Yeah...just had to order one of those on Friday.
By the way, to all Colorado owners (4x4). Just
a note of caution.....the spare tire on these vehicles
is a full size, but for some reason it is not the same
circumference as the regular tires on the vehicles.
We've seen 2 or 3 Colorado's come in the shop
with the front diffs basically melted because the
person had a flat tire, threw the spare tire on, and
then ran in 4hi with the spare tire. Obviously, the
front diff is the weak point when it comes to
So check your spare tire, if it doesn't match the
circumference of your regular tires, use it, just
don't use 4hi unless you are in low traction
conditions. These other customers frankly
deserve what they got, as nobody should be
running a truck on high traction surfaces with
Try the math.
(First, make the correction I made in another post, to 265's, not 285's.
And before you make a smartass comment, this shrinks the difference, but
most decidedly does not eliminate it)
Sidewall height: 265 * .75 = 198.75
To inches: 198.75 / 25.4 = 7.82
Total tire height: 15 + (2 * 7.82) = 30.65
Circumference: 30.65 * 3.14 = 96.24
And for the spare:
Sidewall height: 235 * .75 = 176.25
To inches: 176.25 / 25.4 = 6.94
Total tire height: 15 + (2 * 6.94) = 28.88
Circumference: 28.88 * 3.14 = 90.66
Thanks for playing.
I know about the tire, I found out when I had a flat! In the book, they
tell you to rotate the tires with the spare. Since it had a different
rim, I decided just to rotate the 4.
BTW, what pressure are the 4X4's running in the tires
Frank S. wrote:
Its the place to stay unless you change tires, ie load rating. Not
the recommendations can cause issue. Look at the first 4 years of Corvair.
Chevy said 19 psi for the front tires, but old timers in the field felt that
low Going to a higher pressure caused handling issues, that were corrected
when Chevy put a sway bar on the front axle. Chevy knew there could be
because of suspension loading because of the light nose and rear suspension
By recommending a lower tire pressure in the front, this off set the loading
issues, and handling wouldn't have been any more of a problem for the rear
engine corvair then it was for the early Porsches, VW's, or rear engine
Citroens, Fiats and Renaults of the same era. Sometimes those engineers
really do know what the hell they are talking about.. Of course they ended
up adding a 6 dollar sway bar because people seldom follow the
It should be noted that the Cadillac Eldarodo used the same thinking only in
reverse, 19 psi in the rear tires to balance handling.
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