Truck tires vs RV tires on a Class A

cbr46 wrote:
Tire Load Limits at various Cold Inflation Pressures
Bridgestone Truck 245/70R19.5

Pressure Listed is the Minimum for the Load
SINGLE
psi lb
70
75
80 - - 3525 - - 71%
85 - - 3750 - - 76%
90 - - 3860 - - 78%
95 - - 4080 - - 83%
100 - - 4300 - - 87%
105 - - 4410 - - 89%
110 - - 4540 - - 92%
115 - - 4805 - - 97%
120 - - 4940 - - 100%

If you had a tire rated for Speed Index J (62 mph) is there a way to (safely lol) exceed that speed by increasing tire pressure above actual load.

Example - Say there is 4,000 lbs on a wheel, which would call for 95 psi from the table above . . . . but that tire is only rated for 62 mph. Can the pressure be increased to 105 psi (arbitrarily picked) and gain another 10 mph without the tire flying apart?

BTW - Those Bridgestones from the table are rated for 75 mph.

Best,
- c bob

Look seriously at Continental HSR-1 tires. They are virtually identical to the Michelins for rubber consistency and side wall flex at about half the price. Also do not skimp on tire size. Buy the largest size that will fit and lower the air pressure to your load requirement. You will get the best ride that way.

x2 on rivering on fronts for G670's. Put Mich XZA2 Energy's on front and oh, so smooth. DW even noticed how soft the ride was on 120 psi. Still running G670s on read drive and tag for now, but getting close to aging out and most likely will go with mich's there too.

I replaced my XRV's with the truck tire equivalent and the ride is every bit as good if not better than the old tires.

I thought this was interesting . . . .

Tire Load Limits at various Cold Inflation Pressures
Bridgestone Truck 245/70R19.5

Pressure Listed is the Minimum for the Load
SINGLE
psi lb
70
75
80 - - 3525 - - 71%
85 - - 3750 - - 76%
90 - - 3860 - - 78%
95 - - 4080 - - 83%
100 - - 4300 - - 87%
105 - - 4410 - - 89%
110 - - 4540 - - 92%
115 - - 4805 - - 97%
120 - - 4940 - - 100%
125

If I only knew how much load/ wheel I had . . . Scale visit is on my list of things to do. Not really near any interstate scales. Anyone get this done at the county dump?

Best,
- c bob

The one thing I don't see mentioned is noise.....I put some Kelly tires on my DP and they made a lot of noise. Rode fine, just noisy. Sounded like the rear end was coming out of the rig.

I never had a blow out with the Michelins XRV, but right at five years they had cracks all over the side walls to make any person with common sense to change them out. The thing was that they were one month past the warranty and Michelin would not even pro-rate them even though the tread looked new.

So my point is that if they had UV additive to the rubber, it sure did not work on mine.

The ride on your coach is determined by what type of suspension you have on your coach. There are good and then there are some that will ride too stiff, does not matter what kind of tires you have.

Look at the tires on commercial buses and you will change your mind about using at least H rated tires.

Also! Have you ever seen the damage of a blow out?

Just saw you post. I did it many years ago. A friend at the tire shop said he could save me a bunch of money with truck tires. Yeah, sure, saved money, but the ride was so stiff if I drove over a dime I could call heads or tails. As luck would have it, before we could have a friendship problem my wife and I went to an RV show and saw a MH we "loved." Traded in the old MH, truck tires and all.
I wouldn't do it.
JMHO

NEW tires will ALWAYS feel better than old tires...Rubber hardens with age, especially if they're sitting for long periods of time. Same way when I worked for a large Ford dealer..when you brought your car in for service, ALWAYS move the seat back or forward. That way when the customer came to pick up his car, it FELT DIFFERENT, so we must have fixed it!....:B....Dennis

rgatijnet1 wrote:
The only companies that make tires that are specifically marketed as RV tires are Michelin and Goodyear. Both of these companies put extra compounds in their formula to resist UV damage to tires that just sit in the sun a lot. Other than that, I would suspect that truck and RV tires are close to identical.

You are right on the UV's, but Michelin claims there XRV Tire has a much softer rubber compound than there truck tires because RV's do more sitting. You can look it up on Michelins Website if you care too. And this was the main reason when I bought new Michelin tires last month I went with the XRV instead of XZE2+.