Ultimate chain retention. All conditions.The Renthal 1XR chainring tooth profiling ensures the highest level of chain retention, in all conditions. Alternating 1.8 / 3.5mm width teeth interlock with the chain for ultimate security, with no loss of efficiency. The reduced frontal profile of the 3.5mm wide teeth increases mud clearance for the inner chain plates and extends longevity. Durability of the hard wearing 7075 T6 aluminium construction is maximised with a hard anodised surface treatment and mud evacuation grooves in the tooth bed.Specifically designed to fit 2016 Shimano XTR (M9000) and XT (M8000) cranksets.Features:Alternating 1.8 / 3.5mm width teeth. Offset spacing for correct chainline.CNC machined 7075 T6 Aluminum.Hard anodised surface finishMud grooves in the tooth bedUltra stiff I-Beam cross sectionMud clearance and wear-proof profiling96mm BCD for 2016 Shimano XTR (M9000) and XT (M8000) cranksets.Sizes: 30, 32, 34, 36t.Weight:30t 40g32t 42g34t 46g36t 50g