The effect of different offsets

[HarmeshK]

Hi guys!

Just a quick question. Currently on my car I have the following alloy fitments:

FRONT ALLOYS: 8J * 19 ET43
FRONT TYRES: 245/40/19
REARS ALLOYS: 9J * 19 ET 49
REAR TYRES: 275/35/19

I’m looking to replace with the following but unsure on fitment and the effect of the difference in offset/width/tyre combo.

20x10.5 ET25 5x112 PCD
Tyre: 305/30/20
20x9 ET25 5x112 PCD
Tyre: 265/30/20

With a lower offset, my limited knowledge tells me the alloys are pushed out further. So the fronts would be pushed out 18mm and the rears 24mm. Is this right?

The fact the replacement alloys are wider too, would that push them out further still? Rears are 1.5” wider and front are an inch wider.

Is my understanding correct? Never really delved into the world of replacement alloys!

I might be able to accept the ET difference as my current wheels could do with some spacers, but the width difference could blow the whole thing out the water!

Thanks guys

 

[Gazwould]

Will They Fit - Online Wheel and Tyre Fitment Calculator

 

[HarmeshK]

Thanks Gaz. Great site that!

Appears that my front wheels would stick out 30mm more and the rear 43mm with the new setup.

I think 25mm would have been the max I could go in the front and less in the rear - so looks like it’s a no go!

 

[classiccarzone]

Your tyres will poke out too far. Due to an unfortunate incident last week where the local council having slightly widened a country road, but forgot to take away some embedded rocks, I burst two of my tires.

While waiting for their legal side to respond a put on some wheels I had on an s class with an Et of 35. Original ET was 47 on the front and 58 on the rear.
They poke out too far and destroy the sides of the car with dirt and the mirrors have been hit on a few occasions with stone chips.

Yours will be poking out roughly somewhat less than two inches. Too much unless you have wide wheel arches.

 

[grober]

Not to mention you will probably be breaking the law under the Road Vehicle Construction and use act-- section on wheel spray supression.
http://www.legislation.gov.uk/uksi/1986/1078/pdfs/uksi_19861078_en.pdf

 

[Deleted member 6183]

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[Edd1968]

Carlos fandango, now that brings back memories

 

[Edd1968]

Will They Fit - Online Wheel and Tyre Fitment Calculator

I play about with this all the time to check offset fitments tyre sizes etc. Excellent tool