Load range E--ST Tire
Just bought my first RV. It's used with 2yr old tires. I'm planning a long trip and all the talk about the tires is confusing. My travel trailer is 28ft with dry weight of 6000 lbs. The tires say ma...
Forum Discussion
Bob2952 wrote:
Not sure how I put this in Class A motor homes? My first post.
Appreciate all the info. To modify my question (my travel trailer is 6000lbs dry. With added cargo 2000lbs it has max weight 8000lbs) my tires are ST225/75R15 load range E speed rating 75mph. Load 2830lbs single/2470lbs dual.
If I put 70-80 psi in my tires and average 60mph am I good to go 1000 miles?
OK, doing the math:
If 4 tires are 8000#, then 1 tire is 2000#, but if we account for front to rear and side to side variation (12%) we get 2240#. An ST225/75R15 Load Range E has a load carrying capacity of 2830# at 80 psi and at 70 psi, 2620#, so at 70 psi, the reserve capacity is 17%.
That sounds good to me. But here's a way to check it. It's called Pressure Buildup.
Measure the pressure and the ambient temperature right before you start out.
An hour later check the pressures and temp again!
You don't want any more than a 10% buildup excluding ambient temperature effects (2% for every 10°F)
