Our 1990 28' Regal has a habit of wandering to the right while driving it. It scares my wife and tires us both out as we have to compensate constantly. It's like milking a cow. Our mechanic said that he took it for a test drive and he believes it's because the tires are to narrow. What's the largest and widest tires that I can put on the front? Maybe that will solve the problem. Ron

Is it a P-30 (GM) chassis? What size tires are on it now? My opinion: it probably is not the tires, and definitely not their width.

Hi Gunner,

Thanks for the quick reply. It's and Oshkash chassis which is the same as a Freightliner. Is that a P-30? The tires on it are Michelin 8R X 19.5 (Side walls are 1 ply and tred are 4 ply). What are the widest tires I can use and will this help the problem of drifting to the right?

Ron

You can go to 225R7019.5 but that is it! they are wider then the 8R19.5 by a lot but they are also much lower profile, they are about 1 inch smaller in diameter, you will give up some speed/RPM with the 225.

The 245R19.5 is the same diamter but requires a 6 3/4 inch minimum wheel width (preferably 7 inch), yours are probably only 6 inch and there are not many choices for that width wheel.

When I unknowingly had a right front air bag go out, the Euro pulled to the right some, not bad but enough that you were always countering. I run the skinny fronts and wanted to go wider but was talked out of it. New air bags properly inflated [i run 55 pounds], made her go straight as an arrow. The p30 is the GM chassis, which I have. Don't know if you have bags or some other suspension components that may effect handling.

That sounds more like an alignment problem than anything else. Find a place that will do a four-wheel alignment, & have it aligned to factory specs. Odds are that will do the trick. Be sure it is checked for worn, bent, or damaged suspension components. They can cause handling problems even if alignment is done to specs.

I once had a problem with a Michelin that had a misaligned belt that made the rear end of My S.O.B. squirm. A previous owner spent big bucks trying to solve the problem, but it took a non-mechanical friend to clue me to the fact the tread was skewed. Another Michelin self-destructed parked in a storage lot. You might also visually check your tires to be sure they run true.

I had a problem similar to yours. It was the steer safe on the front end. It took a few tries but I got it aligned and it runs true now.

Good luck.
Rick