I've done it as well
My Ingredients:
2008 Kona Stinky/Deluxe build
Fox DHX 5.0 with 600lb./in. rear spring
Extra stiff front springs on Marz 888
Crystalyte 5303 Rear with Disc
Flat Road with little wind
C-Lyte 4840 Controller
LifePO4 48V 20AH Battery
MAX SPEED 65.1 KPH (40.451 MPH)
MaxAmps 50+