Originally Posted by Ditchooker
the Hercules I am running are an ST tire, but are marked with an "L" speed rating (75 mph)
Good to know that Hercules has established a Speed Rating for their trailer tires. I note that they have some trailer tires with higher load capability than some others.
The default on ST tires that do not have a Speed Rating from the tire manufacturer is still 65, lacking something in writing, from the mfg or molded on the tire sidewall from the tire.
I write a blog on RV tire application and safety. RVTireSafety.com
Also give seminars on tires at RV events across the US. 40 years experience as tire design & quality engineer for major tire mfg. Freelander 23QB on Chevy chassis is my RV