IROC RIM SIZES
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Joined: Apr 2007
Posts: 358
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From: Sparta, NJ
Car: 1987 Camaro Z28
Engine: Carbed 355
Transmission: Borg Warner T56
Axle/Gears: 4th gen 10 bolt 3:73 Richmond gears
IROC RIM SIZES
Hey my iroc rims are 16x8 in the front and 16x8x20 in the rear. I am confused at what the x20 means. can anyone tell me what the difference is? they are the first version of the iroc rims.
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Joined: Nov 2009
Posts: 1,255
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From: Lincoln, NE.
Car: '87 IROC
Engine: 5.7 Vortec w/ factory TPI
Transmission: WC T-5
Axle/Gears: 3.45 Posi
Re: IROC RIM SIZES
It has to do with the offset of the rear rims. IROC rims are stamped front and rear and you can run the fronts on the front and rear, but when they are on the rear they will stick out past the rear quarter. If you were to run rear rims on the front they would rub on the inside. That is why you need spacers to run 4th gen wheels on your 3rd gen.
If I am not mistaken the fronts have a 16mm offset and the rear is 20mm, but don't quote me on that.
If I am not mistaken the fronts have a 16mm offset and the rear is 20mm, but don't quote me on that.
Joined: Aug 2006
Posts: 12,805
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: IROC RIM SIZES
no idea what the 20 is. the factory wheel have a zero offset in the front and a 16mm in the rear.
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