Easily convert our PISTON® SR roof rack into a burly

Direct mount chainrings in 38T through 46T

leaving a comfortable spot to park those sunglass arms

Self-cooling mechanisms including a patented fan design keeps the unit performing better

Slick cables are die-extruded for smooth operation

ROCKY MOUNTAIN 2025 Growler 40 - Shimano Kit Color:- Blue / Yellow / Black Easily convert our PISTON® SRThe Growler proves that the secret order of hardtail trail shredders is alive and thriving. Sure, its got that classic hardtail profile. But 21st century touches across the platform reveal a future proofed, instant classic. 29x2. 6 tires for ridiculous grip. An aggressive ride character for surprising levels of confidence while descending or ripping tough trails. A refreshingly simple (and tough) package for rowdy days at the trails. More satisfying