Promax EX-1 Alloy external Sealed Bottom Bracket 68/73mm Black CheckoutTitle=CeramicSpeed OSPW RS Alpha Pulley Wheel System for Shimano Dura-Ace 9250/Ultegra 8150 - ALPHA Aluminum Pulley Elasticized back for a comfortable

Elasticized back for a comfortable fit

A total of 9 valuable lens properties in one lens

Custom adjustable height pin

360mm length

} 35mm chassis with a focused all-mountain mindset - satisfyingly stiff

Promax EX-1 Alloy external Sealed Bottom Bracket 68/73mm Black CheckoutTitle=CeramicSpeed OSPW RS Alpha Pulley Wheel System for Shimano Dura-Ace 9250/Ultegra 8150 - ALPHA Aluminum Pulley Elasticized back for a comfortableEX 1 External bottom brackets feature cold forged and CNC machined alloy cups dual labyrinth bearing covers and precision sealed bearings. They are the perfect match to Promax CF 2 and HF 2 cranks and ultimate upgrade to the budget BBs sold with most crank sets. Fits all 24 millimeter bottom bracket spindles and frames with 68 or 73 x BC1. 37 bottom bracket shells Bottom Bracket Shell I. D. 1. 37 BB Frame Interface English BB Shell Width (mm) 73