Knowklew

So I am trying to figure out the limits of the computer.

Stock front OD is 25.6 (275/35-18)
Stock Rear OD is 26.7 (325/30-19)
Difference of 1.1 (front to rear)

What is the maximum difference I can go without making the computer wig out? Anyone know?

My current set up:

Front OD 25.7 (285/30-19)
Rear OD 26.8 (345/25-20)
Difference 1.1 (same as stock)

Trying to figure out how to get a DR on the back but its a bitch to find a size without needing new rear wheels.

Knowklew

Quite the mystery apparently.

Patriot Six

I believe it's a rear:front ratio of 1.04 that you don't want to exceed. However, I have exceeded that with DRs and all I get is an Engine Drag Active warning on decel, which is no big deal.

Shaolin Crane

I have 285 30 19 with 345 30 20 and the computer is happy.

Knowklew

Right. I already posted that my current setup works. I am trying to figure out what is the maximum difference front to rear. I want to run a DR in the rear but there are limited sizes available.

Shaolin Crane

Yes, but my setup is not the same size. My rear is a 30 and has quite a bit more side wall at 28.1" overall. My understanding is that the tires can't be too close to each other in size, the rear needs to be at least .5 taller but theres no limit going taller.

Knowklew

Thanks. I will see what I can find available.

grady

If you are doing DRs for actual racing, I thought most guys who do so go with a 15” wheel.