If you do decide to use those, you will need the adaptor made by Cobra for those to work. The adaptor is here: http://www.philshobbyshop.com/tek9.a...ific=jqkrmpjng
These will let you bolt those WIDE tires right on, but I would only use that on the right rear. This is also the same adaptor that you would use to run a CAP tire.
If you are SERIOUS about going FAST, and end up going to an oval track that is banked, look into buying BSR cap tires for touring cars. They make them for 1/10 sedans. You will not find a better tire for grip. I would suggest using reds or greens on the inside and a pink on the right front and a red on the right rear. They are all the same width, which is a good thing for getting a consistant run. You might want to go with a blue on the right front too, but I would stick with the Pink, it is a better tire for grip and durability. just make sure that you go with the kavlar belted ones. The cap tires are good for concrete, not asphalt, IF YOU ARE RUNNING A FLAT TRACK, but if you get to go to a banked track, you would not want to run anything but the cap tires, weather it a asphalt or concrete.
Horizon does carry them, so any hobby shop can order them for you, but here is a link for information on them: http://www.bsr-racing.com/cap/touring.html
The web site doesn't have that much information, but it will soon.