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. And the acceleration was only
slightly different because only the 1st gear part of the acceleration is
going to be changed much. After that, the gears keep the engine near
it's optimal power range for acceleration. On the highway, the engine
will be operating at 26% lower RPM, so depending on the power curve of
the engine, mileage could go either way.