Bowling ball core · Ebonite
Ebonite Turbo Core
The core inside the Ebonite Turbo X line
A symmetric core with mid-lane rev-up and medium flare, built for dry to medium oil. 3 of the 3 balls with this core are in stock at BowlersMart.
- Symmetric
- RG 2.517
- Diff 0.040

Specs
RG AT 15 LB
2.517
Mid-lane rev-up
60% of the reactive and urethane balls we stock have a lower RG.
DIFFERENTIAL AT 15 LB
0.040
Medium flare
34% 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 | 2.527 | 0.035 | None |
| 15 lbUsed on this page | 2.517 | 0.040 | None |
| 14 lb | 2.554 | 0.040 | None |
| 13 lb | 2.574 | 0.040 | None |
| 12 lb | 2.597 | 0.040 | None |
Source: Ebonite published specs, as listed on the Ebonite Turbo X Pearl 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 Ebonite Turbo Core
3 of the 3 balls with the Ebonite Turbo 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.

Ebonite GB 10.7 Solid Reactive
Medium to heavy oil
Pearl covers
Pearl covers go longer and turn harder at the end, best on medium oil.

Ebonite HK22 GB 10.7 Pearl Reactive
Light to medium oil
Urethane covers
Urethane gives a smooth, controllable arc for drier lanes and short patterns.

Ebonite NU Active
Dry to medium oil
Where the Ebonite Turbo 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.
Same family: Ebonite Turbo/R Core
This core 1 Nearest cores Other cores
| Core | Brand | Shape | RG | Diff | vs this core |
|---|---|---|---|---|---|
|
|
Brunswick | Symmetric | 2.524 | 0.038 | RG +0.007 · Diff −0.002 |
|
|
Hammer | Symmetric | 2.510 | 0.042 | RG −0.007 · Diff +0.002 |
|
|
Storm | Symmetric | 2.530 | 0.042 | RG +0.013 · Diff +0.002 |
|
|
Roto Grip | Symmetric | 2.500 | 0.042 | RG −0.017 · Diff +0.002 |
|
|
SWAG | Symmetric | 2.500 | 0.042 | RG −0.017 · Diff +0.002 |
|
|
DV8 | Asymmetric | 2.499 | 0.040 | RG −0.018 · Diff 0.000 |
Matches use 15 lb RG and differential.
Drilling and tools
Turn on JavaScript to compare with your ball.Balls with the Ebonite Turbo Core3 of the 3 balls with the Ebonite Turbo 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 Ebonite Turbo Core?
At 15 lb the Ebonite Turbo Core has an RG of 2.517. It ranges from 2.517 to 2.597 across the listed weights.
What is the 14 lb RG of the Ebonite Turbo Core?
At 14 lb the RG is 2.554.
What is the differential of the Ebonite Turbo Core?
At 15 lb the differential is 0.040. This is a symmetric core, so mass bias is not applicable.
Which bowling balls use the Ebonite Turbo Core?
Ebonite Turbo X Pearl Bowling Ball, Ebonite Turbo X NU Bowling Ball, Ebonite Turbo X Bowling Ball. 3 are in stock now.
How do the Ebonite Turbo Core specs change by weight?
At 16 lb: RG 2.527, differential 0.035. At 12 lb: RG 2.597, differential 0.040.
How does the Ebonite Turbo 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. Ebonite published specs, as listed on the Ebonite Turbo X Pearl 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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