Truvativ descendant carbon mtb crankset bb30the truvativ descendant carbon bb30 mtb crankset harnesses srams own carbon construction process to provide a crankset that is low enough in weight for xc racing but still strong and durable enough for more aggressive enduro riding it also comes equipped with a sram x sync 1x chainring which ensures ultimate engagement with the chain consistent performance in all conditions and reliable chain retention over all terrain types features arm mate