Need help with a 22" Staggered Setup

[ryanjoe13]

Wheel and tire experts please chime in. Not sure I really trust the guys at the tire shop as I've read on these forums that they've been wrong quite often.

Looking at a 22x9 front et40 with a 22x11 rear et40 wheel. Can I make this work without customizing the fenders?

The guy at the tire shop is saying that his computer program is showing that the 22x11 rear will rub.

One of the factors playing in here is that the difference in height of the wheel + tire from front to rear cannot be greater than a 3% difference without risking integrity of the AWD system.

I've seen that a really popular rear tire is the 315/25/22. The only 315/25/22 that the shop can order is a Pirelli that is on national back order. Sounded like it might not be available for awhile. Do I have any other options? Thanks for your help!

[Ozer]

I use this tool alot when looking for wheels and tire sizes . Give it a shot

Tire Size Calculator - Tire & Wheel Plus Sizing

[QuantumX5]

It should fit and shouldn't rub.

I'm running
22x10.5 +38 front (285/35/22)
22x10.5 +20 rear (285/35/22)

this setup is slightly taller then stock, but I hate the rubberband tire look on trucks.
There is about 1/2" gap from the top of the tire to the control arm on the front. Fits just fine.

[ard]

FYI.... the key to matching tire size is NOT looking at "diameter" (since this is static and changes when loaded)

It is the difference in "revolutions per mile" between front and rear. If the difference is 0 then the differential doesnt have to do anything.... as the delta in revs/mile increase you are putting more stress on the diff.

Look at stock BMW tire sizes and specific models on tire rack. look at that tire, go to "specs" and write down the revs/mile for the OE tires...THIS should give you an idea of the design target. Basically the BMW sizes are under half a percent difference

Where did you get 3%?

[Ozer]

If i were to change all 4 tires/wheels with 275/45/20 (rpm is 699.30) will that be ok compared to stock 255/55/18 (rpm 716.17). Will this have any affect on the differential?

[ard]

Originally Posted by Ozer

If i were to change all 4 tires/wheels with 275/45/20 (rpm is 699.30) will that be ok compared to stock 255/55/18 (rpm 716.17). Will this have any affect on the differential?

No effect on differential as there is no difference between wheels.

Is that a calculated number? or measured based on rolling diameter under rated load???

This latter question a curiosity, you can up size or downsize all 4 wheels at will- no issues with diff

[ryanjoe13]

Originally Posted by ard

FYI.... the key to matching tire size is NOT looking at "diameter" (since this is static and changes when loaded)

It is the difference in "revolutions per mile" between front and rear. If the difference is 0 then the differential doesnt have to do anything.... as the delta in revs/mile increase you are putting more stress on the diff.

Look at stock BMW tire sizes and specific models on tire rack. look at that tire, go to "specs" and write down the revs/mile for the OE tires...THIS should give you an idea of the design target. Basically the BMW sizes are under half a percent difference

Where did you get 3%?

Thanks ard.

Although the staggered looks cool and aggressive, I decided against it. Didn't want to deal with the differential issues. Also the headaches with not being able to rotate so you have to replace tires more often.

[ryanjoe13]

Originally Posted by QuantumX5

It should fit and shouldn't rub.

I'm running
22x10.5 +38 front (285/35/22)
22x10.5 +20 rear (285/35/22)

this setup is slightly taller then stock, but I hate the rubberband tire look on trucks.
There is about 1/2" gap from the top of the tire to the control arm on the front. Fits just fine.

Good to know. Ya, I'm with you, the super low profile looks awful on SUVs and trucks