20” wheel fitment
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Junior Member
Joined: Oct 2019
Posts: 15
Likes: 0
From: Sherwood Park, Alberta, Canada
Car: 1987 Iroc Z
Engine: 5.7
Transmission: 4 speed auto
20” wheel fitment
Hey folks, been digging around but not having much luck. Does anyone know if the wheels listed below will fit an 87 iroc? I can do some modifying to make it work.
Front- 20” x 10” +20mm offset or 5.78” back space
Rear- 20” x 11” +43 offset or 6.69” back space
thanks in advance
Front- 20” x 10” +20mm offset or 5.78” back space
Rear- 20” x 11” +43 offset or 6.69” back space
thanks in advance
Supreme Member




Joined: Sep 1999
Posts: 3,047
Likes: 826
From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: 20” wheel fitment
20s are too big for a thirdgen. The tires will have no sidewall and will look and ride like crap...
Joined: Feb 2001
Posts: 13,777
Likes: 567
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: 20” wheel fitment
They will indeed ride hard as rocks. Those wheels are pretty wide too and will likely stick out past the fender. I will all but guarantee it.
Supreme Member




Joined: Sep 1999
Posts: 3,047
Likes: 826
From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: 20” wheel fitment
People seem to overlook the fact that modern cars with 20s have big wheel arches to accommodate them. There is stlll an appreciable amount of tire sidewall. I think 17s are about the limit for what's practical on a thirdgen...
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