Quote Originally Posted by colorisnt View Post
... pea gravel ... trail ... pretty rough ... rain... wet concrete. I could walk them, but I was wondering if a new tire could help that?
What's the widest tire your bike will fit? Alternate question: What brake calipers does the bike have?

I'd suggest getting wider tires - they should help in all your sitations. A safe choice would be 700x25c. If there's clearance, 700x28c might be even better.

Bigger tires would let you run lower pressure which will absorb bumps better and might increase the contact patch. They'll also might roll over the pea gravel instead of "through" it.