Kenda Kontact 18 x 2.0 (K841) All Black Wire Bead Park & Street Freestyle Tire. Kenda Kontact 18 x 2.0 (K841) All Black Wire Bead Park & Street Freestyle Tire. Famous Kenda Knotact tire in a hard to find 18" size ! Great Freestyle & Park Tire ! Great All Arounder ! Kenda Kontact BMX tire features a wrap around tread design with a knurled surface for better traction and control. Wire bead, 40 - 65PSI, BMX Freestyle Directional tire with large lean-over angle. ISO Diameter: 335. ISO Width: 52 mm.