You will have to ask them. You obviously want the taller
tire (808 rpm vs 819

I wouldn't do the 819 rpm fronts with an 808 rear. Too
far off IMHO.

If you're doing this for looks, you're not in my area of
expertise... Also note the undercurrent of problems people
have going to 19-inch wheels at all:
Less tire wall means less cushion to protect tires =
more flats and destroyed tires. Also it adds significant
extra shock loads to wheels and all suspension components,
meaning less bushing and shock life, and maybe mounting
point damage. The car was designed for 18-inch wheels,
and the amount of protection/cushioning they can provide.

 

Thanks Joe...I am thinking of changing to 315 rears and wanted the matching fronts...I was also told that my current setup is all wrong but apparently it might not be (depends on which 235s I have!!).
Id love to go back to 18s but my brakes wont clear!!

 

4% isnt correct, 1% is more of a realistic number for tolerance.