How WIDE a Wheel/ Tire combo can be installed on the rear of an 85 Fiero with Coil Overs, using 16 or 17" wheels ? (While staying inside the wheel lip on top)
I just ordered 18x8.75 rear , several have 9" rear. edit: I should have read the whole post before answering.... I will find out soon how the 8.75 fit vs 9" hoping they do not stick out but a little will not bother me.
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87 GT series 1 3800sc (7.597 @88.53 1.579 60ft) (series II swap in progress) 85GT Northstar/ 4t80e 86GT 3800 n/a My Build
[This message has been edited by jb1 (edited 09-22-2013).]
another Question: will going from 215/60-15 to 255/55-17 (maybe wider)make the rear camber change any ? I'm asking this, wondering , (I May Widen the rear of the car). will moving the rear wheels outward (wider wheels , same back space) have a good/bad effect on alignment/Handling ?
18x8.75 35mm offset. to close to spring seat but shorter spring will fix it, I would say 17x8.75 would be fine with app 1.5 degree of camber wheel set about 1/4 in wheel well at top
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87 GT series 1 3800sc (7.597 @88.53 1.579 60ft) (series II swap in progress) 85GT Northstar/ 4t80e 86GT 3800 n/a My Build
235 is quite narrow for an 8.75" wheel. 245's and 255's fit on an 8" wheel (255 is pushing it a little bit for the width) with 20mm of offset. With my setup there's over an inch between the tire and the threaded sleeve. I run ~ -1.5 camber and the tire tucks inside the fender on bump.
it was same when I used floor jack under the control arm the difference was minimual.. with seeing how close the wheel is to the strut what tire would you suggest? the width of a 235 was around 9" was why I figured it would be best option... but would prefer a 255 or 265 aslong as they would not rub the strut.
one thing the pic doesn't show is there are suspension limiting straps installed so it is not fully extended...but it will probably lay out more when weight is on tire... so yeah I see where that pic is pointless now ------------------
87 GT series 1 3800sc (7.597 @88.53 1.579 60ft) (series II swap in progress) 85GT Northstar/ 4t80e 86GT 3800 n/a My Build
[This message has been edited by jb1 (edited 09-26-2013).]
For shorter sidewall tires (on the Fiero, 17"+ wheels), you want the tire to be 1 to 1.5" wider than the wheel. That can be 2" or more for taller sidewall tires (16" or smaller wheels).
Get the suspension at ride height, make sure your alignment is correct and look at tire clearance 1-2" out from the outer edge of the wheel.
so you are saying once I get alignment correct and and at ride height that there should be more clearance? I was looking at my other car and realized you were very correct on the 235 being way to small, my 245/45 on 8" rim fit exactly like I need on the 8.75, so 255 or 265 should be just right..
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87 GT series 1 3800sc (7.597 @88.53 1.579 60ft) (series II swap in progress) 85GT Northstar/ 4t80e 86GT 3800 n/a My Build
everything is brand new , ball joints tie rod ends bearings struts , app 10, 000 miles on control arm bushings.. I ordered shorter springs and they gave a lot more clearance for the tire
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87 GT series 1 3800sc (7.597 @88.53 1.579 60ft) (series II swap in progress) 85GT Northstar/ 4t80e 86GT 3800 n/a My Build
245/40R18 on 18x9s, 35mm offset fit on my 86 SE with the stock struts in place. It was close but clear. If the alignment is out regarding camber adjustment it can change the clearance between the spring perch and the tire. With the coil overs using 12" springs I ran into clearance trouble with the adjustable coilover spring perch before the car was lowered to the height I wanted, so you may need a shorter coil spring, 10" for example if it's available if you intend to lower the car a good bit. I posted a picture in a thread involving the engine I believe, but can't find it.
[This message has been edited by Joseph Upson (edited 09-30-2013).]