It sounds like he was willing to go shorter because he found a set of used tires really cheapI started with the ORP Falkens in the /65/. Why do you want to go shorter? Just the price? Might be a good deal for the money. Rethink the tire pressure if they are a different load range. There may be a few more "C" range tires in that size, if you want to drop down for a better ride.