Shimano designed the Saint FC-M815-1 Crankset for the increasing number of downhill and freeride bikes with wider bottom bracket shells. Made for 83mm bottom brackets and 57.5mm chainlines, this crankset works with a single chainring and bashguard configuration. Any four-arm 104mm BCD bashguard will fit. The included SM-BB80 bottom bracket features cups with longer threads so it will comply with any aftermarket chain guide system.