On 7/19/2017 11:33 AM, Mad Roger wrote:
On Wed, 19 Jul 2017 11:04:20 -0700,
Bob F wrote:

Some people that increase tire size will change the gearing to
compensate. Otherwise, your shift points will change, your speedometer
will be in error.

I tried to phrase the original question to keep compensation out of the
picture because with compensation, anything can change.

I just wanted to know more about the physics of larger overall diameters.

So far, no reference has given a single good performance impact that
results from just the one change of diameter.


It will be like always driving with a slightly higher gear.

Prius cars are using low profile tires. Do you suppose they have a
reason for that? They aren't necessarily larger tires.

Just putting a bigger tire on your car is going to decrease your
acceleration, and likely increase your highway mileage, depending on the
car engine's power curve, unless you re-gear to compensate.

It also may increase your turning radius, or damage your front tires if
you forget and turn too tight.