I have a 78 Vette and have factory rally's with 255/6015's for the winter tires but want to put some aftermarket 18's on it for the summer but no one can tell me what the maximum offset, maximum backspacing and all the correct specs that I need for such wheels..... I don't want to sound like I'm totally stupid, but when it comes to sizing up the fit, I am clueless.
Can anyone give me any kind of insight on what or where I need to look for some after market wheels that will fit my 78? I am in the dark and sure could use some light shined in on this.
Just for reference, You need a 4 inch backspace. I'm installing 17 inch 4 inch backspace American Racing Torque thrust 2 wheels 8 inches wide. Tires are 255/50/ZR17. The rear are another story. I installed reverse offset trailing arms. So my wheels are American Racing Torque Thrust 2, 18 inch 4.75 offset 9.5 inches wide. Tires are 285/40/ZR18. Both sets of tires are 27 inch diameter.
Most of the wheels that I have liked or looked at have at least a 6 inch or so back space. Those wouldn't work at all then would they? I can find very few, unless i'm just looking on the wrong website. lol
tanks78 said: Most of the wheels that I have liked or looked at have at least a 6 inch or so back space. Those wouldn't work at all then would they? I can find very few, unless i'm just looking on the wrong website. lol
A 6 inch backspace will put your wheel and tire into the frame.
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
And regardless of the backspacing, make sure that the spokes of the new wheels clear your brake calipers. Many wheels will not clear them and many of us learned that by trial and error. You could always use a spacer if that occurs - many not fans of spacers tho...
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I really had a hard time finding the correct offset for the American Racing - Torq Thrust II 15" I wanted.
Most of what I found on ebay or tirerack (or anywhere else) was zero offset of another one (-18mm I think) which would have required a spacer. If you are spending money to replace wheels and tires; don't settle for spacers unless you "really" have to. Keep looking for the size (backspacing) you need without compromise.
The previous owner of my car had spacers that I wanted to get rid of. To correctly clear the caliper; I needed about 3.75" Backspacing. It fits by a hair. Through my month-long research on the web/phone, I only found 2 places that had this offset.
This guy is where I bought them: http://www.westkycustoms.com/
There was also another place in California that does a lot of customs; but couldn`t mount 15" tires for me; so I picked West KY customs. Great price; good communications and about 3 weeks delivery to my door (being in Canada; that`s good!).
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