Depends on the size tire. If you get 40 series tires, your gap will INCREASE, due to the tire having a shorter wall. In case you didn't know, in the tire number code; ie. 225/40R18, the 40 means 40% of the first number, which is tire width in millimeters. This applies to any passenger tire.
So when applying this code, you may get bigger rims which will give you a greater inside diameter on the tire-17" is bigger than 15"- but if you go with a low profile tire like a 40 or 35 series tire, you will have a bigger fender gap than say the stock tires on a 240 base model which are 195/60R15.
Mostly though its all visual. The increased fender gap is more noticable on low profile tires due to the tire becoming smaller and the eye naturally catches the bigger fender gap before it notices the tires. Also just note that when you get bigger rims, you will cause the car to sit higher off the ground. 17" and 18" rims are really noticable, you will also notice you top speed will decrease due to having an increase wheel diameter.
Personally I have 18" and when I got them I hadn't lowered my car, they looked really nice on the car but the front fender gap was HUGE! And my top speed dropped off about 15 mph! Those was mostly attributed to those 18" rims, but a side effect was the increased wind drag I got from the car being higher off the ground! Probably about 2" higher than stock. That makes a huge difference in top speed achievements.
Sorry didn't mean to go into such detail but I think I covered every possible question you might have. Personally on 240s most guys go with 17" or if you have the budget, go with 18" light weight rims. Unfortunately mine aren't light weight so I had to throw in more bolt ons to make up for the power loss at the wheels. Sorry I don't have any company recommendations for you. Someone should though.
Good luck gettin the rims! And be patient when choosing cause once you invest that kind of money, you don't want to be unsatisfied.
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