I am looking to get new tires for my 2004 mystichrome cobra first new set sinc ei have bought it . Now i have read many many threads now and i really havnt found the straight answer i am looking for. I will most likely stick to the stock size on the front. My question is what is the maximum size i can go on the back side without changing anything around or modifying any bolts. I just want to be able to buy them, mount them, and burn them off!! I have read something about getting flat top bolts or something to run bigger sizes what blot is that and what size then could i run? I plan on getting nittos as they have done me good with all my other rides. Thank you in advance.