Wheel backspace and size

[bigblockchevelleman]

First off I would like to say thank you for the help Steve  ,I'm in the final stages of a complete rebuild and a two year job with having suffered health issues and loss of family members Thank you everyone who has helped me  . Ok my question I'm trying to figure backspace  , offset of wheels so that no spacer is required I've lowered the truck slightly with shackles and hangers in the rear and drop spindles using in the front  , wanting to go with either 17,18 Not crazy about 20s I like the American racing salt flats  THANKS for any help Steve

[JohnnyPopper]

First, I'm not Steve, or Lisa...

You have to start with the basics of what you have to work with.

Enclosed is a diagram of such.

Disclaimer to those who flame- pls let's all go lay down by our bowl.

FYI Front will differ from rear fender well due to turning radius but same principles apply from a baseline measurment of A, B, C, and D.

With the same measuring points you can get the data you need.

Your NEXT task is to get measurements from the wheels/tires you desire AND measure those against the space/travel you have.

It's easier than you think! You got this man!!!

[Scott91370]

I'm running the US Mags Rambler with a 4" back space (or 1mm offset) and a 245/45-17 tire. Tons of room and I have 2.5" spindles and 2" springs.
I also have a 1.5" or 2" spacer to bring the wheels out and I do not have any rubbing issues.
So essentially I could run a 1.5" back space (40mm offset) to get the same position with these tires and have no problems.

Remember, it's not just the size of the wheel but height/width of the tire.