[Shant]

I’m looking to get new setup and I was wondering will I rub if I run 275/30/20

[Bimmer Frank]

Originally Posted by Shant

I’m looking to get new setup and I was wondering will I rub if I run 275/30/20

That appears to be a slightly smaller diameter than stock so I would think it would work, but I am by no means an expert:

https://www.wheel-size.com/calc/?whe...cl=50mm&sr=0mm

[Dave07997S]

No you should be fine, the more important aspect is the width of the wheel and the offset.

[M2 CCO]

You won’t rub. I’m running 285/30/20 on 20x10.5 wheels +14 offset on the front and they don’t rub at all.

[ajchoi]

Originally Posted by M2 CCO

You won’t rub. I’m running 285/30/20 on 20x10.5 wheels +14 offset on the front and they don’t rub at all.

Yep, I’m running 20” 1000M front wheels with the same tire size and no rubbing at all on stock suspension

[Teto]

And why do you change the diameter of your tire?
Don't you think that if it comes like this from the factory it is for a matter of stability? By changing the diameter of one of the axles you are modifying the weight distribution.

[Bimmer Frank]

Originally Posted by Teto

And why do you change the diameter of your tire?
Don't you think that if it comes like this from the factory it is for a matter of stability? By changing the diameter of one of the axles you are modifying the weight distribution.

The diameter of the tire will be roughly the same, he is going to a larger rim with a smaller ratio on the tire. The diameter is calculated by multiplying the width of the tire by its ratio (times 2) and adding the rim size.

In this case stock is 275x.35 (96.25mm*2 sidewalls) with 19 in rim (482.6mm) = 675.1mm

New setup is 275x.30 (82.5mm*2 sidewalls) with 20 in rim (508mm) = 673mm

This is called a Plus 1 size. The link I provided earlier in the thread shows a diagram of how this works.

[Teto]

[QUOTE=Bimmer Frank;31907366]The diameter of the tire will be roughly the same, he is going to a larger rim with a smaller ratio on the tire. The diameter is calculated by multiplying the width of the tire by its ratio (times 2) and adding the rim size.

In this case stock is 275x.35 (96.25mm*2 sidewalls) with 19 in rim (482.6mm) = 675.1mm

New setup is 275x.30 (82.5mm*2 sidewalls) with 20 in rim (508mm) = 673mm

I know how the equivalences work, I didn't see that it changes to a 20" rim, sorry. But then, what do you put on the rear axle to compensate? 295/25/21?