The first thing you need to consider is how you will be using the cart. If you are just messing around and maybe not always staying on clean pavement, racing slicks are not a good choice.
Racing slicks are expensive and they get sticky when they get hot (when they are new). This is what makes them work so well in a racing situation. It’s just like NASCAR but only on a smaller setting.
Race tires have a very short service life. The carcass of the tire is very light weight and there isn’t much rubber compound on the tread surface. Race tires also are only good for a few heat cycles.
Once they have been heat cycled a few times or they get old, they begin to get hard. Hard tires have no grip so they can become like driving on ice.
So unless you have lots of money to spend on tires often, or you are racing on pavement, you probably want to stay away from a true “race” tire.
Decent tires are not cheap. You could go to Harbor Freight (Princess Auto) and buy a wheel with a tire for $10-$15. But these are mostly designed for wagons and hand trucks that are used at walking speeds. They won’t last as long as most race tires if you are having fun. So although the initial investment is cheap, in the long run you won’t have much fun for the money you spend.
Your best bet is to buy a decent go-kart tire that you should be able to get a couple years out of.
As far as wheels, Azusa has a lot of stuff to suit your needs. You just need to decide what you want and then select a bearing for the wheel you choose that will fit your spindles and axles.
These guys aren’t in Canada but maybe this will give you a better idea of whats available.
http://www.alliedmotorsports.us/id18.html
