I was wondering does this look like a 18 in rim for a first gen guy says it is but I'm new to vmaxs and looks kinda off but I could be wrong any help would be appreciated
The front rim is 18" in diameter.
The rear rim is 15" in diameter.
Those are the stock sizes.
If you are looking to change your rim size, you might want to look at 17" rims designed for the Gen 1 Vmax.
Provided the centre hub (arrowed) of the OE wheel fits the same onto the 18" then IMO it should work OK.
That said I don't recall how the centre 'hub' is attached so I stand to be corrected.