No it isn't legal.
You must have the same size rim and same size tyre on each axle.
ie. You can have 2 x 205 65 15's on the front and 2 x 235 45 17's on the rear
but you couldn't use 3 x 15" rims and 1 x 17" rim.
Chris.
ok thanks thats wat i was thinking chris. one of my mates dad is a highway patrol cop and he sed that i can drive it with 3 17 inch wheels and 1 15 inch as long as i go straight to a mechanics or sumwhere to get the last wheel off. cheers for your replies.
The 4 rims that are on my car are 17's but my spare is only a 15 so the couple of times that I've had a flat I have had to drive with one odd wheel but I get it fixed ASAP.