I am no good with rim specs, and im sure one of you are. what does it mean when there is a +40 offset? and if anyone has pictures, could you please post it, thank you.

 

This might help:

http://www.rims-n-tires.com/rt_specs.jsp?postId=906

You can play around with the wheel/tire size and also the specs for each. What is nice is you can set one side to the OEM numbers and then set the other side to what you're looking for and then you'll get a comparison of sizes below it.

 

Offset is the measurement from the mounting face of the wheel (Where it contacts your rotor/drum) to the center line of the rim itself (if you have a seven inch wide wheel, it would be measured to the 3.5 inch mark. By definition, a higher positive offset will move the entire wheel and tire out towards the edge of the fender or even beyond. Typically, people are trying to get the edge of their tires/rims as close to the edge of the fender as possible. Rim width must also be considered closely, because an 8 inch wide rim with a 40mm offset will be 1/2 inch further out than a 7 inch wide rim with the same offset.

One thing that is of interest to note- offset is measured in millimeters. So the difference between a 40mm offset and a 28mm offset is only 15mm or about 1/2 inch. Noticable, but not huge...

If your offset is too large, you may run into problems with the inside of your rim contacting your suspension/brake components. If your offset is too small, you can end up with the "roller-skate" look and run the risk of making tire-to-fender contact.

Currently, I am running a 7-inch wide wheel with 40mm offset, but I plan on spacing out the rears with the 10mm one ton garage rear wheel shims and a 5mm one ton garage rear wheel spacer, effectively giving me 25mm of offset. The fronts will receive just the 5mm wheels spacers. (xBs' rear wheels are about 10mm further from the edge of the fenders than the fronts)

Hope this helps!

 

thanks alot for the help guys