Fifteen52 R43 by Ken BlockFifteen52 R43 by Ken Block – With its reversed spoke-window cut outs and blocky stature, the fifteen52 (Tarmac) R43 wheel makes a bold statement. This cast monoblock design was inspired by the wheel that Ken Block uses on his Hoonicorn Mustang. This first appeared in Gymkhana SEVEN. Ken Blocks logo appears on the back of every wheel. Available in Block Bronze or Carbon Grey, each R43 wheel has the Ken Block “Block Skull” stamp of approval on the reverse of the wheel.