...for what its worth i put HPI 2.2 'truck' rims and tires on my Dark Impact...I loved it...I think the ZX-5 is a 'regular' 12mm hub...not sure about the Losi as we cant get them here but i thought all Losi were pins instead of hexes ? Isnt that whyProline has more 'pinned' rims than hubs? Especially for the smaller scales (1:10 et al) Sorry if this isnt what you needed...