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Old 03-20-2016, 09:27 PM   #1
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Tire Clearance

I'm still going over tire specs for a possible upgrade to a g rated tire. Now I've run into a potential problem. My existing tires roughly measure 30" diameter and the spacing between tires is an accurate 2.25". I was considering the Sailun 637, but they are 32" diameter tires, which eats up almost all available clearance. The Goodyear G614's are 31" tires, which would still leave me 1.25" of clearance. For you fellows with more experience with tire upgrades, Is that adequate? Any suggestions?

Thanks
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Old 03-20-2016, 09:44 PM   #2
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If you have Dexter axles the minimum distance between tires is 1".

With the proper rim (16x6.5") the GY G614 RST is 30.7" tall.

http://www.goodyearrvtires.com/tire-selector.aspx
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Old 03-20-2016, 10:48 PM   #3
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Thanks Airdale. I was on Simpletire's website looking at the Sailuns, and checked the G614's while I was there. They listed the G614 at 31". Not much difference I admit, but at this point, I'll take every 1/4" I can get.
And since I'll need new rims anyway, 6 1/2" rims would be used. Thanks for the info, that helps a lot.
I also want to put some effort into measuring the exact diameter of my existing tires. That will be one of tomorrow's chores.
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Old 03-21-2016, 03:11 AM   #4
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This is exactly why I opted for 17.5" rims and lower profile tires. I went up a couple of load ranges and carrying capacity. I decreased my overall tire diameter + thusly increased my spacing between the tires.
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Old 03-21-2016, 06:27 AM   #5
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Originally Posted by ependydad View Post
I decreased my overall tire diameter + thusly increased my spacing between the tires.

How much did it lower the trailer?
Maybe THATS why you tore your jacks off..


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Old 03-21-2016, 06:51 AM   #6
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Originally Posted by Davidg View Post
Thanks Airdale. I was on Simpletire's website looking at the Sailuns, and checked the G614's while I was there. They listed the G614 at 31". Not much difference I admit, but at this point, I'll take every 1/4" I can get.
And since I'll need new rims anyway, 6 1/2" rims would be used. Thanks for the info, that helps a lot.
I also want to put some effort into measuring the exact diameter of my existing tires. That will be one of tomorrow's chores.
That sounds like a lot of money to change out of your pockets. will that also change the height to the finder well? Good luck with your choice, hope it works out for you...
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Old 03-21-2016, 10:04 AM   #7
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How much did it lower the trailer?
Maybe THATS why you tore your jacks off..

I think these tires were 1/2" smaller in diameter than what I took off. So the lowering was not noticeable. And short of that monster truck + RV combo- that parking lot exit was going to eat my stabilizers.
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Old 03-21-2016, 10:27 AM   #8
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That sounds like a lot of money to change out of your pockets. will that also change the height to the finder well? Good luck with your choice, hope it works out for you...
You are correct. It IS a lot of money. Around $1800 (wheels and tires) to be exact, and that grinds my gears as well, but, changing out chinabombs on the side of the highway over and over and buying replacement tires when you're at the mercy of billybobs tire shop is also not desirable. There is plenty of clearance in the fender wells.

This is one of the glaring examples of poor quality FR uses in their coaches. I know the Silverback isn't a Mobile Suites, but it's not a popup either, yet, it came with popup quality tires. I did a little research on the tires that came on my coach, and they can be ordered for $74 each. I would wager that FR pays less than $60 per. Guess where these tires are made? Constancy 188's are just about the crappiest tires you can buy. Now, having said that, they are still rolling. We have around 2000 miles on them now with no problems and they were built in 2014. They spent their first year sitting on a dealers parking lot south of Houston where the sun can be intense most of the year.
My biggest fear is that one of these cheap tires might blow at 60 mph beneath the refer and rip out propane tubing and electrical, plus destroying the left side fender well along with the slide components. This at a cost far exceeding the cost of better tires.
Yes, I have insurance, but I've heard so many stories of shops being unable to repair these coaches in a way that restores them to "as new". Plus the coach ends up sitting on some repair shops yard for weeks or months waiting on parts.
So, having weighed out all the pros and cons of doing nothing, just replacing tires with Maxxis 8008's,(still a good option) or replacing wheels and G614 tires together, I keep leaning to the G614's just for the reliability and peace of mind. It's sort of like buying a single premium insurance policy. I realize there are no guarantees, and even the 614's will need replacing eventually, but it's still a good option. Yet the Maxxis tires seem to have a good reputation as well....so I'm still considering options.

Ependy, can I even get 17.5", 6 lug wheels? I think I checked on that, but I recall that 17.5" wheels are not available for 6000 lb axles. I really don't want to change axles too. That would drive costs up in the $3000 range.
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Old 03-21-2016, 10:40 AM   #9
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The cost per tire mounted on a rim is likely a lot lower than $60.00 Probably closer to $25 - $35 each.
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Old 03-21-2016, 10:46 AM   #10
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I think these tires were 1/2" smaller in diameter than what I took off. So the lowering was not noticeable. And short of that monster truck + RV combo- that parking lot exit was going to eat my stabilizers.
But we made that parking lot exit regurgitate the stabilizers and brought them back to life.
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