Need help with wheels

[53chevy]

How do i figure out backspaceing? I currently run 39.5X18 tires but now I'm switching to 46.5X15.5, I need rims still and have no clue what kind of backspaceing is needed. Thanks

 

[Avery4jc]

Those 46's gong on this?

Are you hacking the fenders or going higher?

 

[53chevy]

yea there going on that, hacking mostly, and i have a zero rate for the front that i still need to put on from X-mas.