Key features

• •Complete Bike Bearing Repair Kit: this set includes 50 bike ball bearings (5 pieces each of 10 sizes) from 4mm to 8mm (1/6" to 1/3"), covering all standard bicycle headset and crank maintenance needs for mountain bikes, road bikes, and scooters
• •Universal Compatibility for Multiple Bike: these versatile headset bearings fit most bicycle models including mountain, road, folding, and BMX bikes; The comprehensive size selection ensures you'll find the perfectly match for your repair project
• •Steel Ball Bearings: our bicycle bearings feature reliable steel construction with smooth-rolling balls and reinforced retainers that withstand high-speed rotation and loads while maintaining consistent performance; The bearings arrive pre-lubricated with grease for smooth operation right out of the box; This factory treatment extends bearing life and reduces maintenance requirements
• •Package Includes: 5 x 1Ball Bearing Retainer (OD: 20MM, ID: 11MM, Ball Dia: 5mm); 5 x 2Ball Bearing Retainer (OD: 25MM, ID: 12MM, Ball Dia: 6mm); 5 x 3Ball Bearing Retainer (OD: 29MM, ID: 18MM, Ball Dia: 6.35mm); 5 x 4Ball Bearing Retainer (OD: 37MM, ID: 29MM, Ball Dia: 4mm); 5 x 5Ball Bearing Retainer (OD: 40MM, ID: 32MM, Ball Dia: 4mm)
• •Supplement Includes: 5 X 6Ball Bearing Retainer (OD: 31MM, ID: 22MM, Ball Dia: 5mm); 5 x 7Ball Bearing Retainer (OD: 38MM, ID: 24MM, Ball Dia: 8mm); 5 x 8Ball Bearing Retainer (OD: 45MM, ID: 31MM, Ball Dia: 8mm); 5 x 9Ball Bearing Retainer (OD: 34MM, ID: 23MM, Ball Dia: 6mm); 5 x 10Ball Bearing Retainer (OD: 37MM, ID: 27MM, Ball Dia: 4mm)