In Reply to: TRX 390's on 535is posted by K Torres on April 03, 1999 at 11:00:22:
No, you can't. It says right on the wheel that you can only use 390mm tires.
Why would you even consider it as possible?
Since tires are rubber, why not use cheaper 14" and stretch them? Why not spray several cans of undercoating on the wheel instead of using a tire?