I'm trying to find a company who sells (and ships to Canada) a set of solid rubber tires. I'm racing a Dirtsurfer which uses a standard 20" double walled deep-v rim. I'd like to add more weight to my wheels by switching from a regular tire to a solid rubber one. I'm looking for something that can match the stifness of a tire rated for at least 110lb (7.5 bar) with a tread pattern as smooth as possible, slicks ideally.
