Backspacing On Stock Gm 20's 2007 Silverado Nbs?

[ballon78]

Whats the back spacing on the factory wheels, i want to buy a 4 inch lift kit but want to retain the stock wheels, so i have the stock track withe, anyone ever fiquare out what the stock one are?

[y2kz71]

+30mm offset

[ballon78]

so whats that in backspacing? The lift companys say 5.5 inch, 6 inch and so on. Whats 30 mm = to

[NathanL]

http://www.gm-trucks.com/forums/index.php?showtopic=69553

 

Half way down that thread.

[y2kz71]

your 20x8.5 factory wheels have approx 6" backspace.