Tires: horse trailer tyres, passenger car tire, trailer tyres

Question
i bought a 2nd hand horse trailer it currently has 6.70-15 tyres on it i have asked and asked but no one seems to have a clue about what tyres i need.
i read a conversion chart that states my size are vintage tyres and the todays equivalant would be P215/70R15 8ply is this correct as i dont want to buy tyres that dont fit and i cant contact the maker of the trailer as have no idea of the model please help :)

Answer
Lea76,

Are there other markings on the tire - like the letters "ST" or the letters "LT" before or after the size?  Does the tire have loading and inflation information?  Does it have "Ply Rating" or "Load Range"?  Ply Rating will be look like this:  8 PR - where the number will be an even number.  It might even say "Ply Rating.  Load Range will be a letter.

My web site has a conversion for passenger car type tires and includes 6.70-15.

 http://www.barrystiretech.com/vintagetireexchange.html

If the tire in question is a passenger car tire, then the closest match is a P195/75R15 which is supposed to go on a wider rim than a 6.70-15.

However, there is also a 6.70-15LT that is a LT type tire and it has different loading and inflation limitations.

Please look at the tire carefully and post back what it says.