BOLT PATTERN IS 5x4.75 or 5x4 3/4 It is not 5x4.5" I have had my share of S10s. I currently have a 92 that I have old chevy rallye wheels on. And ofcourse they are 5x4.75" All 4 rims are the same with a 4" backspacing and I find no need for spacers on the front. I am however going to put spacers on all the wheels to bring them out about a half inch. The previous reply mentioned 1.5" spacers on the front. 1990 S10 shouldnt need this. I can only imagine he is reffering to the use of some Camaro rims on your S10. I have a 91 Camaro and the front rims have a different offset than the back. I could help you with tire size and rim back spacing too but I dont know what look your going for. Low profile? All terrain?