rim offset?

[Madpol]

ok this is probably a really nub question but what is off set on rims?
this is a subject i have never really looked at before

and what sort of off set do i want for deep dish rims?
it says my current ones are 40,45 offset

[illinois_erik]

ok this is probably a really nub question but what is off set on rims?
this is a subject i have never really looked at before

and what sort of off set do i want for deep dish rims?
it says my current ones are 40,45 offset

http://www.cb7tuner.com/vbb/search.php<-click there and search away.....or

http://lmgtfy.com/?q=definition+of+wheel+offset

[Domesticated]

7" wheel with 45 offset is 177.8mm wide (25.4*7) and sticks 43.9mm (177.8/2 - 45)outward from the hub and 133.9mm (177.8/2 + 45) inward. If you want an 8" wheel with an offset of 30 it would have 71.6mm outward (25.4*8/2 - 30) and 131.6mm (25.4*8/2 + 30) inward from the hub. So it sticks out 1.09" [(71.6 - 43.9)/25.4] further and has 0.09" of clearance on the inside. You can reverse equations to figure out what kind of offset you need for specific dimensions.