Step Up / Step Down Dual Wheels

A design enabling two wheels of different diameters to be dualled together when the two tyres have a similar static loaded radius

Generally uses a smaller and narrower wheel and tyre as the dual. For example, a 13.6 R 48 dual tyre alongside a 20.8 R 38 tractor tyre will reduce the overall vehicle width to match an implement or make roadwork easier, or a 20.8 R 42 dual tyre alongside a 710/70 R 38 tractor tyre offers less expensive dualling than using two 710 tyres.