[Archived]

Jon: I must, most respectfully of course, disagree with you on this.

I have close to 300,000 Prevost miles. I could not tell the difference driving between solid axle vs. ifs or stock shock vs. Koni in a straight line BUT the difference in ride ON MY COACH going from 315’s @115psi to 365’s @90 psi was HUGE.

[AL]

This is my first experience with 365’s
vs 315’s and other than seeming to track down the interstate better,
I can’t tell much difference. My 315’s were at 105 psi and the 365’s
are at 100, so 5 lbs is nothing. There may be a little better ride,
but again, I can’t really tell. They look pretty awesome and there is
some occasional rub on the styrofoam in certain extreme wheel
positions. Get into a tight downhill hard turn like my driveway while
maneuvering and I get some minor rub and noise, even when pumped up.
The 315’s didn’t do any of that.

If I had a bus with 315’s and no weight
issue on the steer, I would not go to 365’s, but for heavy front ends
needing high tire pressure, the 365’s would be the solution.

[Archived]

Hey Tom, why are you only running 5 pounds less in the 365 than the 315. Seems like there should be more difference in tire pressure.

[Tom]

“I have close to 300,000 Prevost miles. I could not tell the difference driving between solid axle vs. ifs or stock shock vs. Koni in a straight line BUT the difference in ride ON MY COACH going from 315’s @115psi to 365’s @90 psi was HUGE.”

I can certainly agree if the 315 and 365 tires were both the same age. Truk and I spent hundreds of miles recently in my H2 Hummer with old tires. They were noisy and rode harsh. So bad we could hardly talk. I replaced them and three weeks later he rode in and drove my H2 again. The difference was HUGE.

[Fred]

Jon,

What weight is your coach running on the steering axle? I have been running 105psi on my 365s and am getting a fairly harsh slap on expansion joints, pot holes and other pavement irregularities.

Thanks,

[Fred]

Buddy,

My steer axle weight full of fuel, water and all our junk put’s me right between the 90/95 psi range on the Michelin 365 chart and I add 5 lbs, making it 100. The Royale being a 40′ and using 315’s called for 100 and I kept them at 105.

[needtocamp]

Alvie,

Without looking I am not sure of my front axle weight. I have a 2005 chassis and I am about 500 pounds below the limit. I do know the chart calls for 100 PSI and I am at 105.

Mine also make a fairly loud “slap” or noise when going across expansion joints, but I attributed that to the size of the tire and the “ringing” sound not unlike what you might expect if you bang on the inflated tire with a metal bar such as the truckers use to check inflation.

My seat of the pants ability to judge comparitive rides between tire sizes and pressures is sadly lacking and made more difficult trying to sort out differences associated with the respective noise levels when crossing expansion joints. I am not sure I could accurately separate all the factors that contribute to a driving comfort level because I am sure noise somehow makes us think of harshness. I think (but cannot verify) my 365s make a louder noise on bumps than the 315 which on both of their respective coaches were inflated to the same pressure due to the axle weights on each coach.