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Old 04-25-2012, 07:41 PM   #1
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Tire/Rim Upgrade Complete.

Well, one more task to cross off my to-do list on the TT

I was still running the original Maxxis tires that came with my 2005 Eagle, but I noticed last fall that one tire was starting to show signs of sidewall cracking, so it was time to replace them.

My TT came with Maxxis ST225/75R15, "C" Load Range, tires that were "just enough" for my loaded TT weight, excluding my 1,250lb loaded tongue weight, so I was always a little nervous running with a tire that was spec'd so close to my TT weight (all RV manufactures do it).

I know I may incur a little flak on this, but in lieu of a new set of Maxxis I went with the newer Carlisle "RH" Radial ST225/75R15, "E" Load Range: http://www.tirebusiness.com/subscrib...&id=1308762257 & http://www.carlisletire.com/products...ail/index.html

With the "E" Load Range I will have plenty of "weight" cushion, and I'm hoping that this alone will eliminate any potential tire issues that some folks have reported with some Carlisle trailer tires. I also confirmed the date code on the new tires..., manufactured two months ago. Also, based on positive feedback from a couple of friends that have been running the Carlisle RH "E" Load Range tire also provided me with some confidence in the tire as well.

The Maxxis "D" tires aren't available, and the "E"'s start to get a little pricey (wasn't a factor for not going with them), but they can be difficult to get if I should need a replacement while traveling.

Anyway, since I went with the "E" Load Range tires my existing OEM steel rims fell short of the 80 PSI requirement for the new tires. Looked into a number of different aluminum rims that met the tire specifications, and decided to go with the MB-72, 15X6 6-139.7 0MMS, steel stem.., aluminum rim sold by Discount Tire: http://www.discounttire.com/dtcs/whe...il.do?pc=69244





If I was asked to make a trailer tire recommendation, I would still respond with "Maxxis"..., so I'll wait until I get some history with my Carlisle's before I offer them to anyones short list.

Bob
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Old 04-25-2012, 07:49 PM   #2
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They look good and also very capable, Bob. What`s next on your to-do list?
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Old 04-25-2012, 08:03 PM   #3
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Lee,

Plan to install (hardwire) my EMS in-line surge protector while I'm at the CG, leaving tomorrow morning

Bob
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Old 04-25-2012, 09:00 PM   #4
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Both rims and tires have a nice look to them. May they last you a good many years!
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Old 04-25-2012, 09:42 PM   #5
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Those tires and wheels do look good. I wouldn't run those tires at max pressure especially in the hot summer when the tires get hot they could reach 100lbs or more. But that's just me.
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Old 04-26-2012, 06:03 AM   #6
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They look really nice, Bob. Here's hoping you have great luck with the Carlisle's.
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Old 04-26-2012, 07:15 AM   #7
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Tire inflation.., I guess there are a number of different schools of thought on the subject.

I've always inflated my trailer 'ST' tires to maximum specified PSI as stated on the sidewall, but I do under extreme conditions (heat, altitude changes, etc.) check the psi a little more frequently watching for any irregularities. I have also found that maintaining the maximum psi with a trailer 'ST' tire it will minimize sidewall flex in turns.

In the case of the Carlisle 'ST' tires, they state that they do not endorse the reduction of air pressure. "Carlisle Tire & Wheel only recommends and only warrants tires maintained @ the max air pressure while in service." They went on to state that "Maximum load range is attained when the tire is at it's maximum air pressure. There is no advantage to taking air out of the tire. With maximum pressure, the tire will preform and wear better, and you will get better gas mileage. Reduce the psi, and you compromise the functionality of the tire. This is the position we take on this."

Years ago on a prior TT I did consider reducing the psi in my trailer tires because my loaded weight was below the tire's load range, but most of my findings told me that it wasn't required and that it may impact the integrity of the tire......, so I have left well enough alone since then.

I also found that unless there is a stamp on the tire that says otherwise, trailer 'ST' tires are rated for 65mph maximum. I'm good here because my TV's sweet spot when towing my TT is 62 mph

Bob
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Old 04-26-2012, 07:33 AM   #8
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Quote:
Originally Posted by rwilley View Post
Those tires and wheels do look good. I wouldn't run those tires at max pressure especially in the hot summer when the tires get hot they could reach 100lbs or more. But that's just me.
It is called cold inflation pressure for a reason.. manufactures take into account heat pressure expansion when coming up with an inflation number for the tire.. ONLY WORRY ABOUT THE TIRE PRESSURE WHEN COLD!!
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Old 04-26-2012, 12:03 PM   #9
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Originally Posted by Rustic Eagle View Post
Tire inflation.., I guess there are a number of different schools of thought on the subject.

I've always inflated my trailer 'ST' tires to maximum specified PSI as stated on the sidewall, but I do under extreme conditions (heat, altitude changes, etc.) check the psi a little more frequently watching for any irregularities. I have also found that maintaining the maximum psi with a trailer 'ST' tire it will minimize sidewall flex in turns.

In the case of the Carlisle 'ST' tires, they state that they do not endorse the reduction of air pressure. "Carlisle Tire & Wheel only recommends and only warrants tires maintained @ the max air pressure while in service." They went on to state that "Maximum load range is attained when the tire is at it's maximum air pressure. There is no advantage to taking air out of the tire. With maximum pressure, the tire will preform and wear better, and you will get better gas mileage. Reduce the psi, and you compromise the functionality of the tire. This is the position we take on this."

Years ago on a prior TT I did consider reducing the psi in my trailer tires because my loaded weight was below the tire's load range, but most of my findings told me that it wasn't required and that it may impact the integrity of the tire......, so I have left well enough alone since then.

I also found that unless there is a stamp on the tire that says otherwise, trailer 'ST' tires are rated for 65mph maximum. I'm good here because my TV's sweet spot when towing my TT is 62 mph

Bob
I guess you should run what ever you are comfortable with. But 80 pounds is pretty hard and will run rough. You shouldnt be close to max weight so you dont need to run at max pressure. My truck has E rated tires but if you look at the sticker inside the door it says to inflate tires at 65 pounds loaded. Anyway the tires look good and they should serve you well and I didnt mean to open a can of worms.
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Old 04-26-2012, 04:42 PM   #10
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snip.....and I didn't mean to open a can of worms.
rwilley,

No problem on this end, and I view all replies/experiences as a contribution to the discussion. Your correct that my loaded TT weight is below the "E" tire weight capacity, and even a "D" load range tire would have given me a "little" weight buffer as well.

As you mentioned, I also adjust my TV's LT tire pressure below the tire's 80psi maximum, especially when unloaded and not towing my TT.

The one thing that I found different with TV and TT manufacturer's posted tire psi stickers, is that on TT's it seems to always reference the OEM tire's maximum psi based on the load range supplied with the TT. I wonder if trailers/tires are looked at differently than a TV? Might also have something to do withe fact that RV manufactures tend to size the load range of the tire supplied with that of the TT's potential loaded weight

But your right, running at maximum psi will give my TT a stiffer ride.

I agree, the wheels/tires look good in the photo, I just hope that I can say the same in three years

Bob
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