1515 E. Ajo Way – Tucson, AZ – 520-623-5766 – Website
4/19/18: Baby’s Getting New Shoes! When I was staying in Tucson, this was the most convenient location for me when it came time to have new Goodyear G670 RV tires installed on my motorhome. In this case, convenience also came with exceptional service, always a great combination.
If this review reads like “RV Tires for Dummies” that’s because I knew some of this info before today, but I also learned a lot of new basic things that will be useful to me. The guys here explained everything in easy to understand terms and I’ll share here in a non-techy way with pictures to illustrate, too. I know I’m not the only one who basically has to see a picture of it before me to really understand it, so I hope that’s helpful to my readers, also.
Goodyear Tire Guide Glossary: The D.O.T. number is a code that one can find on the sidewall signifying the fact that the tire complies with the U.S. Department of Transportation motor vehicle safety standards. The code identifies the manufacturer, manufacturing plant, tire size, tire type and the week and year of manufacture.
In my case, these tires were manufactured in the 20th week of 2017 (May 14-20), making them a little less than a year old at this point. Mark told me this is not unusual since specialty tires like this are manufactured in batches based on sales projections for the next year. Here’s a handy Week Number Calculator to find yours.
I told Mark I wanted to be able to more easily check the interior tire pressures, so I wanted valve extensions. I am going to install an EEZ Tire Pressure and Temperature Monitoring System and that seemed like the best solution for those, also. Mark told me he’d do whatever I wanted, but asked if he could explain why that might not be the best solution. I was definitely interested, so I took a little video to share (2:43 min. YouTube video):
So by parking with the exterior tire stem directly at the bottom, it’s easy to see the rear tire stem by looking under like this. Or you can use one of the tools that Mark demonstrated to easily check the pressure through the exterior tire holes.
We checked to make sure the tire pressure monitoring valve would fit with no problem. I’m looking forward to installing these, which will be my next project and review.
I remembered that the only trouble I had with my first set of Goodyear tires on my previous motorhome was due to a valve stem leak, so I’m glad to be able to do without them, even if it’s a little easier to check pressure with them.
With the tires off, checking the condition of the brakes was easy. I was happy to hear at 3/4″ on the brake pads, they were still in almost new condition (with about 14,600 miles on them). I’d never seen the “guts” of this area before and a friend likened it to looking up her skirt when I posted it to Facebook. 🙂
Mark explained that here David is manually torquing all the lug nuts to make sure of exact torque spec for each lug nut. It may be easier and faster to put on with an impact wrench, but then you’re not sure of torque being applied. That runs risk of being under or over torqued. They recommend that I check the torque again at about 100 miles just to be extra safe. Any Purcell location will do this for me for free. Like I said, I’m learning a lot!
The next thing we talked about was proper inflation of the tires, the most important thing to check before every trip.
The week before, I took the motorhome to a Pilot station with a CAT scale to get weighed. This is the best way to determine your own pressure. It’s an easy and inexpensive ($11) process and weighs the front (steer) and rear (drive) axles separately.
I decided to check it based on the heaviest weight scenario. So I had my fresh water tank (88 gallons) pretty much full and that alone weighs about 700 pounds. Although I rarely travel long distances with that tank completely full, I do sometimes when I know I’m going to be boondocking.
David, the tech who installed my tires, showed how to take these figures and relate them to the Tire Load Limits chart contained in Goodyear’s Tire Inflation Guide (full pdf document).
So, looking at my tire size, following over to the steer axle weight (divided by two since it’s distributed among 2 tires), you come up with 3,430. That gives maximum tire pressure of 90 psi in my case. The same formula works for the rear tires (15,500 divided by 4 tires) = 3,875 lbs.
So I left there satisfied with all tires inflated to 90 psi.
However, once on the highway, I definitely noticed it was a little bit of a harder ride. I had been used to running 85 psi all around based on other recommendations last time I was weighed. I called Purcell’s and spoke to Ernie, who said lowering the front tires to 85 would be okay and that might soften the ride a bit, but to go no lower than that. And keep the back tires at 90 psi since the heaviest weight is back there with the water tanks. So I’m going to try that when I leave here for the first 100 miles when I’ll stop at another Purcell down the road. I have reviewed Goodyear’s Recreational Vehicle Tire and Care Guide and intend to take really good care of baby’s new shoes!
And speaking of the road, I’m totally excited that I’m one major step closer to Departure Day for my Summer of 2018 in Colorado. So please hop on over there and tell me all about your secret favorite places that I shouldn’t miss!
My review of Goodyear RV Tires – I’m going to be updating this page soon with new information, and again thanking Goodyear for sponsoring me by providing these tires.
Transparency: As outlined on my About This Site page, I do sometimes barter for the time it takes to do these kind of extensive reviews. This Purcell location did this install at no charge and took the time to answer all my questions, interview and answered my subsequent extensive questions. I trust my readers know I will always be completely honest in my reviews and my opinion can never be bought at any price.