speedjunkie

iTrader: (3)

Alright, I see everyone talking about offset but every time I look at wheels (mostly Volks) it seems that all the offset widths are different. Like a +44 for one wheel will measure different than for another wheel with the same offset. I also see people saying that this certain size will fit with this offset and that one won't. My question is this: where are these equations? My mind always changes so the wheels I end up going with might not be these, but I'm looking at going with Volk GTUs, would 18x9 +24 (2.67 inch) up front and 18x10 +12 (3.66 inch) out back be too big an offset? Would it fit? I'm also looking at going with Tanabe Sustec RRs for suspension and lowering it a bit if that makes a difference. I'll probably end up rolling the fenders too. If there is a thread on this already please tell me, I did a search and didn't find anything but maybe I just overlooked it. I'm not sure what size tires to use with this either so that info would help too if anyone has any suggestions.

SpeedKing

iTrader: (4)

Like what? Basically, you need to look at 3 things - width, offset, and tire size. Whether the wheel is 16", 17", or 18" or bigger doesn't matter.

It's too low of an offset, and no they won't fit.

You sure did. There's a TON of this kind of info in the archives. Just recently (within the past couple months), "jimlab" and "gfelber" put up excellent posts on the subject.

18x9: 255/35-18
18x10: 285/30-18

speedjunkie

iTrader: (3)

What I was saying is that when I was looking at the Volk Racing website and looking at two different wheels, the offsets they had for those two, both could be +44 and they'd have two different mm sizes, like one would say 66mm and the other would say 89mm or something like that. That's why I'm wondering how alot of people on here can say that one will fit and another won't. Is there a universal calculation somewhere for our cars that I'm not seeing, some way that everyone but me has been on the same page? I realize that I need to look at those three things (well, I didn't realize that tire size other than the width had anything to do with it), but I'm just curious on what the measurement is from the brake rotor to the fender is, or whatever it is that tells someone that a wheel would be too wide or not, that way I can figure that out for myself. I've seen the thread on official FC wheel fitment, but I never saw one for FDs but I'll look again. I see these Japanese FDs with deep offsets and I'm wondering how their's fit but not ours, I guess they're just running a wheel that's not as wide. Thanks for the info, I'll do a search on jimlab and gfelber's posts then. And thanks for the tire sizes.

7racer

I think that number refers to the lip that you are referring to and their offset disk A, B, or C.

Those "offsets" are really pad height to help you pick a wheel that will clear big break kits. As an example. When I purchased my Volks. I purchased the Disk B to clear the 99 spec calipers.

https://www.rx7club.com/forum/showthread.php?t=389749

speedjunkie

iTrader: (3)

Oh alright cool, thanks. 7racer, I was actually reading your thread a little earlier and got an idea of what I was looking for. I think they threw me off on those pad heights. I'll check out the link to that thread, thanks. Also, I was just looking at some OZ Racing Superleggera III Forged rims, am I crazy?? the 18x8.5 go for $850 each and the 18x9.5 go for $900 each. I must be crazy, but they would look SO good on my bitch.

speedjunkie

iTrader: (3)

OH ok, yeah that was the thread I was reading. My question 7racer, is how you got 5.5 from 10 divided by 2? Haha. Maybe I just wasn't understanding it. Other than that I was studying your calculations and I'm going to use them as a guide, thanks man. What was the +1 for though, was that to correct for any slight off calculations just to be safe, like adding the lip of the tire and stuff like that or what? I just want to make sure I get this right the first time cause I don't have alot of money to waste on mistakes. Because of the Volk website I wasn't aware that +38 offset was 38mm, now I know, thanks.

7racer

if your talking about the rears...than its 10 inchs wide.

so thats where the 10 comes from but you add an inch =11/2=5.5

so for the fronts its a 9 inch wheel 9+1=10/2=5

these where courtesy of jimlabs threads....

7racer

the +1 is to take into account the tire.

I don't think the +38 is referring to 38mm it refers to rim depth....on the very first page on each wheel, Rays defines rim depth as "The depth of rims in the size table denotes the length from flanges to faces of disks"

on Rays website for the Volf SF Winning for example
for 18x9 you can get the rims with the same amount of lip or "rim depth" for different offsets so
the wheels with 49mm of "lip" or "rim depth" you can get a wheel in 18x9 +27, +35, or+48

so some people like extreme lips so for 18x10 in the rear for the SF Winnings, the "deepest dish" lip is 99mm or 3.9 inchs!!!! But the only wheel available is one with an offset of +11 which won't fit our cars.

so if you look at more realistic fitment...+36 is pushing it but gives you a 74mm lip or 2.91 inchs. The next more reasonable size in the 18x10 is the +42 (offset disk c) with a 67mm or 2.64 inch lips. The +42 is a safer fit especially since I wanted to run the car to what Howard Coleman recommended (that is 25inch from ground to top of the fender arch). To do this I knew the wheel had to tuck under the fender....+36 would make it aweful close if not hit the fender...didn't want to take that chance hence the +42 offset that I picked. Also, to me the difference in lip between the two is only .27 inchs! Totally not worth it if I would FUBAR the body work IMO.

rynberg

Yes, you are crazy. For that price, you could go with Fikse's.....

rynberg

No, it's because wheels are typically about 1" wider than their nominal widths. My Enkeis follow this rule perfectly -- they are 9.5 and 10.5" wide (8.5 and 9.5" nominally).

7racer

thanks! I'm still a newb

SpeedKing

iTrader: (4)

And you've got to be crazy to own Fikses. The polished finish is impossible to keep clean, and that's why I sold my wheels! They're more high maintenance than a supermodel!

rynberg

They have painted and anodized options....

speedjunkie

iTrader: (3)

Alright, thanks guys for all your help. My mind changes all the time for what wheels I wanna go with but luckily this is universal knowledge and I'll keep it bookmarked for later reference. Thanks again.