On Wednesday, July 19, 2017 at 3:58:17 PM UTC-4, Bob F wrote:
On 7/19/2017 12:18 PM, Mad Roger wrote:
On Wed, 19 Jul 2017 11:28:11 -0700,
Bob F wrote:

They change the gear ratio, eliminating the difference. Jeeeze!

And that 25% difference is going from a 15" to a 19" wheel, and
similarly larger tire diameter. Who does that without changing the gearing?

Thank you for pointing out my error of the 25% loss in torque being from
only a 1 inch change.

I misinterpreted the Ed Pawlowski article.
https://www.carthrottle.com/post/how...t-performance/

The 25% loss of torque came with a four inch change in diameter!

But it's still a loss in torque.
The Car and Driver article said the fuel mileage suffered also.

Effects of Upsized Wheels and Tires Tested
http://www.caranddriver.com/features...d-tires-tested

"What's immediately apparent from the results is that as the wheel-and-tire
packages get larger and heavier, acceleration and fuel economy suffer.
Neither is a huge surprise, but we measured a 10-percent drop in fuel
economy and a four-percent degradation in 0-to-60-mph acceleration from the
15s to the 19s"


But of course, that fuel economy was based on odometer readings, which
are reading 26% low with the 19" tires.

I would give Car and Driver credit for accounting for that in their
testing. What;s also interesting is that they made a 4" change in
diameter and saw only a 4% decrease in acceleration, which is very
different than what was claimed in that other article, where there
was huge alleged difference in acceleration with just a 1" change.