Seido T47 TRAC Bottom Brackets – Internal & External Engineered for Maximum Durability and PerformanceSeido T47 TRAC Bottom Brackets feature Twin Row Angular Contact (TRAC) bearings, designed to handle high loads and deliver exceptional stiffness. By adding a second row of balls in a compact 10mm bearing unit, these bottom brackets ensure long-lasting performance under demanding conditions, ideal for professional bike manufacturers, distributors, and workshops. Product Variants: Seido T47 TRAC BB / Internal Type: Internal Color: Black Cup Material: Aluminum Spindle Size: 30 mm Compatible BB Shell Width: 85.5 / 86.5 mm Tool Interface: T47 52-16 Tool Bearings: 3806, 30 x 42 x 10 mm Extra Info: Adaptable to 29, 24, and 24/22 mm with TRAC spindle adapters Included: 2 x 2 mm washers, 4 x 0.5 mm washers, 1 x wave washer Weight: 130 g Seido T47 TRAC BB / External Type: External Color: Black Cup Material: Aluminum Spindle Size: 30 mm Compatible BB Shell Width: 68 mm Tool Interface: T47 52-16 Tool Bearings: 3806, 30 x 42 x 10 mm Extra Info: Adaptable to 29, 24, and 24/22 mm with TRAC spindle adapters Included: 6 x 0.5 mm washers, 1 x wave washer Weight: 154 g