What happened?

Hmmm...maybe the server is down?

Ahh.... Not any more!

I was about to be really disappointed. This is one of the most useful reference threads I've ever seen. Thanks!

Fantastic thread!!
Much easier than the horrible mental picture I always try to make...

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2005 Smart ForTwo CDI
1986 Austin Mini
1986 Fiero GT 5-speed (waiting on a brake upgrade)
2007 Ninja 500

id like to see what a 10 inch wheel with a +30 offset would sit like.

....updated!

Now if only a manufacturer made a 245/45-16 and a 225/50-16...

what is the red line on the left side of the diagram? and the 2 blue lines? Maybe im just retarded. LOL

bump.

The blue line represent the face of the rim of the 1988 15*6 factory front set up for the left blue line and the 1986-88 15*7 factory rear set up for the right blue line. This way it can show the comparison of how far compared to these wheel your offset/wheel of choice will go.

The red line I dont know.... What the red line is for?

[This message has been edited by perry rhodan (edited 02-18-2007).]

Red line is about where the spring perch is on the stock struts...where you may have clearance issues.

[This message has been edited by Joe Torma (edited 02-18-2007).]

so that 10 inch wheel with a +30 offset with the coilover setup would work great.



so do you think that wheel will stick out at all in the back with a 275/30 tire?

[This message has been edited by civicduty13 (edited 02-19-2007).]

Joe, I think something is not quite right. The 10 inch with 30mm offset and the 10 inch with 35mm offset look to be shifted roughly 1 inch from one another. Shouldn't there be about 5mm difference? Please correct me if I am looking at something incorrectly.

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1988 Fiero GT
Cleveland Fiero Club

quote Originally posted by TG oreiF 8891: Joe, I think something is not quite right. The 10 inch with 30mm offset and the 10 inch with 35mm offset look to be shifted roughly 1 inch from one another. Shouldn't there be about 5mm difference? Please correct me if I am looking at something incorrectly.

You're right...I made a mistake on that one! I apologize for the error!!!

10" 30mm with coilovers should still be ok, but I think it'll stick out about 1 1/4".

[This message has been edited by Joe Torma (edited 02-23-2007).]

does this diagram take into consideration the fronts as well?? or is it just for the backs? also, i have another setup lined up. 19 x 8 in the front with a +35 offset and a 19 x 9.5 with a +40 offset. also there is another set with a 19 x 8.5 front with a +35 offset same rear.

also if anyone hasnt noticed, im a wheel freak. I have to have a lot of research done b4 buying any. I want it to be just right and have no setbacks.

[This message has been edited by civicduty13 (edited 02-23-2007).]

Maybe you can help me out. If I wanted the outside edge of the rear tires to be 2" further out, what size wheel & offset would I be looking for? This to fit a rebody with pretty wide flares.

Thanks
David Breeze

Alright I need so help. I am looking at a set of wheels. 17X7 in the front with a 40 offset is fine right? Then the rears come in two ways. 18x7.5 with either a 35 offset or a 45. Which will work and which one will give that deep dish look? Also will a 245 40x18 tire work on a 85 Fiero?

Thanks

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Fiero w/ 1998 Supercharged 3.8 V-6 Intercooled
Best ET: 12.20@ 114.90 mph (street tires)
11.74@115 mph (drag radials)
VIDEO-http://videos.streetfire.net/video/1ecf6afb-a616-4882-b460-cb5602c47869.htm


"NO Juice....Just BOOST!"

What I should have done before I removed the front crossmember today is to take a good measurement where the fender is.
I'll jack it back into place tomorrow to make this chart more useful. Unfortunately I'll only be able to give you pre-88 info! Also, while I researched the stock offsets I don't know if they are 100% correct...if anyone can look and verify it would be great.

Use the chart for front or back, but compare to your current wheel's offset.

245 is pretty wide for 7.5"... I would like to see a photo of that size since i have 7.5 wheels too! I would guess the 35mm would look deeper if they are a multi piece wheel.

[This message has been edited by Joe Torma (edited 02-25-2007).]

MinntgreenGT has 7.5" rim on 255/40's and I too have a 7.5" (42mm offset) rim but, on a 245/35/19 tire w/rear coilovers.

UPDATED! Diagram now includes wheel lip thickness...usually adds 1/4" to each side. Also shows where the fender lip is for pre-88s.

Great info! I will be buying wheels and tires for the #13 as soon as I pick it up from Archie so this information will be very helpful.

Would you add 6" x 48 and 45? I just got Z24 rims and I am not 100% sure of the offset yet but I want a better idea of where the tires will be on the car before I actually get tires and mount the new rims...

Thanks!!

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2005 Smart ForTwo CDI
1986 Austin Mini
1986 Fiero GT 5-speed (waiting on a brake upgrade)
2007 Ninja 500

found another set of wheels. 8 inch with a +40 offset front and 9 inch with a +20 offset rear? please let me see where it would sit. Thanks

bump for new specs???

Updated.

i dont see the 8 inch with the 40 and the 9 inch with the 20 offset on the diagram. Thank you

[This message has been edited by civicduty13 (edited 04-04-2007).]

the 8" was there...but forgot the 9"

thank you. I pretty sure i know what wheels im going with now. Looks like the 9 inch will stick out a lil bit more than the factory wheel but with the overhang of the wheel opening, i think it should be just about right on. Thank you for helping everyone out with this fantastic diagram. It helps a lot.

great work
the only joker is not all tyres are the same side wall shape
some bulge more then others few have real strait sidewalls most curve out some
that only matters if your trying to max the tyres width on a semi-narrow rim for the tyre size

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Question wonder and be wierd
are you kind?

Thanks
You're right about the tires...it's definetely something to keep in mind!
Sorry that the diagram does not show up in the thread anymore. It's under 100k, but dimensionally large.

Thanks for adding my sizes Joe, really appreciate the work you're doing here. Once I get everything bolted up I'll take some shots that hopefully validate some of the more extreme rear wheel sizes people have been requesting!

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Christian Thomas
87 Pontiac Fiero GT Burgandy/Silver 5.7L ZZ4 5spd
301rwhp/345rwtq

Next Mod: 88 suspension, C6 polished wheels, ??? brakes, Konis, poly'd ...AKA NEW CAR!
06 Cobalt SS/SC w/ LSD

A thought . . . Could the width and offset representations for the various combinations that come closest to matching the factory spec.s for flange to footprint ratio be outlined for those wanting to keep close to stock for scrub issues? It would be a help for me, as I neither want to affect
the engineered geometry too much, nor go overboard for asthetics sake! . . . Just a thought

Norm

bobbinn' it to the top for air . . . over!

Can u add a 275/40 tire to a 9 inch wheel diagram to show how they will sit? as for the 9 inch wheel with the +20 offset, it looks like it will stick out about an inch past the fenderwell in the back. Does anyone have pics of something similar to this setup??

bump for the 275 40 tire on a 9 inch rim. would a 7.5 inch rim support a 255 or a 265 40 series tire??

Sorry...feel free to email me if I don't see the thread!



I think 255 is too wide for a 7.5" wheel

[This message has been edited by Joe Torma (edited 05-24-2007).]

How about a 16x6.5 +40. Could be a good replacement for the 88 fronts. Also available in a 16x7. Motegi Trak Lite (12.1 and 12.5 lbs).

Great thread. Thanks for all the info.

Keeping this topic above the rising tide of archivism!

Norm

i have asked this question many time but never got a yes or no answer

do 18x8 front with 38 offset on 225/40/18) and (18x9 back with a 35 offset on 255/35/18 fit on a stock 87 fiero gt ?

how far would they stick out?

would they rub?

Since there's wheel questions being asked, time for a bump

quote Originally posted by 86_fiero_gt_92: i have asked this question many time but never got a yes or no answer do 18x8 front with 38 offset on 225/40/18) and (18x9 back with a 35 offset on 255/35/18 fit on a stock 87 fiero gt ? how far would they stick out? would they rub?

Judging by your interpretation of the results shown in the first image of the first page :
(the one that you need to open, click on the image in the new page to blow it up so it can be read)
1) ???
2) ???
3) ???

I can't speak from experience, that image is the closest and most definitive I've found regarding fitments.

Norm