No, the width of the stock 245 40 18 sidewall is 98mm. 275 35 18 is 96.25mm. 265 35 18 is 92.75mm. So, therefore 275s are closer to the stock tire diameter.

275s work great on 9.5 I had that setup on my Z (as do most people). We're not talking about huge size differences here. 265 vs 275 is .384".

 

Ok guys, I have a lot of experience with XXR wheels, especially on the X.

Here are a few pictures to give you the best idea you can get for those who have questions.

1. YES you can use stock 18" tires on a 9.75" wheel. Honestly guys, you can put almost any width tire you want on a wheel - whether you are ok with super-stretch or super-bubble is up to you.

2. Each tire manufacturer is (actually quite significantly) different as far as firewall angle and actual tread width goes. For instance, Falken FK452's have a very aggressive angle and the tread width is a lot more narrow than the same size Nitto NT555, yet both are rated the same size. This is because the 245 (or whatever the size is) in 245/35/18 is measured where the tire meets the wheel, not the width of the "pavement touching" tread.

3. For most concave wheels, the safe bet is a minimum of 9.5" and an offset of no more than +20 and you are safe to assume you will not need spacers.

4. Anyone that bashes "cheap" wheels is just bad an managing money. I just bought a turbo, injectors, fuel pump, and full ETS IC kit for what those guys paid for their used Volks. Not bashing high-end wheels, just won't ever see the logic behind spending 5-6 times more for something that doesn't get you any noticeable gains unless you are professionally racing your car. Yes, before XXR, cheap wheels weighed a sh*t-ton, but XXR answered that stigma with a solid F-U to the big boys. I had the wheel shop I got these from weigh them before putting them on - 21.1lbs each. For a daily driver, that is perfect. To get any lighter I would have had to go with something 2-3 times more expensive and not near as sexy.


Here are some pics of my ride through it's evolution (total pun intended) over the last year.


The day I brought her home






A few weeks later when I had H&R springs installed






A month later on Chromium Black XXR 527 18x9.75 +20 with the stock tires










A while later with KW V3's set at various heights with 245/40/18 Falken FK452's

 

It's like all of the XXRs were made for the X. 527s look best to me but can't go wrong with any of them really.

 

so just to confirm with you 530 owners. I'm going to pick up a 18x9.75 +20 set asap. my questions are:

spacers needed?
roll needed?
275s wont rub or should i go 265s? i know brands make a difference but is anyone running a 275 on 530s?

 

^ 530 should fit exactly like 527, so in the brand tire that I bought (nankang) 275 would probably fit without a roll. I bought 265 (no roll)but it looks like 275 would be fine. I I did have to roll, it wold be very mild. No you don't need spacers.

 

where are you guys buying your 527s?

 

The Bay of E.

 

NLmotoring, they have great prices and ship quick.

 

what are you guys using for tpms? Will TPMS rebuild kit work on these wheels?

 

and i am stuck between gold 522 or chrome black 527s, ughhh

 

I've never heard of any wheel shop needing anything special, but honestly I don't know. I've had 3 different cars with TMPS's and custom wheels were never an issue.

 

I had mine installed a discount tire, and the did rebuild kits on each tpms ($7 a piece). Works great.

 

^^ Yeah that. I really should pay more attention to what I'm being charged for.

 

I want to pick up the exact same rims you have. Same color too, but I'm running H&R spacers. I'm worried that it might not be low enough with the XXR =[ what do you think?

 

This thread made me want XXR wheels so i picked them up here are some pics.

SPECS:18X9.75 +20 255/40/R18 (lowered on H&R springs)