United BMX Swerve 18 Tyre The United Direct tyre is our ultra fast high pressure tyre that was designed and developed with input from our team riders. The directional pattern features a wider centre for improved balance and stability and the whole tyre is covered with a fine micro knurling which will grip all surfaces at speed. Look no further if you want something fast and grippy which is perfect for street, park and even at the trails when used on the rear United Direct Bmx Tyre Features Black 18 Available in two sizes with a choice of side wall colours.