Joined: Jan 2009
Posts: 44,225
Likes: 6,484
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
Don't worry about tires being too wide for your rims. It is rarely a problem. As [MENTION=339610]Darth Lefty[/MENTION] says, the frame and fork clearances are probably your real limitations.
I've typically used 25 or 28 mm tires, but recently, I've gone to 32 and 35 mm tires, and I like it, especially now that I've found out how low I can let the pressure be. On my 35 mm tires, I'm using something like 50 or 60 psi. Very nice. I'm using Panaracer Pasela steel bead tires on a Bianchi Volpe, a fairly heavy bike.