why this car have smalls in rear?

http://www.maverickman.com/TireandWheelSizes.html

 

I am running 215/60 and 255/60 on 15s all around. Check out my photos and see if you want more or less than that.

I may go up to 225/60 on the next set of front tires. Going to stick with 255/60 out back.

 

That might not work out so well. The race car with 10 inch wide tires all the way around had its fenders notched out

 

It looks to me like the rear might be up a little bit to alow for larger tires for the track( roll bars seen with door open) And that, along with the angle the picture was taken give the ilusion that the rear tire is smaller.

 

There is no roll bar in this car that I can tell.
I say that this is the look the car has when you put the same size tires on all 4 corners. May have a slight rake to it by the way it sits.

 

Nope no roll bar at all, when you go to that link you see a different car next to it with a roll bar so that is probably where he is getting his info from.