Will larger or wider wheels fit?

[86FieroGT]

I'd like to have larger wheels and tires (increasing the outer wheel diameter to reduce that excess wheel well space) and/or wider tires for more grip. Then I can retire my 15's for winter tires and not worry about mounting and remounting rubber to suit the roads.

BTW, this is for my '86 fastback

How much can I increase the overall outer wheel diameter without having the front wheels rub the inner wheel wells when turning? I can't see going over 3-4" larger. Anything more would be ridiculous - any little pebbles in the tire tread would rub

Does anyone know how much wider I can go stock or with certain larger diameters?

Also, how difficult is it to then correct the speedometer and odometer? Isn't it just a matter of swapping a color-coded gear?

Has anyone done any of these things? Thank you for any input!

-JP

[fierangero]

i would like to know as well, as i have the same car. would 17s fit??

[86FieroGT]

I have no answers yet, but if you just want to size up your wheels' diameter and get lower profile tires (keeping the same outer wheel diameter / "rollout") then check this out:

http://www.venommotorsports.com/libr...calculator.asp

For those who don't want to mess with the calculator, you should be able to go from 205/60r-15 to 215/45-17 tires on 17 inch wheels with zero changes to the speedometer gearing. Also 215/40-18's, 205/35-19's, or 205/30-20's should fit with virtually no error.

[fierangero]

i've read that we cant go much wider than stock due to the control arms/coil spring/strut towers. not sure tho.

[coop8267]

i have 225/70r-14 on my 85 gt it has 14in wheels 225 is about as wide as you can go. never had any clearance problems. i think all fieros came with 195's stock. when you go taller and wider you need to watch on the rears or you will hit the spring pad on the strut.

[fierangero]

no my fiero GT came stock with 205/60/15 in front, 215/60/15 in back.

[coop8267]

maybe just 84's 85's did i dont know what mine came with it had 225's when i got it. the front tires do stick out a liitle more near the ground effects than the rears do because of the nose slanting inward. i think 235's would fit fine on the back but i might need wider wheels for that mine has the factory '85 14" wheels

[coop8267]

oh and if anyone didnt know. the fiero's 14" aluminum wheels are wider than the same lookin wheels on the other pontiacs. the ones on my gt are anyways.

[fierangero]

the stock GT wheels i heard are damn heavy, thats mostly why i wanna get rid of them, besides the fact that they are ugly