Hmm.. Urban Assault eh? If you mean Trials and Urban Freeride, get some Atom Labs Trail Pimps.. The Sun Mag 30 is not too bad, just make sure that your pressure is up, and the spokes are tensioned...

If you mean Riding on the road, get some Tioga City Slickers.. why, well they're 2.1 slicks.. so you're not stuck if you try and hop anything with a rim bending 1.25 tire.

Joe