Originally Posted by skip
From reading some of the older threads on tires, there seems to be some question @ putting radials on the older rims. Will the goodyear marathons be safe on my older, stock wheels ??
Okay, a quick rundown:
ST= Special Trailer
225=size of tire (metric)
75= aspect ratio-this is a percent of width to height
There seems to be differing opinions over whether or not to install radials on rims that were not specifically engineered for them. I have radials on my '72, load range C, but that is what came on it new. If your wheels are not intended for radials, there will be a notice stamped on them near the bead, saying something like, "not for use with radial tires" or a similar message.
There also is the potential for a problem installing load range D tires on rims that had load range C tires on them for an extended period. The heavier-duty tires can cause the rim to separate with potentially disastrous results.
If the tires you have on your coach now are D's, this would not apply to you. Anything else you may want to know about tires can be found by doing a forum search on tires. There are extensive threads and posts on the subject.