running 245/50-16 Dayton ZR's on the back,and painted my 15" wheels same inset color,the 225/60-15s seem the closest on size,but came with 215/65-15s stock??will my speedo be off much with going from 15 stock to 16 stock??anybody else running this combo??

 

That is an add combo, but in order to keep your speedo happy, just use tyres that have the same, or close, overall height. I would say as long as you don't deviate beyond an inch from where stock height should be you will be close enough for gov't work.

 

Use the calc below to compare the two t see how much your speed differs.
https://www.thirdgen.org/newdesign/t...ulations.shtml

 

I worked out for you that going from the 215/65-15's to 225/60-15's will make your speedo read 2.5% too slow, so at an indicated 60mph you will actually be doing 61.5mph.

Going from 215/65-15's to 245/50-16's gives a reading 1.4% too fast so at 60mph you are actually doing 59.2mph.