The Parma Violets are a multi compound tire like Kevin stated. 40 on the outside and 35 on the inside. I have not seen this tires in person, so I can not tell you how wide each strip is.
The CRC and Speedmerchant cars are pretty close to the same. Small changes between the cars. I like the CRC as you don't have to tape in batteries and it comes with the new front end. Also the cross barace is alot stiffer as the posts are on the outside of the car. That can also be the downfall as the chassis is wider. Bruce at Speedmerchant is one of the coolest guys there is though. Will always help out anyone. The CRC cars do seem to be on a roll lately though.