Sram gx 1000 11 speed chainset bb30the sram gx 1000 bb30 11 speed offers the slightly more budget conscious mtb enthusiasts a strong and reliable chainset with the same high quality chainring as seen on its bigger brothers the gx 1000s is equipped with srams x sync 1x chainring which provides unrivalled durability and chain retention even over the roughest terrain and all without a chainguide or front derailleur in sight features arm materialal6000 aluminium chainring materialcnc mac