The Wheels Manufacturing sealed bearing units are very first quality replacement part, and fit most hubs currently in use. TECH SPECSBearing GradeABEC 3NumberMR 18307Bearing Dimensions18x30x7mmMaterialSteel
| Bearing Grade | ABEC 3 |
| Number | MR 18307 |
| Bearing Dimensions | 18x30x7mm |
| Material | Steel |
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