Speedline Spinners | T47 External Sealed Bearing Bottom Bracket

Conquer the track with maximum power transfer and smooth rolling resistance. Engineered specifically for Speedline Cranks and built to withstand the explosive torque of BMX racing, this M47 T47-style Bottom Bracket Kit eliminates flex and creaking so every watt of pedal power goes straight to the rear wheel. Key Features Built for Speedline Cranks: Perfectly matches 30mm spindle cranksets for a rock-solid, high-rigidity setup. Precision M47 Threading: Features precision-machined $M47 \times P1.0$ alloy cups to secure firmly into the shell, eliminating power-robbing creaks under heavy gate starts and sprinting. High-Efficiency Bearings: Loaded with smooth-spinning 6806 sealed bearings ($30 \times 42 \times 7\text{mm}$) and dual rubber/alloy dust covers to keep dirt, water, and track grit out. Lightweight Advantage: Tipping the scales at just 116g, it sheds weight from your drivetrain without sacrificing strength or durability. Flexible Shell Compatibility: Fits 68mm to 73mm BB shells (with an overall assembly width up to 86.5mm). What’s Included 1x Nylon Inner Sleeve 1x Rubber O-Ring ($34 \times 1.0\text{mm}$) 1x Left Alloy Cup (AL6061, Left-Hand Thread $M47 \times P1.0\text{-L}$) 1x Right Alloy Cup (AL6061, Right-Hand Thread $M47 \times P1.0$) 2x Precision Sealed Bearings (6806 / $30 \times 42 \times 7\text{mm}$) 2x Dust Covers (Rubber + Alloy) 1x DF30 Wave Washer Tech Specs Spindle Size: 30mm BB Shell Width: 68mm – 73mm (86.5mm overall) Thread Pitch: $M47 \times P1.0$ Material: AL6061 Alloy Cups & Nylon Sleeve Weight: 116g (Bottom Bracket Assembly) Wrench comes with the Speedline Spinner BB kit