i have a set of speed hawg tires ( http://www2.towerhobbies.com/cgi-bin...&I=LXDU17&P=ML ) that i have not yet used they look like they will grip ok but the road hawg tires ( http://www2.towerhobbies.com/cgi-bin...&I=LXDU17&P=ML ) look like they grip a lot better, i only got the speed hawg tires because i found a set of 4 on ebay for a really good deal.... foam tires will grip a lot better if it is dry but you mentioned using onraod tires when its wet out and the foam tires will get all soggy and wont perform well, so for wet on road running i think your best bet is to go with some rubber tires