First of all let me start off by saying I am new to this site, just came across it today.

I have a 2002 Chevy Blazer 4dr :

I would like to find out what size tire and specs I would need for both an 18" and 20" rim.
I want to keep it as close to the factory specs so I dont have to get it reprogrammed.
So if anyone can help me with the exact specs I need to keep stock settings and have no rub would be much appreciated.

I bought some 20s before and had to get rid of them due to the rub I was getting on them, im not sure what the offset or backspacing was due to buying them off of a private seller that didint know. And rim shops cost to much so if I have all the right info as far as what size tires, backspacing, offset etc. ill have a better chance of finding the right rim with out complications.
So again I appreciate any and all help, and thank you in advance.

Also im thinking about doing a 2/3 or 3/4 drop on it sometime in the near future.

 

This is if you have a 2wdwith a3/4 drop
Front-18X8 4.5 BS 245/45R18, 255/45R18, 20x8 4.5 BS 245/40R20 <--biggest you can go on front with 20s and not rub unless you have bags then you can go lower and lift it.
Rear- 18x8 4.5 bs 255/45R18 or 18x9.5 5.5 bs 275/40R18 or 18x10 5.5 bs 285/40R18 or 20X8 4.5 bs 245/40R20, 255/35R20 or 245/35R20 or 20x10 5.5 bs 275/30R20, 275/35R20, 285/30R20
Sorry but thats all I can find

 

Thanks for your help!

 

I have 38 offset (I think)- 18" rims with 255-55-18 tires - Seem to be fitting and working well so far without any problems.

 

ive got 22's with a 2/3 drop and the only rub i have is when turning the steering wheel all the way left /right. im not sure what the offset is on the rims they were recomended by a online dealer name is EJonline its a ebay store and they know there **** if u can get ahold of them:P