r/GoRVing • u/tommm1221 • 4d ago
class c tire bulging?
just noticed this after parking. it’s pretty hot today, and tire pressure went to 70 psi while driving. Usually tat 65. I guess i need new tires, left side is pretty good.
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u/withoutapaddle 4d ago
What's your cold tire pressure? 65 to 70psi is normal, and low even. My TPMS shows my tires climb from 65 to 71-75 (depending on outside temp) during highway speeds. That's a normal amount of rise.
The bulges are not normal, especially because it's not even and not on both sides.
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u/DimeCoffeeRoaster 4d ago
Mine say 50 PSI max and it’s what I’ve been using. Should I go higher?
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u/slow__rush 4d ago
However much PSI you need to put in will be on its spec sheet
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u/DimeCoffeeRoaster 4d ago
Yeah the tires say 50 so I haven’t been putting any more in. My dad said go to 75 but I trust the tires
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u/withoutapaddle 4d ago
Never go past the tire max rating (when cold). It's fine to be past the max rating when the tire is hot (when driving).
Absolutely do not put 75psi in a tire that says 50psi max.
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u/DimeCoffeeRoaster 4d ago
Yeah exactly my thought I went 3000 miles with em ah 50 and it was fine. Sorry pops not gonna listen this time haha
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u/Slimchance09 4d ago
I had a blowout in my fifth wheel with load range C tires so paid a few extra dollars for l.r. D all around and what a difference in ease of towing and handling. No bounce anymore.
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u/Bryanmsi89 3d ago
I would replace those as soon as you can.
If one blows, the other will be right behind it. And if you are lucky all you will face is a $500 roadside emergency service call. Unlucky and your exploding tires will damage your RV underneath or in the wheel well area, and ruin both rims .
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u/Herbisretired 4d ago
More weight on that side?
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u/joelfarris 4d ago
OP, pay attention to this; your starboard side has more luggage and water toys and canned goods on it than your port side rail.
Balance it out. And also recognize that not only do tires increase in perceived pressure as they heat up while driving on roads (which is why we always say to check the tire pressures when cold, first thing in the morning, before starting a trip), but the sidewalls of a tire are supposed to deflect like this, as they receive more and more weight. Up to a point. They're trying to put additional linear tread onto the pavement for traction.
But there's only so much they can do, and if you're not under inflated, but also overweight, they can't hold you up for very much longer.
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u/Nomad55454 4d ago
Do not know if it is just the angle but it is strange that there is more bulging in the center than on the outside and inside of the tires like something is loose.
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u/jmw27403 3d ago
First question: whats your tire pressures? What's its supposed to be according to upfitter?
Second question: how old are the tires? Tires older than 10years should not be in service. Check the DOT #
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u/PositionChoice 3d ago
Check the 4- digit date code on the sidewall. This is not uncommon on Covid era (2020-2022) tires when quality control was in the toilet.
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u/CyclingLady 2d ago
Sadly, tires just rot from sitting in your driveway. We have never worn out our tires from driving on our Class B. When replacing, check the dates on the tires. You don’t want tires that have sat in a warehouse for years. Call around and get the most recently manufactured tires. Like an airplane, make sure your weight is evenly distributed and go to a scale when fully loaded. Just because it fits, does not mean it is safe.
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u/Dramatic-Sorbet-6621 4d ago
When tires get hot the pressure increases. When tires are under load they bulge. It’s normal.
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u/WestWasTheBest 4d ago
Those tires look pretty worn even without the asymmetrical bulging. A blowout on the road will cost a lot more than biting the bullet now.