I have 215's up front, and 225's in back now and need replaced. I see that the 215's I'm wanting (Dunlop SP Sport FM901's, 17", 45 series) and they are $15 each cheaper for the 215's then the 225's, and plus then I'd beable to rotate front to back. Would I really notice a big different with putting all 4 tires the same size? I was also thinking of using 205 on the front for easier steering, because its hard now. What do you think?

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Original Blue 87GT 5spd.
125,000 Miles, Stock 2.8L

Centerforce Dual Friction, H4 Blue headlights, Cleared Taillights, Mr. Mikes Leather, MoMo Carbon Fiber Steering Wheel, Lowered 1.5", Konig Verdict 17" Rims, Power everything, Speed Hut Gauges, Short Shifter.

Some people will tell you that it's fine, that's what they run, and with no problems. And they'd be right. However, if you go to the 215's on the back, you're going to throw your speedometer off even more. Not sure if that's something that's important to you or not, but it's something that I researched quite a bit when I got tires for my wheels...I ended up getting 235/45R17's for the rear of my car...they were the closest in overall diameter to the stock tires that were on my GT. I have 215/45R17's on the front. I wanted to keep the speedometer as accurate as possible.

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Mike...86 GT 4 Speed
"Sucks to be me..."

[This message has been edited by litespd (edited 10-06-2003).]

Get 235/45 on the rear, 215/45 in the front on a 7.5 width rim. All will clear with regular springs and shocks or lowered springs. I have that size on my sig pic.
205 on all fours will look strange, larger will gap in back. For easier sterring, inflate to proper specs.

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or 245s like me

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85GT
Coming Soon:
3800SC
FINALE

It's not as bad on an '87 but I would not recommend same size tires all around. You can play with the aspect ratio and width to get within 2% of th odometer.

Rotating the tires is overrated. They get plenty of rotation every time you drive them

Yeah I have 205 50 16 front and 225 50 16 rear tires with no prob. A tail heavy car needs more rubber in the rear. I wouldn't worry about rotating.

I ran 225/50-16 all around then dropped back to 205 in front, just feels better to me, but no stopwatch to back it up. Would probably push if stuffed hard into a corner, but low speed maneuvering is very quick and sure.
But I feel its my duty to mention that my Fiero is broken at this time due to an error in my judgement while in triple digits.

[This message has been edited by Phaeton (edited 10-06-2003).]

Go with the 215's in front and 225's on the rear . Don't worry about rotateing the tires , that's a bit of automotive " Wisdom " that's overrated .

Galen Smith
Red '85 Sport Coupe
Founder of Suncoast Fiero Club
Florida Fiero Council

To keep your speedo correct just calculate your error percentage.

Go to http://www.fieroshop.com.au/tyrecalculator/

I wouldnt let the whole not being able to rotate your tires make your decision for you. These cars came stock with wider tires on the rear, they were meant to be that way. so at least get 225/45 if not wider. ive got 215/45/17 and 245/40/17 on mine right now and i am very happy with it.

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-88fieroformula

[img]
https://images.fiero.nl/pffimages/mike-sig_2.jpg[/img]

oh yeah...i have the Dunlop SP Sport FM901's! the tread pattern is very cool!

I have 225/50/16 on the front and 245/50/16 on the rear. So far I have been pretty happy with that size. I would always recomend a wider rear tire. It just seems to make the car stick a bit better in the corners.

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85GT 2.9 4spd MSD Everything, Big Cam, No Cat and Nitrous. Nawzz babeee!!!!
http://www.captfiero.com

I just put new 17s on my 88GT. The tires are 215/45/17 and 235/40/17 respectivly. They fit GREAT and there is plenty of room in the back. I probly could have went with 245s on the back. good luck!

quote Originally posted by 88fieroformula: oh yeah...i have the Dunlop SP Sport FM901's! the tread pattern is very cool!

I've got the same tires too... Have no complaints. Some say they're too loud, but I can't hear them. (is that the engine I'm hearing?) The tread pattern is awesome, but snow driving is not recommended. I'm running 225/50-16's all around, and I like it. The larger tires fill the front fender gaps well, I've only had it scrape when I bottomed the suspension out with the wheels turned all the way. Wish I could do something about the rear wheel gap tho.

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[This message has been edited by hallsman (edited 10-10-2003).]

I have two Fieros

One I have all season Radials, 215/60R14's in back and 205/60R14's front with the steering stabilizer. (RPO QPV says original was 215/60R14 all around) Easy to manoever, Great ride, etc.

The other had 225/60R16's all the way around (guy before had the larger wheels on it -- and yes, there was/is speedo error cause original QPU had 215/60R14's) and I had problems in wet or snow, or even gravel.

(and in michigan one of those conditions is ALWAYS available!)

I changed to all season radials in 215/50R16's to get closer to the standard size. It is 'okay' without the stabilizer and still some scrub on turns, but not bad. It still needs the stabilizer.

My experience is that if you have a tire wider than 8" or a tire with a higher than a 40 series profile the "scrub radius" on the front seems to cause a problem and then there is the 'wobbles' at > 50 miles per hour (often increased or caused also by rear alignment offset!!)

I like the uneven setup better, I think.
But some really like the superwide tires and the "filled wheelwell" look.

However, I'm an old fogey and think lowering the cars, etc is as silly as the stupid looking wings, the "pinched turd" backend of the GT's, etc, etc. (yes, I am wearing flame proof clothes, why do you ask? LOL!)

You might really like having more 'tire' on the pavement if you are trying to attract the attention of the local constabulary with you 'flamboyant driving style' !!

The wonderful thing about the Fiero is that it can appeal to so many different people on so many different levels.

I'd vote for all season radials: rears in the same circumference/profile as originally on the car and fronts with a silghtly narrower footprint with perfect alignment and "all the parts".

my 86 Gt has P215/65/R15 Eagle GT +4 all the way around, and i have had zero problems with it but i wish i could get some easier turning up front or get a LOT more traction

I say go 235 on the back. I have 215/45/R17 Front and 235/45/R17 Rear on stock lowered suspension.

[This message has been edited by JacobHaley (edited 10-10-2003).]

You can go with 185's on all 4 corners like me .

My dads car has 225/60R14 on the front and 235/60R14 BF Goodrich Radial T/A's on the back, it looks good, and clears all suspension, on an '84 SE with stock aluminum rims.

225's front 245's rear.. was the best combination i could find for a pre 88

My car is lowered 1.5", and it also not driving in snow, rain, or otherwise crappy conditions, so I don't have to worry about all season's. I was looking at the FM901's, but comparing them to the Yokohama AVS ES100's, and the ES100's show some better ratings. I'm wanting something that hooks up good, but also going to give good tread life. Not something that I'll have to replace in less then a year like the crap brand that was on my car when I bought it. I'm now considering the Goodyear Eagle F1 GS tires for a little bit more and seem to rate a little better then the Yokohama's. I'm going 215 on the front for sure, but I'm undecided between 225, 235, 245 in the back. Probally go with 235's.