Tires, wheels, backspacing

Need help with exact specs for lug pattern for wheels, got a decent deal on rims online, just want to make sure fits when I get it, I have a base hummer, wheel specs I believe is: Bolt Pattern: 6x5.5 139.7, now do backspacing, and offset need to be specific to fit, wheel I'm looking at is

Size: 18" x 9"

Bolt Pattern: 6x5.5

Offset: +18mm

Backspacing: 5.75

Would this fit on my truck? Would suck if I ordered this wheels and they didnt fit, so any help would be appreciated, Thanks

the place you are buying from should have these specs for you, if they don't know for sure you may want to try elsewhere. I've always had good luck with discounttiredirect.com they know if it will fit or not and have good prices and free shipping.

I can also recommend Tire Rack, great service. Leave it up to them to give you the correct wheel and tire combination or send it back.

Thanks for the advice, I'll go check out americas tire tommorow and see what they have to say.