New tires

[ryoungb]

Hello,

We have a 2004, 36', fsds Alpine coach, 30,000 miles. It's time to re-tire. It came with Toyo's, but I'm hearing not good things about them. Any better recommendations?

Thanks,

ryoungb@attglobal.net

[takepride]

ryoungb:

Look at this thread (now just above yours):

http://www.irv2.com/forums/f104/need...670-52264.html

It is one of many (ad nauseum) discussions on tires.

And WELCOME to the Alpine Forum, enjoy looking around. You might change your "signature" to include your year and model so you don't have to write it each time and so we can better guesstimate solutions, ideas and suggestions. Maybe add your location, too, so as to direct you to vendors.

You can also join the "Alpine Owners Club" to show your membership below your avatar.

Also check out (and join) the Alpine Coach Association for all things Alpine, including a technical library, rallies and lots of Alpine info. http://www.alpinecoachassociation.com/

[mythplaced]

I just bit the bullitt and bought the 670 Goodyears.....

Mounted , balanced & taxes with rebate came just short of $2.8K ....

[jerry davis]

I also just installed the G670 295/80/22.5 Goodyears. Same price after rebate.......$2900. They seem to have a very good ride and I feel more confident with them then the Toyo's.

[Rick Coleman]

What tire pressures were recommended?

[jerry davis]

110 front, 95 rear

[mythplaced]

Originally Posted by Rick Coleman

What tire pressures were recommended?

The guys at "Wingfoot" believe in safety as you leave the facility and aired all my tires to the MAX 125psi..... That would equate to a loaded weight of 43420!

The RV rode and drove TERRIBLE! wandered all over the road, felt every bump and lump......

At our weight ( 31000 max) the pressures are...
90 front
80 rear

NOW it drives like an Alpine!

[takepride]

Mythplaced:

You might consider just a few extra pounds. WRV posted the recommended amounts on their placard. Mine is 100 and 95. I know the tire charts read a little lower, for your weight, but if they are too soft they "bruise" more easily and that bruise becomes a weak spot down the road (pun intended).

Even if your load rating increased, the posted amount will correspond to the same recommended pressure, even across brands.

Via phone, Les Schwab told me 120 and 110. My dealer (Pete's) said the posted was fine, more was just security at the cost of a harder ride.

[Cinequip]

2009 WRV placard also says 120 and 110 with factory installed G670's.

[mythplaced]

WRV had to take every load range tire you could possibly buy into consideration....Not just the OEM 670's, and they must consider that you might not actually weigh your coach.....

Direct from Goodyear on 670's

Importance Of Proper Tire Inflation.

Improper inflation can cause issues and stress for the tire. Underinflation can cause poor handling, fast and/or irregular wear, decreased fuel economy or even disablement. Overinflation can reduce traction, braking ability and handling, as well as result in uneven wear and a harsh ride.

How Much Air Should Be In Your RV’s Goodyear Tires.
....... The proper air inflation for your RV’s Goodyear tires depends on how much your fully loaded RV or trailer weighs. .......Now that you’ve weighed your RV or trailer, look at the manufacturer’s load and inflation tables to help determine the correct tire inflation pressure for your vehicle’s loading.

Here is the "MEAT"
If you haven’t weighed your RV by wheel position, you should use the recommended inflation pressures found on the vehicle’s certification label or in your vehicle owner’s manual.

http://www.goodyear.com/rv/pdf/rv_inflation.pdf

295/80R22.5 75
PSI 80 85 90 95 100 105 110 115 120 125

S 5480 5750 6020 6285 6550 6810 7070 7320 7580 7830(H)

D 4855 5100 5335 5570 5805 6035 6265 6490 6720 6940(H)

http://www.goodyear.com/rv/pdf/rvbrochure.pdf

[Cinequip]

My coach weight with full fuel, low fresh water and empty waste tanks, stocked for a trip with us in it:

12,500 front axle
19,700 rear axle

By the table above, we should have 95 in the front and 85 in the back for 290/80R22.5 G670's with 2400 miles and 1.5 years old.

My question: That pressure seems low, should I add another 5-10# to account for unbalanced load distribution (I didn't weight on each tire independently), accuracy of guage, actual "cold" temperture, varying load due to cornering-wind load sway, varying elevation and so forth?

Prior to weighing the coach, I was running 115 front and 110 rear. I'll sacrafice a little more harsh ride, for possibility of under inflation.

Thoughts, please.

[Flagelpater]

I am not an expert, however, the tires are part of the suspension system. The tires ability to absorb shocks is taken into consideration for the design of the coach. It would seem that carrying too much pressure would reduce the amount of shock absorption and maybe cause premature wear on the other suspension parts.

Also, the tire chart that I have does not include as a variable; Temp, Altitude, etc. It simply states COLD. Do to the fact that vehicles can obviously drastically change the operating environment during the day this must be taken into consideration in the construction of the chart.

I set my tire pressure right at the chart value. I have weighed the 4 corners. Maybe we have an expert here that can chime in for us?

[mythplaced]

Originally Posted by Cinequip

My coach weight with full fuel, low fresh water and empty waste tanks, stocked for a trip with us in it:

12,500 front axle
19,700 rear axle

By the table above, we should have 95 in the front and 85 in the back for 290/80R22.5 G670's with 2400 miles and 1.5 years old.

My question: That pressure seems low, should I add another 5-10# to account for unbalanced load distribution (I didn't weight on each tire independently), accuracy of guage, actual "cold" temperture, varying load due to cornering-wind load sway, varying elevation and so forth?

Prior to weighing the coach, I was running 115 front and 110 rear. I'll sacrafice a little more harsh ride, for possibility of under inflation.

Thoughts, please.

I went with 105/95 as I too believe in the margin of error..