They’re closely matched: both forged, both 18×9, both offering street and all-terrain tire choices. The UP-03 here is described around three clear specs including a dedicated Off Road Spec, while the 18-inch UP-05 package brings the Selipanov Y-spoke with signature engraving. If you want the explicit off-road-spec framing, this UP-03; if you want the Y-spoke design, the UP-05. Capability is essentially the same.
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