The xt m8000 single 148mm boost crankset without chainring from shimano is a high performance crankset with a plus 3mm outboard chainline for use with 148mm rear axle widths the cranks are forged hollowtech ii aluminium to offer unrivalled strength to weight ratio and a 70 degree spider arm for optimal rigidity this set contains cranks only and must be run with sm crm80 dce chainrings and 11 speed hg x mtb chains it has a 518 mm chain line for use with 148mm boost rear axle widths and the st