Crud! I just discovered that my Arcee is miss assembled. Take a look at this pic. That is how arcee is supposed to be assembled in the package.: Now here is how mine was assembled. Notice the rear wheel rim is different looking than in the 1st pic: As a result of the miss assembly, the tire halfs don't fit together, because the pegs are on the wrong sides. Also the inner parts of the rims don't connect properly either. They are lopsided. This is how the robot mode should look, with two different rims: And here is mine, with 2 of the same rims: Since the rims are identical, they cannot connect and make a flush rear tire in bike mode. Looks like I will need to exchange it. But when I do exchange it, I'll look in the package and make sure the rear rim looks like it does in the 1st pic. So make sure your rear rim looks like the 1st pic before you buy her!