Offset Questions?

[bruce2]

Hi guys, pickup this set of 18s" look like those on member 240RB1, Eric's white Q looking really nice.
http://www.ebay.com/itm/271139432917?ss ... 1497.l2649

After putting the numbers together and I am now a little nervous on the fitment. Not planing to lower as everything stays.

The spec in the manual for the OE rims: 15 X 6.5, 5x114.3 mm, 45 mm offset all around, ? ok with ruler
The spec for the z rims:................... 18 x 8 , 5x114.3 mm, 30 mm offset all around, 66.1 mm hub bore

The differential, if I am not wrong, is 0.5(8-6.5)in + (45-30)mm = 1.34 in or 34 mm further out. Is it too much?
I am looking at 3 options of tires size: 245/40-18, 235/45-18 and 225/45-18.

Now, should I be nervous? would it work? plug and play? or looking at some sort of mods?
Your knowledge and wisdom is greatly appreciated.

[Q451990]

http://www.1010tires.com/WheelOffsetCalculator.asp

This computes that the new wheels will extend out an additional 34mm (just like you said), and in only 4mm, so I don't think you'll have much trouble with it as long as you keep the overall diameter of your wheel/tire combo close to stock.

Tire Rack suggests 245/40-18 or 275/35/18...

I'm running 16 x 7 1997 Q wheels with a 40mm offset, so I'm only 3mm addional clearance vs. what you're talking about on the inside - and I don't recall thinking "wow that's close" looking at mine.

Heath

[bruce2]

Thanks Heath for the encouragement.

I test fit the rim on the front as two of them show up today; hope the rest tomorrow.
There is pretty good space between the vertical third link, about 20 mm, on the inside. I jacked up the suspension approximately as much as had on the car, It looks like almost flushes with the fender and it would be for the tires. I hope the tire will not hit the fender going over speed bumps.





I am going to order some 245/45-18 which is 0.68 in taller then the OE. I am looking at this summer tires, Potenza RE760 Sport, and likely to place the order Monday. Please comment and make suggestion before I click on the order button. Thanks.

http://www.tirerack.com/tires/tires.jsp ... mpare1=yes

This looks a little better:
http://www.tirerack.com/tires/tires.jsp ... 2&i1_Qty=4

[maxnix]

18x9 ET 35 will fit perfectly.

[bruce2]

18x9 ET 35 will fit perfectly.

Glad to know this. So I know sure mine will fit. Thanks.

The difference from my 350z rims is 34 mm vs 41.75 mm extension and 4 mm vs 21.75 mm clearance on the inside. So on the inside, the 18x9 ET 35 would have had about 4 or 5 mm clearance from the third link based on visual estimate. But I might have to use same width tires to avoid hitting the fender even if I got the 9" rims because of the extra 7.75 mm extension.