Originally Posted by
MTBerJim
I'm a mountain biker, the whole road bike tire thing is a mystery to me, is 700 and 700c 2 different things?
In general, no.
99.99% of the time, 700 means 700C (note that it's a capital "C"). For a couple years, GT offered a "700D" tire, which is now nonexistent:
http://www.sheldonbrown.com/harris/tires/587.html
Read the Sheldon Brown page. Even though he's been gone for several years, the information is still quite relevant.
You're a mountain biker? Don't even get me started on the 6 different sizes of "twenty-six inch" bike tires.