I'm waiting for the delivery of 19 inch rims for my gs 400. I went 19.8 in front and 19.9.5 in the the back. I don't want to loose my fuel econ. because I drive 98 miles a day to work. right now i'm doing great. and i'm looking to stay the same with this new wheels. I will like to see if i can get some suggestions from the anyone here. thank you

 

I am running 10's in the rear & drive my lowered GS everyday and i run 275/35 in the rear & 255/35 in the front
and have had no problems

 

http://www.1010tires.com/TireSizeCalculator.asp
Try here.
Mine has 19-8.5 with 235x35 front and 19-9.5 with 245x35 rear. Tire is still stretch to this rims wide. Rob Daddy measures suits better but you have to consider the rims off-set too.

 

just curious why u got 8s in the front, arent oem 8s? (i may be wrong)
amyway, i'm on 245/35's on my fronts and 275/30's on back. GL and post em when u get em!

agree with hectorm, need your offsets and how low you plan as well to help better

 

well i meant 19-8.5 in the front. and yes 19-9.5 in the rear. i just don't want to loose my milage because i drive that far. i mean i use this as a everyday driver. i do have a nother suv but i rather drive the car in the summer and the suv in the winter. thats why i'm asking what size would fit my driving. and you guys are responding with great advise. the car is lowered also. which don't mean a thing on this. but just let you guys know. I drive alot. specially once a month i'm drive up to ontario canada. so that why the gas milage is what i'm looking to save when i go to a bigger rims and tires