Tire replacement

I see that the left rear tire on my '97 855 is getting kind of bald. I
found a screw in it some time ago and apparently ran too long before
getting the problem fixed.

The right rear still had a goodly amount of tread on it although it
certainly is not new.

Do I need to replace BOTH rears at the same time? I have hard this
advice for *some* cars but wonder what the A.A.V group has to say.

 

Normally you should replace all 4 tires at the same time for best wet
weather braking and handling; if you rotate every 5,000 miles or so the
tires will last longest and all wear out at the same time. If not
economically prudent, at least replace both fronts or both rears at the
same time.

My two cents worth.

 

Thanks. That's kinda what I thought. I just hate to discard a good RR
tire so as to replace the LR tire. The fronts are in very good shape.

While I haven't rotated the tires, *this* particular problem arose
because I got a screw in the LR and apparently ran it for some time
before I became aware of the problem.

 

If my spare was junk (like mine usually are) I'd buy 2 and stick the one
remaining good used one on the spare rim.
Or, if my spare was new or better than the one on the ground, I'd mount
it and buy another like it to replace the bald one. Then the used one
becomes the spare.
But then, I'm a cheap old bastard with a 25 year old 245.
It'd probably quit running if I put four new rags on it at the same time.
Of course, if you have one of those silly little hide a spare spares,
disregard all the above.

 

Dear "cheap old bastard" from another one. Alas, the '97 850 comes
with a "cheater spare" so I'm stuck.

Thanks anyway. I long for the old days when there were five *real*
tires on a car and they could be cross-rotated without fear of losing
tread since one tire was trained to run one way and would then be
forced to counter-spin due to rotation. The last non-Michelins I had
were cross-rotated and I had three tread seps in two months.