Trailer weight range
Senior Member
Joined: Jul 2008
Posts: 334
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From: Meriden, Ct.
Certainly not with the family aboard while towing a 33' trailer with tires that have a max speed rating of 65mph..
Senior Member
Joined: Nov 2012
Posts: 212
Likes: 0
Did you know that tires have a maximum speed rating? They do. This isn’t a big deal for passenger, light truck and motorhome tires because they usually have a MPH rating well above typical highway speed limits.
But nearly all Special Trailer (ST) tires used on all but the larget RV travel trailers and fifth wheels have a maximum speed rating of just 65 MPH.
You can drive faster than 65 MPH but in order to do that, however, you need to increase your cold inflation by about 10 psi (without exceeding the maximum PSI stamped on the tire) for every 10 mph over 65 that you are going, as well as decrease your load carrying capacity by 10%.
So, for example, a Carlisle ST225/75RR15 Load range E (10 ply) tire, has a load carrying capacity of 2830 lbs at 80 psi. But you will have a load carrying capacity of 2,547 lbs at 75 mph.
If you’re maxing out the load rating of your trailer’s tires it’s imperative that you keep your speed at or below 65 MPH. Driving faster will, at the least, shorten the life of the tires and may result in tire failure in the road.
What I’d like to have, and would be willing to pay for, is the full 2830 lbs load carrying capacity of the LRE tires and be able to drive at a more reasonable speed. Tire manufacturers should realize that RVers aren’t pulling 1960′s travel trailers anymore.
That is from one of the RV websites there are many more that all say pretty much the same thing. Here is a simple test if you check your tire psi hot after a long run it will tell you what the cold inflation should be if it's above side wall max your over loaded. The answer is the same no matter what speed you drive at.
But nearly all Special Trailer (ST) tires used on all but the larget RV travel trailers and fifth wheels have a maximum speed rating of just 65 MPH.
You can drive faster than 65 MPH but in order to do that, however, you need to increase your cold inflation by about 10 psi (without exceeding the maximum PSI stamped on the tire) for every 10 mph over 65 that you are going, as well as decrease your load carrying capacity by 10%.
So, for example, a Carlisle ST225/75RR15 Load range E (10 ply) tire, has a load carrying capacity of 2830 lbs at 80 psi. But you will have a load carrying capacity of 2,547 lbs at 75 mph.
If you’re maxing out the load rating of your trailer’s tires it’s imperative that you keep your speed at or below 65 MPH. Driving faster will, at the least, shorten the life of the tires and may result in tire failure in the road.
What I’d like to have, and would be willing to pay for, is the full 2830 lbs load carrying capacity of the LRE tires and be able to drive at a more reasonable speed. Tire manufacturers should realize that RVers aren’t pulling 1960′s travel trailers anymore.
That is from one of the RV websites there are many more that all say pretty much the same thing. Here is a simple test if you check your tire psi hot after a long run it will tell you what the cold inflation should be if it's above side wall max your over loaded. The answer is the same no matter what speed you drive at.