if you need it to fit under the fender that's not going to be a very wide tire. I would say your only going to be able to have about a 8" tire so a 5" rim would work. Why does it need to fit under the fender? If your worried about safety inspection that's one of the tings no one cares about with buggies.
Actually its the rear that I am more concerned about. I am looking at a set that has 2 15x4 and 2 15x12. I am concerned the 15x12 will be to wide for the rears.
12" is way to wide if you are concerned about rear fender coverage. I run an 8.5 centerline and mine stick out what could be an inch. What type of backspacing do they have? Check out this thread. http://www.meyersmanx.com/forums/showth ... =tire+size or do a search on rear tire sizes, there is plenty of info in the archives.
I am getting my tires in today and I will be mounting them Sat. I have 6's for the front and 10's for the rear. I will post pics on here once I get them on my buggy. Jeremy Chatanooga, TN
The amount the tires stick out of the fenders will also depend on the axles being used. There are short swingaxles, long swingaxles and IRS. I'm running short awing axles in my Manx. The long swing axles and the IRS axles are the same width.