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-   -   Need Tire info / from Toyo to Goodyear G670 (https://www.irv2.com/forums/f104/need-tire-info-from-toyo-to-goodyear-g670-52264.html)

2racer 05-16-2009 07:58 AM

Need Tire info / from Toyo to Goodyear G670
 
We are looking to change tires from the Toyo 295/75/22.5 to the suggested Goodyear G670. Our local tire store is telling us that we must change all 6, due to 3.5" difference in height. The tire store wanted to put us in a G395 instead, but it sounds like the G670 would be better.
Have any of you done this and happen to know the size to go to on the G670 RV Tire? Also, price? I was quoted 3100. for all 6 G670's, does this sound about right?

dgerstel 05-16-2009 08:24 AM

Heath,

Do a search for tires or Goodyear, lots of information already here. I have heard that Pete's Road Service in Calif has some of the best prices.

jerry davis 05-16-2009 02:25 PM

We just returned from Oregon where we had our original Toyo 11R22.5 tires replaced with the G670 295/80 22.5's from Goodyear. We paid $3400.00 including mounting, balancing etc.

I could not tell any difference in the speedometer or tach even though I was expecting some changes. The ride is better, probably because I am running less air pressure (105 front,97 rear). We purchased the tires from Les Schwab in Bend. We tried many places in Northern California but everyone was at $3500.00 or more.......these are pricy tires.

With about 1000 miles on the six tires I am very satisfied even though it took a chunk out of my big sweaty wad of RV money. I feel much more comfortable with the old Toyo's retired before the blew.

takepride 05-16-2009 04:57 PM

2R:

We changed from Toyo 295/75R22.5 to Goodyear RV670 295/80R22.5, for $473.28 each, plus tax, mounting, balance, stems, recycle fee, etc., $3599.09 total, at Pete's Road Service. If you found someone in FL with the same price, I'd guess you found a good source. I had other bids as much as $700 more, from reputable dealers mentioned on this forum.

I added Koni's at the same time, so I cannot tell you which improved the ride and reduced the noise most, but it's great now.

The only difference I've noted negatively is that if I crank the wheel fully to one side, it rubs on some loose wheel-well trim that I need to reinstall.

SteveS 05-16-2009 09:11 PM

2racer - The Goodyear G670rv tire size you want to match your Toyos is 275/80-r22.5 (not 295/80-r22.5). The reason the tire guy told you to change all of them is because of the difference in diameter. Even then, I believe he made a mistake because the diameter difference should be just over an inch, not three inches. This is the Goodyear equivalent to the Toyo M154 295/75-r22.5. If you are just changing the front tires there will be no problem. If you are changing the rear, change both tires on a side together.

takepride 05-17-2009 12:08 AM

Steve:

Are you telling me that Goodyear gave me the wrong tires? Yikes!

Four CA dealers (and Les Schwab in OR) that were quoting GY prices to me were given the Toyo size as 295/75R22.5 and each said to use the G670RV 295/80R22.5 to replace. One mentioned that a slight speedometer variance would occur, but only 2-3 mph at speed.

Is the 275 a better fit?

Old Scout 05-17-2009 07:06 AM

2r==We swapped out our old Toyo 295 R75s on our 2003 with the G670s. In between, we had put G395s steer tires on the front to overcome an acute alignment /wear problem. Too late we discovered the 395s are only "G" load rated. We also went with the Koni shocks--overall, we are very happy with the set-up. However, there are some minor differences between the Toyo 295 R75s and the G670s. Due to what I assume is a slightly higher profile/larger diameter, our speedometer is about three miles slow and accordingly, the odometer is also off/short. Havent noticed any change in engine power/torque but the tach is reading about 100 RPMs less at the "equivalent" MPH. I ve heard the larger diameter can be accounted for by Cummins in the Engine mgt system but I havent followed up on it. Lots of comments and opinions on the forum--if second-guessing is yr thing then this is where to do it. However, I think you picked good tires and got them at a fair price.

Jim&MaryJo 05-17-2009 09:38 AM

Lots of different viewpoints here.
Did WRV change tire brands and sizes through the model years?

Pete's Road service recommended G670 in 295/80 for me.

Here's the load/dimensional specs for different sizes:
https://www.goodyear.com/rv/products/g670.html

And, here's the load inflation tables:
https://www.goodyear.com/rv/pdf/rv_inflation.pdf
Note the significant difference in PSI/load between the 295/75 and 295/80.

The 295/80 has a much higher max load (although both are H range) and is specified to run with lower PSI against the same load, compared to the 295/75 and especially against my former Toyos.

I noticed ~2% percent change in speedo error, compared to Toyos. I also noticed a better ride.

I'm no tire expert, but the 295/80's taller profile doesn't seem to be a problem. Its wider stance seems desireable. And its ability to carry the same load at lower PSI seems like a good thing, perhaps implying this tire is heavier duty.

:confused:

EngineerMike 05-17-2009 11:40 AM

If your mileage/speed is off, you can have it corrected by anyone w/Cummins scantool software (called Insite and takes a proprietary pigtail to hook up to a doagnostic port @ front or back of coach). Mike Young of Cummins-Yakima fame called it changing the "revs." I think that's a measured circumference on your drive tires, or the distance travelled by one revolution of the tire.

jerry davis 05-17-2009 01:28 PM

Just about everybody we talked to recommended the G670 295/80 as the best replacement for the original Toyo's. As I stated earlier, there was virtually no change in my rpm to speedo reading, maybe one mph. Certainly not enough for me to worry about getting a recalibration.

SteveS 05-17-2009 02:51 PM

Takepride - I was addressing the best fit for the original Toyos using the G670s. Below are the specs to the tires. Notice the diameter of the G670 295/80 is a little over an inch greater. The G670 tire dimensions of the 275/80 closely matches the Toyos. If all 6 tires are being replaced...no problem. If two on the rear or the front are being replaced, you should try to match dimensions. Of course, this assumes load ratings are equivalent. The difference in circumference between the Toyo and G670 295/80 will cause a 2.2% error in odometer and speedometer readings while the G670 275/80 will cause an error of 0.5%.

https://toyotires.com/tire/pattern/m154

https://www.goodyear.com/rv/products/g670.html

jerry davis 05-17-2009 03:59 PM

When we had the new tires installed at Les Schwab in Oregon the dealer installed a bag of Equal in each tire instead of spin balancing. I was not familiar with this method of balancing but was informed that this is Les Schwab's main method of balancing large RV tires. I was pleasantly surprised at the results. Very smooth feel.

Anyone else used this method with new tires?

Old Scout 05-17-2009 09:54 PM

Jerry--just to clarify,,,WRV moved from the Toyo 295 R75 to the Toyo 120s [or something like that [120s compare to the 22.5 or R80 profiles]] sometime in 2004 or 2005. Accordingly, if you swapped out the Toyos on yr 2005 with G670s, you probably didnt see much difference as they are about the same. Anyone who swapped/ swapping the old Toyo 295 R75s for the G670s will see a slight change in MPH, miles, and RPMs.

Jim&MaryJo 05-18-2009 08:26 AM

I had the M120Zs on my 04.
They had a 2002 DOT date stamp.


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