Rollerblade 90mm Wheel Kit | Sports & Outdoors | Outdoor Recreation | Skates, Skateboards & Scooters | Inline & Roller Skating | Inline Skate Parts | Wheels | Wheels are measured in mm (height size) and a (durometer/Hardness). a higher "mm" number means faster wheels. A higher durometer "a" number means harder wheels. Harder wheels last longer | 90mm/84a wheels provide excellent performance with value | Includes SG9 bearings and spacers for convenient replacement | Less friction and increased speed are two of the main benefits from the SG9 silicone/grease mixture | The level of precision, tolerance and speed is indicated by the number at the end of the bearing. The higher the number, the greater the level
Weight: 1043.2615999999998 g