New Tires Cause constant Yaw Motion?

[JAG1]

I carry a slide in camper for a long time. How can two New E rated Michelins on the rear cause this almost constant yaw motion..... oversteer condition? Never ever happened before. The tire dealer did show me one rim bent about 1/8th of an inch on the spin balance. Would that be it? Front end is tight as a rock, but its squirrely to drive. Tires are the most expensive Michelins you can buy same as on front.

 

TIA

[Mopar1973Man]

Tire pressure?

[98whitelightnin]

Last couple sets of new tires I have purchased have been squirly for the first 1000 miles or so but they werent michelins.

[JAG1]

2 hours ago, Mopar1973Man said:

Tire pressure?

Fronts were a bit low at 65 psi. I hope that's at least part of it. Thanks Mike.

 

20 minutes ago, 98whitelightnin said:

Last couple sets of new tires I have purchased have been squirly for the first 1000 miles or so but they werent michelins.

I have heard of that too and I went about 1400 miles to go see IBMobile up in the mountains right after purchasing the tires. I hope thats the other part of what's causing it as Its seems a bit better coming home, just not sure. They came with quite a lot of factory sipe in the tread, if that takes a while to break in too.

[NIsaacs]

I had the same problem with only changing two tires at a time. For some reason old Michelins don't play well with a set of new tires. Here is a thread on my experience. I recommend changing the front's out too.

 

https://www.turbodieselregister.com/threads/strange-michelin-behavior.258287/

[wil440]

I put 4 Toyos Mud on 2 or 3 months ago 315/85 I think.... they don't feel right at all, even had to put the steering damper back on still the same, was horrible with my TT hopefully better with my new ( to me)5th wheel which I haven't collected yet

[Dieselfuture]

Michelins supposed to be a good tire, I had good luck with them on several cars/SUVs, I used defenders on those. Even had some 16r20 xzl and xl on my toy truck . They seem to last long time with little balance if you don't mind hwy tread. Of course I didn't bother to balance 16r20s ha ha.

Not sure what you got but hopefully just need time to break in. 

[JAG1]

Thanks Dieselfuture, yes they are defenders made in the U.S.A. Imagine that! 

 

I think I better take a second look at the front end linkages too while the wife does the wheel wiggle for me.

[Mopar1973Man]

Caster angles could possibly affect the thrust angle of the truck slightly too. 

 

Might tire checking tire pressure and maybe do a tire rotation.