The "Will These Wheels Fit My FD" Question Eliminator 3000
 

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An XLS File Based on tried and tested setups. The code is based off of the tried and tested 18x10+50 CCW setup with 2.5" coils and Rotary Extreme Trailing arms, and the proven 18x10+42 on all corners with stock springs and trailing arms. The code will adjust according to your wheel widths, offsets trailing arms and coil setup to provide you with setup verification, and or an explanation of why it won't fit referenced to a explanatory diagram. The Eliminator will also automatically convert your wheel into metric and provide you with "true" front/back spacing. Please keep in mind that these numbers are based on extremes so don't try to push your offsets too the limit. To generate more accurate setup verification, I recommend entering your tire width into the Eliminator in place of rim width. I haver included a conversion tool on the right hand side that will convert your metric tire widths into a standard format that is compatible with the Eliminator. Just plug the converted/adjusted nominal tire width measurements into rim width fields and you'll be ready to verify.

We're all tired of the same questions day-after-day. It doesn't get any easier than this. Mods, lease make this a sticky.

Enjoy ;o)
Rob

Please feel free to PM me with recommendations for front wheel limitations with stock springs. I can easily update the Eliminator settings if we find something that works better for us.

Haha! Nice work. :)

-Max

Ty ;o)

Nice spreadsheet, Wanklin. Of course, we'll still see a bunch of "will these fit?" threads, since not everybody wants 18s. Also, you might wish to redo your example picture, which makes backspacing appear unrelated to offset.

TY

It'll do the job for most of the basic questions out there. The difference between 18" spacing and 17" spacing is very minimal since the trailing arm angles are pretty close to perpendicular. Using simple trig we could calculate exactly how much of a difference there is, but I'll save that for another time.

Thanks for the suggestion, it always helps to have a second eye. I'll change the pic when get time.

Eventually the spreadsheet will be able calculate diameter variances and allow you to select flare options etc., but for now I think it will answer 95% of the "will it fit" threads.

thanks,
Rob

The server sucks.

Once I get a chance to download it (probably next week) I'll rehost it.

Nevermind, the server's script wouldn't work with firefox.

I can rehost it for you if you want though.

Will you be willing to upload occassional updates? ;o)

i wish i had excel

Absolutely. You'd just have to send me a PM or something whenever it's updated.

Sounds like a plan ;o) What email address can I send the file to?

Screw Excel...use OpenOffice. It's spreadsheet program will read and write Excel format, and it's free.

Rich

Send it to thephil@kitsunedev.com.

Also, I don't come into this subforum often, so PM me if you have any questions or anything :D

Please check your email ;o)

Done :D

www.kitsunedev.com/stuff/twtwfqe3k

Ty

Not a problem. When I get around to it, I'll stick a hit counter on there too. But as for now, I'm too lazy :D

You're a good man.

nice, it was very helpful.

glad to hear it.

Not exactly accurate. My father and I both run 18x10, 45mm offset, 285 series tires on the back of our stock suspensioned FD's. They fit perfect and according to that excel sheet they don't. But it is a good tool to get you down to the right area.

Did you enter the wheel width or tire width? If you enter the tire width the results will be slightly on the conservative side. I do plan to tweak that in the future, but as you say, it's good enough to get you there for now.

I entered both just to see what it would say. It said too much backspacing on both. But yeah, better to be a little conservative than not.

[q]Using simple trig we could calculate...[/q]

That is great! LoL.

Tim what setup are you running up front?

Are you running stock trailing arms? If so, I will use your feedback to retweak my tolerances for stock springs/ trailing arms.

thanks
Rob

Also if you guys with aftermarket flares start providing me with some fitment info I can look into adding flare features into the "Eliminator."

I'm only running a 245 series tire up front. My father is running a 255. We both have stock trailing arms, 18x8.5" +45 offset.

Fixed ;o)


The tolerances have been adjusted for the rear with stock suspension. Thanks for your input.

I have emailed in the revised file, but it will not be on the server until xthephilx has a chance to post it.

Rob

Updated :D

you are the man

useful tool bump ^

Can anyone give me some advise?
I recently bought a set on new alloys ADR size 18inch 8.5J with offsets 35 & rears 9.5J with offsets 35 & was going to fit 225/40/18 tyres on front & 255/35/18 tyres on rear.
Can anyone tell me if these offset of 35 will fit my car, Mazda RX7 1993 model twin turbo.

The wheels i have on at present are 17inch 8.5JX with Offset 45 on front & 17inch 9.5JX offset 45 on rear.

I'm a little confused as some people say they fit & some say the rears are too wide.

Please help before these arrive.

Dave

No, they won't fit well. Offset is too low. Rolled front fenders will be a requirement. Also, proper fitment to me means more than just fitting inside the fenderwell, it also means maintaining the proper scrub radius/suspension geometry. +35 is too low of an offset for that.

The wheels you have now are damn near perfect fitment. I would stay with them. 17" tires are cheaper too. But if you want to run the ADRs you just bought, I would go with 245/35 fronts, 265/35 rears.

Updated Version:

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posting so i can find this when i get home! excellent!!!

Will it advise you on whether or not your flares look like ass?

hahahahaha, nice thread

Not yet, but I'm working on it :icon_tup:
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question! the front spacing and back spacing... do they always remain constant? i read the example stating only fill in the yellow areas but im just making sure. i was told that the wheels i am looking at 18x9 +35 offset with 255 all around. i was told the front end might rub a little. does the guide a full proof way to check for possible rubbing? can anyone clarify this for me?

No, front/back spacing are a function of width and offset and you'll need to fill in these fields: It's based on proven extremes, but I'm not going to label it fool proof ;o)
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^ yeah yeah yeah i know i acknowledged that the sheet states the yellow boxes to be filled in. yet a respected member here told me that the fronts would rub in the front. yet the chart states the wheels will fit. so im just wondering what the chart exactly means by "fit".

Sorry, I misunderstood your question. There is no guarantee that the fronts won't rub, there are just too many factors that come into play once you allow the wheels to pivot. For example the 18x10 +50 CCW track package rubbed slightly on the front of Nick Y's car, while others with the identicle wheel/tire combination have not experienced rubbing. It's really a matter or ride height, spring rates, suspension variances, the way the the fenders are bolted on etc.

The spreadsheet will get the wheels to fit inside the wheel wells, but the rest is up to the individual owner. I hope that answer was sufficient.

well according to the spreadsheet the wheels will fit. think i should try my luck and stretch to 265 all around :) ? i wish the spreadsheet would let you put in tire size (hint hint). should i just get my fenders rolled or maybe get some aftermarkets with a very slight flare? the point is i want wheels i can rotate around.

Wouldn't work. The actual width of the tire is never what it says on the sidewall.

ok so lets imagine i can either put 265's all around or 255's all around. what do you think the fitment would be with the BFGoodrich KDW2's? any idea what fender rolling costs? i might as well get it done...

Not to mention that nominal widths are dependent on rim width, therefore 285mm tire has a different width on a 9.5" rim than it does on a 10" rim. Manufacturer tire specs, which are easily found on the tirerack website, are based on some "benchmark" rim width, but they are by no means accurate for all rims.

OK great tool and all but I don't have specific wheels in mind, I want the widest front and rear tires I can get with a stock suspension on a 93 base model. I've seen 285 all around but I dont want rub and I dont want to roll my fenders. oh and I don't have $5000 to spend on wheels I want some off the shelf wheels with lots of rubber can anyone help, thanks?

This "Question Eliminator" link doesn't work
 

None of the fitment links on this forum seem to be working.

Yeah it would be nice if this was available again.

Can someone tell me if I can fit these wheels on my 1985 gsl se. The wheels I want to put on are 15x7 et +9.. I plugged it into the configuration table but I don't understand it. Thank you very much in advance.
Marco