The Uni Lug is specifically designed for the "CLOSED CENTRE " tyres. The hole in the centre of the rim is not big enough to fit over the wheel balancer shaft. This adaptor allows these wheels to be balanced. The most notable feature of these rims is that they are hub located (that’s why the centring rings are required) and the wheel nuts have no taper (the UniLug nut as a rounded end for this).

When ordering please specify model of balancer and shaft size if known.