Mountain bike groupsets: everything you need to know - BikeRadar
Amazon.com : JGbike Crank Arm Set Mountain Bike Crankset Arm Set 170mm 104 BCD with 68 73 Bottom Bracket Kit and Chainring Bolts for MTB BMX Road Bicyle,Compatible with Shimano,SRAM,FSA, Gaint :
Shimano Altus 7-8 Spd Square Taper Crankset - Black - Cambria Bike