I'm looking to get some different rims for my baby and all I can find are the same size rims (18" or 19" x 8.5 and 9.5) but not a mix of 18" and 19". My question is will the 19's fit up front and if not will I just have to get a taller tire for the rears if I go with the 18's? I was also wondering if they can put the tire sensors on the new rims or if that's a custom thing. Thanks.