Thun bottom bracket "Efficient Jive" SB-packed, 4-edge 68 mm housing width, Thompson, shell diameter 40 mm, durable, maintenance-free, and weather-resistant. Left bearing shell with functional shoulder, shaft made of specially hardened material, certification: ISO 4210-8:2014 (MTB). Optimal rotational quality due to double sealed deep groove ball bearings, galvanized steel sleeve to protect the inner bearing. Press-in shell made of composite D, includes 2 hexagon socket screws with polyamide stain coating and clip ring. Installation note: tightening torque for screws is 45 Nm. Made in Germany.