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Old 03-25-2016, 10:40 AM   #1
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Thor Owners Club
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Location: Dallas Texas
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Tire Wear

After a short trip of 150 miles noticed that RF tire has flat spots around the edge of the tire. Any thoughts. We have 15,000 miles on a 2 year old Thor Challenger 36FD

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Old 03-25-2016, 11:34 AM   #2
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Most likely, with the little miles on your RV, it's alignment, not a worn shock. I'd get it aligned and see if that helps.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 03-25-2016, 03:55 PM   #3
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If the flat spots are on the inside it is toe-out and if inside the tire you have too much toe-in,
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Old 03-25-2016, 04:10 PM   #4
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Had the same thing when I first bought our current coach. Took it to an alignment shop and they had to bend he axle to fix it.

Put on a new set of Bridgestone tires on the front after the alignment.

Since then, ~7 years, we've put on ~55K miles and the tires still look like new. I know I'm going to have to replace them due to age but they still look great.
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 03-25-2016, 04:33 PM   #5
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Loose wheel bearing, bad shock, tire out of round, tire not balanced. The flat spots are where the tire is "skipping" as it goes down the road. Once it starts, the only way is the fix the problem and replace the tire. We ran semi trucks for years, I've seen a lot of it...
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Old 03-26-2016, 09:01 AM   #6
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Agree with Mike. Flat spots, as opposed to continuous flat wearing, indicates a problem with balance, shocks or bearings. It is NOT alignment (toe, camber, etc). The tire is bouncing up and down. Start with wheel balancing, since the coach is almost new and probably hasn't worn out shocks or bearings yet.

However, a wheel alignment would probably not be a waste of money. A bouncing wheel can stress the front end enough to push it out of alignment. It's also a good idea to get the alignment updated once you have your gear onboard. The factory does it empty, and your stuff changes the load & balance. sometimes quite a lot.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 03-26-2016, 10:16 AM   #7
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Try poor man's alignment check.

Drive on a flat road or get on the center of the crown and let go of the wheel.

Does it drift one way or the other? .

When parked get a good level and a length of wood that will allow the level to check the rim not tire.

Park on flat level ground and with wheels straight check vertical for angle as it will not be perfect so use a ruler to measure how far from level the tire is and compare to opposite.

Next turn full right measure then full left.

The alignment shop does same thing with better equipment.

Bot sides should read same but if one different then alignment is bad.

Both same also could be bad but in a different way.

Flat spots indicate scuffing and could be lots of turns in drive or an alignment issue that causes that wheel to not be tracking properly.

Toe - in could cause this but both tires usually have it.

Harder to measure but you can measure by placing level on front and back of tire to mark the ground then draw a line connecting dots and do on both sides.

Mark a reference point such as center of wheel.

Back up and figure out the angles...If closer in front then toe-in.

Specifications are in degrees which is a bit more math.
Tony & Lori
1989 Country Coach Savannah SE
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Old 03-26-2016, 10:39 AM   #8
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Originally Posted by Hoegee View Post
After a short trip of 150 miles noticed that RF tire has flat spots around the edge of the tire. Any thoughts. We have 15,000 miles on a 2 year old Thor Challenger 36FD

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