On Saturday, July 29, 2017 at 12:21:28 PM UTC-5, dsi1 wrote:
> On Friday, July 28, 2017 at 9:44:45 AM UTC-10, Roy Tremblay wrote:
> > What do you think about the 4-tire rotation pattern below?
> > X > H > X > H year 1
> > X > H > X > H year 2
> > etsetera
> >
> > Basic assumptions:
> > Assume the alignment is within spec.
> > Assume the fronts consistently wear differently than do the rears.
> > Assume that F->B differential wear is symmetric per axle.
> > Assume the spare is a donut and therefore out of the picture.
> > Assume a rotation every change of seasons (about 4K miles roughly).
> > Assume bidirectional tread.
> > Assume whitewalls on one side (otherwise I could flip them on the rim).
> > Assume USA crowns, which is to say almost no crown most of the time.
> >
> > How does the logic of this X > H > X > H rotation pattern look to you?
> >
> > Assume tires go on in year 1, front to back, numbered:
> > 1 2
> > |
> > 3 4
> >
> > The first X-pattern rotation in Spring of year 1 gets us:
> > 4 3
> > |
> > 2 1
> >
> > The H pattern in Summer of year 1 gets us to:
> > 2 1
> > |
> > 4 3
> >
> > The X pattern of Fall of year 1 gets us to:
> > 3 4
> > |
> > 1 2
> >
> > And then, finally, the Winter H pattern of year 1 gets us back to:
> > 1 2
> > |
> > 3 4
> >
> > At the end of the year, with this X > H > X > H pattern I devised, I think
> > the tires would have been on every combination but always as a set per axle
> > because my fronts wear differently than do my rears.
> >
> > If I flip them on the rim, does that help in giving me rotation options?
>
> My guess is that tire rotation is mostly a device used by tire companies to get people to come into their shops on a regular basis. I've never done it nor am I likely to ever start. I don't have enough time and money to just toss it into the wind.

Rotating tires and re-balancing increases their life and places like Discount Tires do not charge for the service.

Not doing so is "tossing money into the wind".
But tire companies love you. :-)

Andy