Thread: Prius 75-91mpg
View Single Post
Old 04-22-2019, 11:54 AM   #26 (permalink)
Master EcoModder
Ecky's Avatar
Join Date: Dec 2011
Location: New Zealand
Posts: 4,691

ND Miata - '15 Mazda MX-5 Special Package
90 day: 36.7 mpg (US)
Thanks: 2,562
Thanked 2,275 Times in 1,410 Posts
Originally Posted by Nathan jones View Post
Thanks, they will be reduced from 65 to 45mm. Only for weight, car height and acceleration. Width will be slightly increased from stock as they are now
Unfortunately I think this may undermine what you're trying to achieve.

By going smaller, you *effectively* make the wheels heavier, because they have to spin at higher RPM for a given road speed. This is normally close to a wash, but by going wider at the same time you're definitely going to cause the wheels to hold more angular momentum, even if they weigh less on a scale.

Most cars would "feel" like they accelerate more quickly with smaller tires, but it would be because they're now geared lower. I don't know if this applies in a Prius.

You would achieve your goal of lowering the car, but you'd also likely hurt both aerodynamics and rolling resistance (all else being equal) with a smaller, wider tire.
  Reply With Quote