Park tools bmx flip flop double sided freewheel remover is part of a comprehensive range of freewheel removal tools the oversized centre hole and thin wall design allows use without removal of cones and locknuts it is investment cast and heat treated for strength and durability the one inch base fits end of sr 1 frw 1 park tools or simply an adjustable wrench or bench vice the fr 8 is designed to remove four notch freewheels from flip flop bmx hubs with 30 x 1 mm threads such as the ac fa