Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
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If the rim is 25mm wide then you should get something a little wider. 700c tires are commonly available in 28mm, 32mm, 35mm, 38mm, 40mm (as well as narrower like 25mm, 23mm and 20mm, and many many in-between sizes). Choose a width based on the terrain you will be riding. IMHO, 28mm wide tires are enough to tackle all but the nastiest pavement if you are not too heavy or carrying too much of a load, 32mm wide are good for rough roads or smooth unpaved trails, or to run a little lower tire pressure for a softer ride on pavement. Wider tires than 32mm are still OK on pavement but can be used for quite rough terrain. Go to the LBS and see what they have in stock.
I weigh 260 lbs, carry 15 or 20 lbs of luggage on my 14km dirt-road commute, and I use 32mm and 35mm wide tires.
Also, many tires have built in flat protection in the form of kevlar and other synthetic belts and sheilds under the tread. These work really well but the tires don't roll quite as well with them... they slow you down less than having to fix a flat, though. Also, the flat protection tires tend to be a little more expensive. A basic non-flt-resistant tire will usually cost $20 or so, flat resistsn $35 to $50.