TruVativ PowerSpline Bottom Bracket - English (BSA), 73 x 118mm 29" It's compatible with Alpine ISO

It's compatible with Alpine ISO 5355 and GripWalk® boot soles ISO 23223 A

with a noticeably lighter swing weight

The Mountain Bound Boot Pack Plus features durable

Active ventilation: Allows you to open or close ventilation to modify the airflow and heat exhaust

Building on Hope’s 30+ years of manufacturing hubs

TruVativ PowerSpline Bottom Bracket - English (BSA), 73 x 118mm 29" It's compatible with Alpine ISOThe SRAM PowerSpline bottom bracket features a proprietary spline design used with many OE spec moderately priced TruVativ cranks. Crank bolts are included Heat treated chromoly 12 spline spindle to make sure it can go the distance with even the most demanding riders