We (Ian and I) had a long debate about this.
Several Zeds in the states have 11 x 19 front wheels fitted the first thing is offset the ones Ian sold (gave ) me are ET 25 the will not physically fit on the front as the inside face hits the suspension!
Now in the states they are using 4-8 offset so that would go on then they usually have very stretched tyres - what I can understand is how they still fit under the arches!
I know they run mad camber angles but the wheel sticks out 2 inches - if you camber that out the wheel is at a mad angle - I just got some 8.5 matching alloys for the front in the end.
I think some yanks have done 11" up front? It may be possible, i'm not sure what offsets though.
They've definitely done 10.5" as above.
Bloody tight fit though