Shimano acera 8 speed cassette 1134 cshg418134 hg40 chain combo deal shimano acera mountain bike 8 speed cassette 1134 high quality 8 speed cassette hyperglide sprockets have a computer designed tooth configuration with contoured shift gates resulting in a crisp smooth shift even under load gearing gives a low 34t sprocket making it easier to climb even the steepest of hills sprockets are cut away to reduce weight without reducing rigidity nickel plated finish offers hard wearing resistance