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Old 07-23-2009, 01:43 PM   #1
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Default It may be new tire time......

I've read posts from Ron and marko et al about their experiences with tires and replacing them.
Just wondering where to get some replacements for our '02 RT C190P?
I believe they're LT245 75R16E sized Bridgestones on it right now. They're not too bad, but
will probably need replaced soon.
Can anyone recommend a decent tire/price/place to buy (sorry, in Canada might be nice,
but in the States works too I suppose ). I've seen Michelins mentioned. I've had them in the
past, for other applications and had good experiences.
If Formula One is anything to go by, they say the Michelins are a softer rubber compound
than the Bridgestones. Not sure if this is relevant when talking about RV tires.
I've googled and checked Canadian Tire, but some comments are negative about their stuff.
Maybe I should consider GM for replacements?
I'm also wondering about going to a 17" tire to get better mileage. Anyone ever looked into this?

Comments or suggestions?
ty.
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Old 07-23-2009, 02:54 PM   #2
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Default Re: It may be new tire time......

FWIW, I'd stop debating with myself after mentioning Michelin. I've had them on everything since the '70s when I was first introduced to a set on a company Pontiac Station Wagon that I put a lot of miles on and found them to be indestructable. I have Michelons on my van. Third set now, since buying it in 1995 with Coopers on it that went away quickly. My tires are the factory recommended (and GM dealership endorsed) LTX M/S version. When I had bigger rigs (Class C and A,) they were also outfitted with Michelins and no thought given to tires after that -- other than regular pre-travel air pressure check.

Other's results may vary, but I don't think I'd change my mind after this many years of un-troubled success with them. Price-wise, incidentally, I find that I buy them more than $200 cheaper for a set of four here in the Ozarks than an RVing friend in St. Louis could after shopping around.
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Old 07-23-2009, 11:18 PM   #3
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Default Re: It may be new tire time......

Thanks Vern. I've always had good luck with Michies. They ride smooth and stick like glue.
I think they might be the way to go, but I'm waiting to hear back from the local GM dealer.
Any thoughts on going to a larger rim size (17"), for the mileage? It looks like a 17" or even
an 18" tire/rim would fit in the wheel wells.
I need an automotive engineer for this one i guess.
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Old 07-24-2009, 03:50 AM   #4
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Default Re: It may be new tire time......

FWIW, I read on one of the RT Forums recently about folks recommending tires, etc. One of the folks sent an e-mail direct to Michelin about the tires for his year RT, believe 190P. He posted the response, and in a capsule Michelin recommended their XPS tires. I had seen numerous Trekkers say they had put them on their vehicle and it provided a great ride. While on the subject of tires, there was a lengthy discussion about the "manufactured date" for the tires. Michelin had come in and said the idea that someone would not take a tire manufacturered longer than "x" date; Michelin said they warrant their tires from date of sale, and also that quite possibly that size, series tires have not been manufactured for a while - due to not having a heavy demand. We know they will cost a bundle, so you might also make a query of Michelin. As for where, I have read the "warehouses, Sam's, CosCo, have great deals.
Let us know what your final resolve is, we're all going to face this eventually.
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Old 07-24-2009, 08:16 AM   #5
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Default Re: It may be new tire time......

I don't think I'd change wheel size, Ron. The manufacturer of the chassis spent a lot of bucks on engineering to put the combination together.
To alter the wheel size can't accomplish much in mileage and might accomplish something you wouldn't want, I fear.
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Old 07-24-2009, 02:55 PM   #6
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Default Re: It may be new tire time......

That was me that was wondering about the tire size/gas mileage thing, Vern.
I'm not going to do anything that would compromise safety, and I know
there was some engineering involved in determining the factory shipped
size of the wheels and tires. I'm just curious about it.
Still waiting for the GM guys to get back to me.

Mike.
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Old 07-24-2009, 04:58 PM   #7
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Default Re: It may be new tire time......

Mike - you're always thinking of something I like that and also that you share your ideas here for open discussion.

I think your speedometer reading would be wrong with larger diameter tires. Maybe it could be adjusted. I don't know if it would be fast or slow.

I always figured I would try to get the same brand and model of tires that were on my RT when it came time to replace them. I was very satisfied with the Bridgestones it came with. Of course if they were too expensive I'd look for an alternative.
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Old 07-24-2009, 09:26 PM   #8
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Default Re: It may be new tire time......

That's such a nice way to dance around using the term "crackpot".

I still haven't heard back from the local GM guys, so I sent the same questions to
the GM dealer I used to deal with when I lived nearer to them. So far, nada from either.

Since you asked, try this little beauty out when you have time.
http://www.1010tires.com/tiresizecalculator.asp

It has a few disclaimers and warnings below the actual data areas, and one refers
to the potential for brake failure by "plus sizing" more than 3%. It also says it's not
absolute in accuracy. But it is cool!!!
After running some numbers, the only way to get any sort of meaningful increase in
gas mileage, would involve increasing the diameter to 18", which would put the gain
in the 6% range, which is double the acceptable amount of recommended modification.
It also gives data regarding speedometer variance, and tire revolutions per mile.
I'll guess the best I could do would be about 3% from an increase to a 17" rim/tire.
So I'd save about $30 in gas for every $1000 spent. Not sure if it's worth it.
Still, I'll wait for the opinions of experts, before tanking this one.

Mike.
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Old 08-13-2009, 01:28 AM   #9
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Default Re: It may be new tire time......

As expected, GM Canada responded with "we only recommend OEM tires and size specs".
So, today when I got the oil changed I asked the service manager and he said he knew
that many people aren't impressed with the OEM original tire size specs and routinely
go larger. He also said he had a customer go to an oversized rim/tire and GM wouldn't
provide a program mod to adjust his odo/speedo computer readings to compensate.
I guess they've got enough to worry about without adding any non-standard tire size liabilities to their list.

The quest continues. I should get one more longish trip out of my current rubber.
After that, I have to decide which way to go. I like Michelins.

Updates to follow (as usual).

btw, I checked the prices of Michelin LTX M/S in the oem size and they're about
C$275 + 13% tax each, installed. Can somebody recommend a better place than
GM to get a set? Canadian Tire also has them for about the same price. I've googled, but
I don't think online tire sales are the way to go. I can't seem to get any real tire dealers.
To my American friends on here, where do you get yours and how much do you pay on average
for them? If I stay in the US for 7 days, I can import $750 duty free, and so can my wife.
So, "buy American" might not just be applicable for you guys.
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Old 08-18-2009, 11:08 PM   #10
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Default Re: It may be new tire time......

Regarding size of tires. I've been corresponding with a gent on RVNet who used to be a parts desk
phone order guy for a parts distributor, and also was a salesman for cars and trucks in a previous incarnation.
He said the better choice if you want to plus size a bit on your tires would be a slightly taller
LT235/85R16E as it fits the stock rim, and won't stress the engine (5.7L) or the brakes.
As for the type, I think BF Goodrich All Season T/A Commercials might be the way to go.
They fit all the technical requirements and are less exoensive than the Michelin LTX M/S.
And, they're made by Michelin (I think?). They're touted as being a bit stiffer with an extra
mm of tread depth than the regular T/A Radials. I'm hoping they won't be noisy at highway
speeds.

As far as where to get them, I'm leaning towards Costco (requires a membership $57.75/annum)
or possibly Walmart. Both companies offer really good pricing and if purchased during a 7 day trip
to the US, they will be importable (set of 4) without duty charges by me alone.
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