Offset Guru's Please
Offset Guru's Please Maybe its not that hard of a question, I just couldnt seem to find the data. I have a rearend thats 2 inches shorter than stock and Im looking for what offset I need for a 17" or 18" wheel with no spacer if possible. Currently using the stock wheels with a 1" spacer.
I agree. A little more info about stock wheel offset's/etc would come in handy. I tried googling it with no luck. So I assume that I could get a pretty dished wheel then with that small of a wheel offset?
Stock wheel offset is 56 mm on Camaro an Firebirds.
If you are running a 1" spacer, then you would subtract 1" from 56 mm leaving you with a new offset of around 30 mm . . .
If you are running a 1" spacer, then you would subtract 1" from 56 mm leaving you with a new offset of around 30 mm . . .
i have my rear shortened 1" per side so same as u and have the same problem.
if you go with a 9.5 wide wheel and a 275 tire, your offset can be as high as ~+40-45. you might be able to go more but it gets riskier.
i have rpm 505 wheels(+38) that are 19x9.5 on vredestein 275/30/19 tires and they fit fine with the bfh. i cut my lca's where they curve to gain more clearance. so for sure a 38mm or less on a 9.5 wheel will work.
my original plan was to run 20x10 rpm 505's that have a +10mm offset but i changed my mind on trying to launch on 20's. so if you're ok with a 20x10, 505's have the offset for you.
if you go above 9.5 wide wheels, it gets troubling.
i like tucked wheels so i'm in the range of +15 to +30mm. hard to find wheels that are 11" wide and have the 0-30mm offset for our cars.
something that might work are the zr1 17x11 +36 offset with maybe a ~1/4" spacer.
i can get my ttm 17X10.5 +44 wheels and sumi 315's to fit but there is work and offset lca's are good to have. i had to do a lot of bfh and trim a chunk off the lca's. it's also centered with adjustable panhard. i used a 6mm spacer to gain more clearance from the lca. it barely clears but enough for daily driving...not too sure about launching hard without the offset lca's.
otherwise offset lca's and a minitub should enable you to run what stock length rear ends are running on here and you'll still be tucking 1" or so of the tire.
let me know what you find.
if you go with a 9.5 wide wheel and a 275 tire, your offset can be as high as ~+40-45. you might be able to go more but it gets riskier.
i have rpm 505 wheels(+38) that are 19x9.5 on vredestein 275/30/19 tires and they fit fine with the bfh. i cut my lca's where they curve to gain more clearance. so for sure a 38mm or less on a 9.5 wheel will work.
my original plan was to run 20x10 rpm 505's that have a +10mm offset but i changed my mind on trying to launch on 20's. so if you're ok with a 20x10, 505's have the offset for you.
if you go above 9.5 wide wheels, it gets troubling.
i like tucked wheels so i'm in the range of +15 to +30mm. hard to find wheels that are 11" wide and have the 0-30mm offset for our cars.
something that might work are the zr1 17x11 +36 offset with maybe a ~1/4" spacer.
i can get my ttm 17X10.5 +44 wheels and sumi 315's to fit but there is work and offset lca's are good to have. i had to do a lot of bfh and trim a chunk off the lca's. it's also centered with adjustable panhard. i used a 6mm spacer to gain more clearance from the lca. it barely clears but enough for daily driving...not too sure about launching hard without the offset lca's.
otherwise offset lca's and a minitub should enable you to run what stock length rear ends are running on here and you'll still be tucking 1" or so of the tire.
let me know what you find.
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I think i found my wheels 
The rears will be 18X9.5 with a 20mm offset and the fronts will be 18X8 with a 35mm offset. Will i have any issues? tires will be 245/45/18 and 275/40/18
The rears will be 18X9.5 with a 20mm offset and the fronts will be 18X8 with a 35mm offset. Will i have any issues? tires will be 245/45/18 and 275/40/18 LS1 Tech Stories
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Im more concered about which wheel will fit up front with the given offset in my other post. I dont mind having a taller tire. helps with ground clearance for the turbo kit 
