
Asymmetric 900 Global core
An asymmetric core with early rev-up and medium flare, built for medium to heavy oil. 1 of the 2 balls with this core are in stock at BowlersMart.
- Asymmetric
- RG 2.480
- Diff 0.050
- MB 0.020

Specs
RG AT 15 LB
2.480
Early rev-up
15% of the reactive and urethane balls we stock have a lower RG.
DIFFERENTIAL AT 15 LB
0.050
Medium flare
62% of the reactive and urethane balls we stock have a lower differential.
MASS BIAS AT 15 LB
0.020
Strong asymmetry
86% of the asymmetric reactive and urethane balls we stock have a lower mass bias.
| Weight | RG | DifferentialDiff | Mass biasMB |
|---|---|---|---|
| 16 lb | 2.470 | 0.050 | 0.020 |
| 15 lbUsed on this page | 2.480 | 0.050 | 0.020 |
| 14 lb | 2.490 | 0.050 | 0.020 |
| 13 lb | 2.560 | 0.034 | 0.011 |
| 12 lb | 2.580 | 0.031 | 0.009 |
Source: 900 Global published specs, as listed on the 900 Global Origin EX 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 Ellipse Asymmetric A.I. Core
1 of the 2 balls with the 900 Global Ellipse Asymmetric A.I. Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

900 Global RB 89 Solid Reactive
Medium to heavy oil
Show 1 ball no longer available at BowlersMart
| Ball | Cover | First seen |
|---|---|---|
| 900 Global Origin Bowling Ball | 900 Global RB 93 Hybrid Reactive | November 2024 |
Where the 900 Global Ellipse Asymmetric 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 | Asymmetric | 2.480 | 0.050 | Same RG and differential |
|
|
Roto Grip | Symmetric | 2.480 | 0.050 | Same RG and differential |
|
|
Storm | Symmetric | 2.480 | 0.051 | RG 0.000 · Diff +0.001 |
|
|
Radical | Asymmetric | 2.480 | 0.052 | RG 0.000 · Diff +0.002 |
|
|
Radical | Symmetric | 2.485 | 0.051 | RG +0.005 · Diff +0.001 |
|
|
Ebonite | Symmetric | 2.480 | 0.048 | RG 0.000 · 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 Ellipse Asymmetric A.I. Core1 of the 2 balls with the 900 Global Ellipse Asymmetric A.I. Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.
Questions bowlers ask
What is the RG of the 900 Global Ellipse Asymmetric A.I. Core?
At 15 lb the 900 Global Ellipse Asymmetric A.I. Core has an RG of 2.480. It ranges from 2.470 to 2.580 across the listed weights.
What is the 14 lb RG of the 900 Global Ellipse Asymmetric A.I. Core?
At 14 lb the RG is 2.490.
What is the differential of the 900 Global Ellipse Asymmetric A.I. Core?
At 15 lb the differential is 0.050. The mass bias is 0.020.
Which bowling balls use the 900 Global Ellipse Asymmetric A.I. Core?
900 Global Origin EX Bowling Ball, 900 Global Origin Bowling Ball. 1 are in stock now.
How do the 900 Global Ellipse Asymmetric A.I. Core specs change by weight?
At 16 lb: RG 2.470, differential 0.050, mass bias 0.020. At 12 lb: RG 2.580, differential 0.031, mass bias 0.009.
How does the 900 Global Ellipse Asymmetric 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 Origin EX 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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