i was wondering if 275/35r18's will fit all the way around on a 18X9 with a 38 offset

 

well, stock tires are 8" wide, with 225 tires. They can fit up to 245 wide tires. Your rim is 9" wide, and 275's are 3cm wider than 245. 1" = about 2.5 cm. So its like fitting 250 wide tires on the stock rim. I should work, but im not 100% sure. I know they fit 9.5's easily.

 

i don't think you can fit that much tire up in the front. what are you going to be using this car for? i think there is someone on this forum who runs 275's front but i still think you are going to get some serious rubbing issues. if this is going to be a daily driver i would avoid going that big on the front. many people fit the 275 rear with offsets of about mid-30's or more so i think you will be fine there

i would also really avoid going with the absolute minimum rim width to fit that tire. unless your pressures are just right i think you are going to wear out the centers of your tread much faster than the edges

just my $.02