TheSram PG-1230 Eagle 12-Speed Cassette. Ride anywhere with the wide-range pg-1230, 11 to 50-tooth eagle™ cassette. The nx cassette gives riders every bit of the climbing range that the eagle™ ecosystem affords with a simple upgrade to splined-drive body wheels. The pg-1230 is the only eagle™ cassette designed to be durable enough to withstand the […]