Rim size help!

[BADMOFO]

Im thinking on getting IFORGED DAYTONAS, but I can only get them in 19x10 for the fronts and 19x12 for the rears. Will I lose any performance going from a 19x13 to a 19x12?

 

[Luke@tirerack]

with a narrower wheel you will loose some traction because the tire contact patch will be smaller