I could actually take the fat tire off my roaring toyz busa or just order the zx14 fat tire from roaring toyz model bike. Only thing I dont like about them, is they are plastic. Not diecast which pissed me off. I have the exact model gsxr your boy has, and its already some what torn apart because I tried to stretch it, but failed lol. Im just wondering how he got the zip ties so stiff to hold the rear up lol.