Hello guys need help I have 22" wheels with a 5.5 backspace and a +12 offset I want to drop my 04 Silverado crew cab thinking of doing a 2/4 or 4/6 just want to know whats the tires size can u use I've seen some guys run a 305-40-22 tire on both drop iam stuck here so I need some help thanks. ...

 

Here is a tool we recommend to use Tire Dimensions Made Simple - Discount Tire

By measuring from center wheel hub to fender well you can see which drop will work best.