Alloy Wheel Size (Et)

[natesis200]

Hi guys and gals. I've seen various posts, moreso the generic IS section but specifically after details of the fitment of the 2005 IS250 se 17 inch alloys. I'm looking to upgrade to aftermarket 18's which I know of their fitment sizes and wanted to work out how much better they'll fill the arches width wise compared to standard. Main thing I need to know is the standard ET of the OEM 17's and their width (J)

[Exdee]

17" Stock: 17 x 8J ET45 (all around)

18" Stock: 18x8J ET45 Front and 18 x 8.5J ET55 Rear

[natesis200]

Thanks dude. Wheels I'm looking at are 7.5j front et 45 and 8.5j rear et 48. Reckon I'll need spacers to look better in arches or should be ok?

[steve2006]

With just 3mm difference on the rears the difference from stock is not worth worrying about.

Obviously your choice of tyres will affect the fill of the arch as well as the wheels.

[natesis200]

Well rimstyle are doing 225/40/18 on the front and either the same on the rear or I can have 255/45/18 I think.

[natesis200]

My worry is are they going to be too far into the arch (as in the outside face of the wheel being further in or not)

[steve2006]

Put your present and proposed wheel sizes into the calculator on the link below it will then show how much inner and wheelarch clearance you will have.

http://www.1010tires.com/Tools/Wheel-Offset-Calculator#Results