SPACERS

I HAVE AN 01 S10,I HAVE A SET OF 20'S WITH 6.5 BACKSPACING AND FROM MEASURING A +40MM OFFSET I HAD THEM ON THE TRUCK BUT THEY RUBBED REAR MORE THAN THE FRONT. WOULD 1INCH SPACER CORRECT THIS THE TRUCK IS LOWERED 3 FRONT AND REAR NOT BAGGED

If the wheel doesn't rub but the tire does go with a narrower tire. If the wheel and the tire rub, go with a different wheel with the correct offset and proper wheel width for your vehicle. Spacers are not a very safe option.

IF YOUVE got a + 40mm offset you can run a 1.5in adaptor & they should still tuck, make sure the adaptors are billet & not cast

depending on the spacer, if its thick, longer lug studs may be needed too, so you have enough thread engagement with the lug nuts.

check out this link for adaptors
http://www.excaliburwheel.com/billetadapt.html

I have spacers on my Jetta now, 1/4 inch on the front and 1/2 on the rear...but i never had one that was more than that...I was told that spacers were safer than adapters but i hear everything is unsafe to a point that you do to your car/truck!