My 2012 ACE 29.1 came with Continental HSR 225/70/19.5. I keep PSI at the rated 85. There is easily 3/4 - 1" of space between the rear duals. These tires ride rough however and offer a lot of road noise and feedback.The 2013 29.2 came with Goodyear G670 RV 245/70/19.5. I keep the PSI in these at the recommended 82. These ride much nicer and quieter than the smaller conti's. But the spacing on these is much closer between the duals. Like closer to 1/4 to 1/2". Logic tells me this might be close enough for a rub at high temps and bouncing. That said we have taken it on long trips and I inspect them regularly and I can't see any evidence that they have ever rubbed. Am I being paranoid? Part of me wants to think Ford or Thor knew what they were doing when they spec'd the larger tires, but part of me also thinks I am being naive to put my faith in the RV industry for doing the right thing. Thor obviously would never openly admit to a dangerous dual gap. Am I being paranoid? I love the tires and so far no issues, but it seems awful close. I think I could buy spacers to ease my mind but if there is no real issue why bother. It's a light coach at only 16k#. Thoughts?

The problem is not the tires touching each other (should that happen) it is the lack of space for debris between the duals. Which could cause rocks and such to get wedged between the tires causing failure stay on paved clean roads and there should be no problem go off road boon-docking and I would keep a close eye on them.

Looking at the tire specs available online, the Continental tires were to go on a 6" rim and the Goodyear tires could go on a rim from 6.5"-7.5". If you have 6" rims, I would say no to the Goodyear tires. 1/4" to 1/2" seems like sufficient gap but that seems too close when you hit a bump and the coach is bouncing down the road. It is also so close that it may allow a piece of gravel, or other road debris to become wedged between the tires, which could quickly cause a sidewall failure. The dealer that installed the tires should have checked the specs regarding dual spacing.

rgatijnet1 wrote:Looking at the tire specs available online, the Continental tires were to go on a 6" rim and the Goodyear tires could go on a rim from 6.5"-7.5". If you have 6" rims, I would say no to the Goodyear tires. 1/4" to 1/2" seems like sufficient gap but that seems too close when you hit a bump and the coach is bouncing down the road. It is also so close that it may allow a piece of gravel, or other road debris to become wedged between the tires, which could quickly cause a sidewall failure. The dealer that installed the tires should have checked the specs regarding dual spacing.How do I tell the size of my rims?

Like rgatijnet1 said. The tire specs will tell you what width of rim the tires have to be on. The Conti 225/70/19.5 will fit a wheel width of 6.00" to 6.75". The GY 245/70R19.5 is spec'ed to fit a wheel width of 6.75" to 7.50". You can not put them on a different size wheel or you will have various problems. The proper air pressure using the manufacturers load / inflation charts will keep the dual tires from kissing each other.As SeaDog/BRR pointed out, one has to be very careful to not pick up any debris, such as rocks or chunks of wood, between the dual tires. Something like that can cause a blow out of both tires in less than ten miles. Why do I say "less that 10 miles"?? Because I have had it happen. Both tires ruined. In fact, I saw the rock and was going to get it before I pulled out. 10 minutes later, I pulled out without remembering that stupid rock. I was stupider than the rock, cause I should have taken care of that the minute I saw it.

On my coach, the width of the rim is stamped on the rim itself. Naturally this means removing the wheel cover to see it, which is a little hassle. You may be able to look at the factory specs for your coach to see what size rims were supplied on the standard coach.

Rear dual tire space - too close? | Good Sam Community

15 Replies

rgatijnet1
Explorer III
Oct 08, 2013
On my coach, the width of the rim is stamped on the rim itself. Naturally this means removing the wheel cover to see it, which is a little hassle. You may be able to look at the factory specs for your coach to see what size rims were supplied on the standard coach.
wny_pat1
Explorer
Oct 08, 2013
Like rgatijnet1 said. The tire specs will tell you what width of rim the tires have to be on. The Conti 225/70/19.5 will fit a wheel width of 6.00" to 6.75". The GY 245/70R19.5 is spec'ed to fit a wheel width of 6.75" to 7.50". You can not put them on a different size wheel or you will have various problems. The proper air pressure using the manufacturers load / inflation charts will keep the dual tires from kissing each other.

As SeaDog/BRR pointed out, one has to be very careful to not pick up any debris, such as rocks or chunks of wood, between the dual tires. Something like that can cause a blow out of both tires in less than ten miles. Why do I say "less that 10 miles"?? Because I have had it happen. Both tires ruined. In fact, I saw the rock and was going to get it before I pulled out. 10 minutes later, I pulled out without remembering that stupid rock. I was stupider than the rock, cause I should have taken care of that the minute I saw it.
Effy
Explorer II
Oct 08, 2013
rgatijnet1 wrote:
Looking at the tire specs available online, the Continental tires were to go on a 6" rim and the Goodyear tires could go on a rim from 6.5"-7.5". If you have 6" rims, I would say no to the Goodyear tires.
1/4" to 1/2" seems like sufficient gap but that seems too close when you hit a bump and the coach is bouncing down the road. It is also so close that it may allow a piece of gravel, or other road debris to become wedged between the tires, which could quickly cause a sidewall failure. The dealer that installed the tires should have checked the specs regarding dual spacing.

How do I tell the size of my rims?
rgatijnet1
Explorer III
Oct 08, 2013
Looking at the tire specs available online, the Continental tires were to go on a 6" rim and the Goodyear tires could go on a rim from 6.5"-7.5". If you have 6" rims, I would say no to the Goodyear tires.
1/4" to 1/2" seems like sufficient gap but that seems too close when you hit a bump and the coach is bouncing down the road. It is also so close that it may allow a piece of gravel, or other road debris to become wedged between the tires, which could quickly cause a sidewall failure. The dealer that installed the tires should have checked the specs regarding dual spacing.
SeaDog_BRR
Explorer
Oct 08, 2013
The problem is not the tires touching each other (should that happen) it is the lack of space for debris between the duals. Which could cause rocks and such to get wedged between the tires causing failure stay on paved clean roads and there should be no problem go off road boon-docking and I would keep a close eye on them.

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Rear dual tire space - too close?

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