What is the largest wheel I can run at stock ride height on my '93 Subaru Legacy wagon?

Are you talking about diameter or width? I have 16x7 on my 93. I run a 55 series tire. Tire Rack sells 18s for the 93 Legacy, I'm guessing a 35 series. Tire Rack has decent prices and the stuff I've bought from them last time showed up on my door the next day. Don't opt for expensive shipping options. The standard rate gets to you in no time.
http://www.tirerack.com/wheels/index.jsp
ByronP

Im not so sure about the 90-94's, but the 97-99's will run a 215 at most, but i have see 225 with lowering