SRAM PG1170 11-Speed Bicycle Cassette, 11-28T Stems Aramid is used for the

Aramid is used for the tire beads for the same reason that it's used for bullet-proof vests -- its lightweight

and assembled in the USA

engineered to provide both UV protection and ultralight insulation

resulting in improved grip in cold temperatures

ISO Diameter: 622 / Road / 29"

SRAM PG1170 11-Speed Bicycle Cassette, 11-28T Stems Aramid is used for theThe new SRAM PG1170 Power Glide cassette is light, and delivers an undeniable performance advantage. It's the final piece in the drivetrain puzzle, paired with the new SRAM FORCE22, 11 speed, rear derailleur, delivers ultra fast, ultra quiet shifts that will always put you in the right gear.