help buying wheels (size)

hi, im a little confused as per what size wheel i can put on my truck.

wheel sizes are 17 x ___. does it matter what the second number is?

the trd sport is 17 x 7.5

im looking at a wheel that is 17 x8.5 is this going to be a problem?

any info would be great. thanks

 

8.5 is the width of the wheel, in inches. It determines what range of tire sizes you can run.

What's far more important is the offset and/or backspacing of the wheel, and the bolt pattern.

 

You want to be between 8 and 9 with 4.5 inch of backspacing.

 

thanks
so what is the optimum offset/ backspacing . i have some options.

i m going to get a 17 inch wheel and i have 265/70/17 tires that i do not want to change out

 

If you never plan on running 285's, then you can get rims with 4.5 to 5.5" backspacing. The 4.5 will stick out a litte further.

If you want to run 285's some day, get the 4.5" backspacing.

Backspacing is caclualted by using offset and rim width, btw. You can find conversion charts on google.