Most reliable single-ring AM/DH 1x10sp crankset M820: 68/73mm shell (for 50.4mm chainline) M825: 83mm shell (for 57.9mm chainline) Durable, strong aluminum arms with anodized chainring for increased power transfer and impact protection Strongest HT2 steel integrated spindle, wide-stance bottom bracket with outboard bearings offer increased rigidity Optional/replacement chainrings in 34T, 36T and 38T (use BTI part # SH-22580/SH-22581/SH-25582) Includes HT2 bottom bracket for 68/73mm or 83mm shells (BB92 and BB30 adapter bearings available separately)