Sorry I'm a confused. Sometimes I'm not the sharpest tool in the shed. What do you mean
"Same as a stock shark rim....I kept the same centerline". Stock C3 wheels are 15X8 with 4" backspacing I believe. Do you have 4" backspacing or the same centerline on a 9.5" rim which would give you maybe 5.5" backspacing? I have offset t-arms and small flares already with stock C3 aluminum wheels on the car now.
Thanks.[/QUOTE]
I simply measured from the flat area on the outside of the rim, that the tire bead would rest against...NOT that little turn out that gets scraped up easy in curb rash....so taking a board cut to length and across the rim I measured to the mounting face inside....on my stock '72 steel wheel I measured 3.5 inches that is what I referred to as the offset...of the RIM...
so on the same spots on my '92 wheels, same technique, I measured 7" .. so with 2.5 inch adapter it nets out at 4.5 inches offset.....
now to keep in mind the rim is 1.5 inches WIDER, so wanting 3/4 inch to each side of that centerline...I subtract 3/4 inch off 4.5 inches and come up with 3.75 inches....close enough.....
I really didn't want the bearing loading to be a problem...You can go much wider to the inside with offset arms, but IF anyone made them 15 years ago, I wasn't aware of them....anyway I feel 275/50 is wide enough with ~10" rubber on the ground...but if you go wider, obviously the sway bar has to be removed, or so highly modded up somehow....to the outside is obviously only the fender to be concerned with....another story...
FYI, just as an aside, when they measure tires for rims in say the Tire Rack site, the engineering drawing shows the wheel offset measures taken to the INSIDE of the rim where the tire bead sits on.....I figger to subtract maybe 1/4 inch for that difference, but long as I was consistent within what I was doing, it made no difference.....:bump::quote:[/QUOTE]
Gotcha.
Thanks. I guess I need to hang a bare wheel and do some measuring.