How wise would it be to switch out the standard 18/16 in. wheels on a standard TBird for 17 in. front and rear? I really love the look of the TBS, and would appreciate the greater range of tire options with the different size. I'm after a TBS, but I keep seeing regular TBirds around and I'm thinking that I might just modify the standard bike to my more sporting tastes. What are the potential problems here? Anyone made this modification? Is it worth it to purchase after market rims for something like this?