On Thu, 21 Oct 2010 19:42:45 -0700 (PDT), Tim wrote:

On Oct 21, 6:59*pm, John H wrote:
On Thu, 21 Oct 2010 22:47:44 GMT, "A.Boater" wrote:
19.5" tires last about 4-5 times longer than 16" tires and I can change them
in my own garage with $12 worth of tools.

http://www.youtube.com/watch?v=hhaKI-IdGJg

It almost looks like the guy is putting 19" tires on 17" rims. :)

It does seem as though the bigger tires would last longer, but BAR brings up a
good point about the speedometer. The new ones, as I mentioned, offer three
wheel sizes, but there is no change to the transmission. I just looked at one of
the Silverado forums, and it seems the big problem would be rubbing when
turning, unless the truck is lifted.

I'll talk to a dealer and see what they say. The tires on this truck are in
great shape, so I won't be doing anything for a while.
--
John H

All decisions are the result of binary thinking.

John, the transmissions are the same but the speedo sending unit is
calibrated differently. Plus, the bigger tire will give you a higher
gear ratio, and will do pretty good on daily driving, but would put
extra load on it in a haul.

Depending upon the aspect ratios of the tires, the bigger tire would be very
close in diameter to the 'smaller' tire.

A 235/85R16 has a diameter of about 31.7". A 225/70R19.5 has a diameter of about
31.9". That's getting pretty damn close. (And that's assuming I did the math
right.)
--
John H

All decisions are the result of binary thinking.