Blew a rear tire riding in St Clair today and couldn`t get it replaced or repaired (hole in sidewall). So the dillema I am having is to replace just 1 or buy 2 RaZr2`s?? I believe they will fit onto the stock rims is that true?? Are they 6 ply tires?? Are the stock Dunlops 6 ply??? Are they hard to change at home with simple shop tools??? Thanks for the help.