thanks that's the answer i have been waiting forMy 1970 trail rite trailer for my Venture 17 came with F78x14 tires, today you will find the 205/70 should be a close replacement and easily found. I'm not sure that there is enough clearance under the fenders for a 15 inch wheel. I have a 5 lug wheel and it is pretty standard, you can just measure this before you order the wheels.