As far as wheel and tire combination together, they will only fit the focus and c30. The tires themselves are way too small to be bolting onto one of the larger vehicles you mentioned. The 205/55/16 tires probably won't handle the added weight of the larger platforms either, which could be dangerous by causing a highway blowout.

The wheel itself can be bolted onto several platforms, assuming they will clear the brake calipers (which they will not clear the 2014 and newer ST front brakes). I could easily dig up bolt pattern, hub bore, and offset comparisons, but there isn't a good database for brake caliper clearance other than people out in the world that have verified fitment themselves.

 

Quick answer, the wheels and tires should be good for the Focus, C1 platform Volvo's C30, S40, V50, C70, and maybe the Ford Transit as well. They'll fit plenty of other cars like the fusion, escape, S60, etc. but the tires will be a little small on the diameter.

As far as wheel and tire combination together, they will only fit the focus and c30. The tires themselves are way too small to be bolting onto one of the larger vehicles you mentioned. The 205/55/16 tires probably won't handle the added weight of the larger platforms either, which could be dangerous by causing a highway blowout.

The wheel itself can be bolted onto several platforms, assuming they will clear the brake calipers (which they will not clear the 2014 and newer ST front brakes). I could easily dig up bolt pattern, hub bore, and offset comparisons, but there isn't a good database for brake caliper clearance other than people out in the world that have verified fitment themselves.

They'll be the same size on the rest of the C1 platform Volvo's, not just the C30. So C30, S40, V50, C70 are all the same tire size.

 

Usually if someone is shopping specifically for focus wheels, they will know if they fit their platform.
There are cars from Ferrari that use 16" and 5x108 but none of them would be seen alive with focus wheels 😂
Obviously the easiest sale is gonna be on another focus, plenty of them out there and especially heading into winter looking for a second set