Can I do a 4.27% tire stagger on a Prius?
 

195/65/15
175/65/15
Taller is 4% shorter and turns more revolutions**

You guys think a 4.27% smaller diameter tire on the rear of the prius will still allow the abs tcs system to function?
2010 Prius (Gen III)
The tire is load permitting and it would be nice to see a further 9.62% reduction in rear rolling friction coefficient for basically free since I'm needed to replaced 7 year old wide non lrr tires on my prius.
Its basically the same type of crazy tire stagger stuff the really range restricted electric cars do to pick up range
I'm thinking it will make the car see the front wheels are turning slower and could affect abs/tcs intervention but could be positive or negative.
This car is allergic to front wheel slip tcs wise its too restrictive. It would rather not move at all than allow wheel slip (aka dont park on grassy hills, very embarrassing to punch in a cheat code in your car for 5 minutes to be able to move). So it could possibly improve the situation.
But it could also just be such a great difference it shuts the system off right off the bat like the C5 corvettes when going from stagger to no stagger...
Thoughts?

You'll also be lowering the back of the car, which will negatively impact aerodynamics. I wouldn't do it. Maybe if you went with something like 175/75r15.

Well the car already has a huge rake so it still will sit with a rake and not level if it matters.
Rear only drops 0.51"

Why does it have a rake? What tire sizes do you have on it now? It should be level from the factory.

Most cars do it to look cool. It supposed to look "more aggressive"
Some designs even have a rake built into the body so the car looks like it has a rake to it when it is level.
195/65/15 Cooper CS3.

I think I've decided on 185/65/15 up front and 175/65/15 in the rear. Only a 2% difference which should work and will let me reduce my rolling coefficient how I want to. Think load support is unchanged, but lateral grip is decreased. For the most part its not a race car so I'll accept it.
Ill go from 6.2" tread width dry rotted non LRR tires front and rear to: 5.6" & 5.2" combo front and rear that Is LRR. So It should give me the double bonus of a better compound and narrower width. Also OEM speedometers are 2% faster than normal so It will put it back to spot on.

I did it on my wife's hyundai when I went to large tires. 2 of them still has some life left on them.
But traction control on hyundai cars I'm 2008 was kind of basic.

Someone ran over sized front tyres on a Prius and found that the CVT will compensate as the ~2700rpm cruising speed coincides with BSFC. I don't think ABS/TCS was mentioned though.

My Prius speedo is pretty much dead on vs GPS.

Most cars have rake so they sit level when loaded. The smaller the car the more noticable the rake.

Yeah its nice I don't have to worry about tire diameter for rpms. The motor is essentially disconnected from the wheels completely. The car sits around 2000rpm at 70 in flat terrain.