Back on subject.
Not mentioned above
Wheel widths affect rollout.
Lathing/grinding/tooling can also yield measurable changes.
Also my 2 cents
While growing tires with heat/pressure is a simple enough concept, shrinking tires isn't much more difficult IMO.
A smaller tire's rotating weight is also closer to the center of rotation, taking less energy to spin it than a larger tire. I would choose shrinking over growing if the numbers allow.
Not mentioned above
Wheel widths affect rollout.
Lathing/grinding/tooling can also yield measurable changes.
Also my 2 cents
While growing tires with heat/pressure is a simple enough concept, shrinking tires isn't much more difficult IMO.
A smaller tire's rotating weight is also closer to the center of rotation, taking less energy to spin it than a larger tire. I would choose shrinking over growing if the numbers allow.