Jesuscookies

iTrader: (1)

I have a chance to pick up a very nice set of wheels. They are new, and the shop is assuring me that they will fit.

The specs are:

Front 18 X 9 +37 Offset
Rear 18 X 11 + 47 Offset

I have coilovers, and all fenders have been rolled. Do you think these will fit?

Secondly, I was trying to work out a deal for a tire combo and this is what I was offered.

Front 235 40 18
Rear 275 35 18

Shouldn't I be running something a little larger tire given the wheel size? I was thinking maybe 255 40 18 and 295 35 18 ? would that be a good combination?

Any help greatly appreciated

rynberg

Proper tire sizes would be 255/35 and 295/30.

I have severe doubts about that rear fitment. The fronts will be ok with rolled fenders, as long as you are running a reasonable ride height.

Gene Felber is running a 18x11 +48 offset rear IIRC and I believe he had to cut out the rear fender lip (not just roll it). Do a search (gfelber).

I can't believe that a wheel shop would guarantee those fitments, they are extremely aggressive fitments, and even with rolled fenders, I would be more conservative.

What kind of wheels are these?

Jesuscookies

iTrader: (1)

HRE's They were originally made for a supra.

Yes I am worried about the rear fitment as well. My calculations show about a 1/4 inch too big in the rear. I have coilovers though, and the issue looks to be with the back spacing part, so I am thinking it may work?

rynberg

The backspacing should work with coilovers and aftermarket trailing arms, but there's no doubt you will be VERY close to the suspension. The real problem is you will be sticking out PAST the fender opening. Here are some comments/pictures from Gene on his setup:

https://www.rx7club.com/showthread.p...er#post4245980
https://www.rx7club.com/showthread.p...er#post4146698

EDIT: Something else -- I don't know if they make HREs hubcentric, but if they do, you'll have to have the centerbore machined out to fit on an FD.

Jesuscookies

iTrader: (1)

Yes they are hubcentric. What does that mean?

Also, what is the net effect of going from 40 35's to 35 30's?

rynberg

You need to read through the wheel and tire tech sections at the Tire Rack so you can understand the basics.

The Supra runs a smaller center bore size than the FD. If the HRE wheels are custom made to fit the Supra hubcentrically, then the center bores are too small and will have to be machined out.

As far as tire aspect ratios, you need to read the basics.

Personally, from the info that wheel shop has given you so far, I would take my business elsewhere. It's obvious they a)either don't know **** about FD wheel fitments, or b) are just trying to clear excess inventory and don't CARE. Either way, I would go somewhere else.

Like I said in the other thread yesterday -- a set of wheels selling at a good price isn't a deal if they don't fit properly, they're just wheels selling at a good price that don't fit.

Jesuscookies

iTrader: (1)

I will read the link. Thanks for the suggestion. It looks like the wheels can be made to fit, but the expense to do so makes them not really worth the bargin price. Goddamn I wanted those wheels!!!!!

Oh well off to the tirerack link.

Jesuscookies

iTrader: (1)

I pulled this information from 7racer, and want to make I can use it to determine ANY wheel/combo/size for my FD?

So can I? Is this information correct?

Maximum front spacing, front wheel - 3.5"
Maximum back spacing, front wheel - 7.5"
So for a 9 inch wheel;
10" (wheel width + 1") / 2 = 5"
38mm = 1.5"
Back spacing = 5" + 1.5" = 6.5"
Front spacing = 10" - 6.5" = 3.5" = pretty damn close

if you calculate it out the rears for a 10" wheel and +38;

Maximum front spacing, rear wheel - 4.0"
Maximum back spacing, rear wheel - 7.5"

11" (wheel width + 1") / 2 = 5.5"
38mm = 1.5"
Back spacing = 5.5" + 1.5" = 7.0"
Front spacing = 11" - 7" = 4.0" so its pretty damn close here with 10" and +38!

if you calculated +42
10" (wheel width + 1") / 2 = 5.5"
42mm = 1.7"
Back spacing = 5.5" + 1.7" = 7.2"
Front spacing = 11" - 7.2" = 3.8" so it gives me a little breathing room.

7racer

it should be correct. I got the info about the max front and back spacing from jimlab and scuderia's website (and I think that is for coilovers). So based on that, if you know your offset you can calculated if the wheel would fit.

Also Jimlab did all of the hard work for you in this spreadsheet in this thread (which I thought was made a stickie??)
https://www.rx7club.com/forum/showth...=wheel+fitment

anyways so if you wanted to do the calculations

10" (9"+1)/2=5
37mm = 1.4 inch (you can round it up actually to 1.5)
Backspacing 5+1.4=6.4"
Frontspacing 10-6.4=3.6 so close or maybe a little over...

if you convert 37mm to inches its actually 1.456inchs. I think it will be really close and more than likely will vary depending on the tires you use and how the shoulders are made. If he will let you I think you should get the wheels and put proper size tires on one and mount it and see.

7racer

hey Jesus,

as a point of reference here are my 18x9 +41 with Michelin Pilot Sport 255/35/18

I don't have an alignment yet so the camber is probably off since I lowered the car back down....but you can already see how close the wheel is to the lip. Also, for insurance I rolled the lip.

Jesuscookies

iTrader: (1)

Thanks for the jimlab link, I will check it out. I love the fitment on the rear wheels. of you car. Thanks.

7racer

no problem....

but in regards to those wheels. I'm with rynberg on this. They would most likely not fit, PLUS if they are hubcentric, you would have to get them machined out to fit our FD. It's just not worth the extra cost on top of the possibility that it wouldn't fit.

Also, it makes me wonder why this wheel shop is offering them at "such a great deal"...