Just enquiring about staggered wheel set ups, do all 4 wheels have to have a similar rolling radius, on 4wd VAG cars they do, just wanting to know with Subaru's, thinking 8's and 9's x 18 with 225/40 and 235/40 set up or similar

Thanks

 

I had a situation where fitting new tyres to one axle with worn tyres on the other created a vibration in the gearbox DCCD under load (accelleration). This was picked up by Zen Performance after intial concerns that it was a fault in the box, but measuring the circumference of the tyres showed a difference of 6mm. Fitting new tyres solved the issue.
So to answer your question based on my experience, depending on which model Subaru you go for, I would say a significant difference in rolling radius/circumference on front and rear axle could have a damaging effect on the car.

 

Even slight differences in rolling radius over a prolonged period can scupper your centre diff, just best avoid.

 

nice one cheers, thought this would be the case, similar issue with r32 golf

 

If you think about how it all works, it's going to be an avoid scenario.

It's like having a model loco with all coupled wheels...slow one wheel down, or speed it up, the whole lot is fooked.