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I am confused on this... am ordering my wheels and tires as soon as I decide on wheels, moto metal 951 or diamo karat 17. from what I understand the 951's sit in, towards the spring and doesn't stick out very far...I tried to look at there offsets and all but I do no understand it....I want the wheel to stick out past the fenders some, but not a whole lot, can anyone help?
I got the measurements for the two I want and the ones I have..I think I got it figures out sort of.... Backspacing is what is getting me now, I understand offset, the ones I have now are 0 offset, and one of the new sets is -12 and the other is -18..that -18 will sit closer in towards the leaf spring then the -12 will..correct?
On Backspace, the higher the number the closer to the spring it is.
0 offset means that the wheels mounting surface is dead center in the middle of the wheel.
Offset varies based on the wheel width. The chart on that link does a pretty good job of showing what offset and backspace are at different widths.
On 99-04 trucks you want to stay around 4.5" Back Space....so if it's a 10" wide you'd want -25mm offset or so, if it's a 12" wider you'd want a -51 offset, etc..
05+ trucks you'd go any where from 4.5" - 5.75" back space depening on how far you wanted them to stick out.
Negative offset: When the back of the bolt pad is closer to the inside of the wheel; when mounting surface is inboard of the rim centerline. Tires stick out.
Positive offset: When the back of the bolt pad is closer to the street side of the wheel; when the mounting surface is outboard of the rim centerline. Tires tuck in.