FPMSL!!!! I'll fourth that!
so the quick skinny;
Your Rear Tire has/had a nail.
you went to get it fixed.
they (the Tire garage) said your wheel is bent(?)
and in order to try to balance it, the put weights on it.
Now you can't put the rear to the front because of the weights?
That's what I get(when using the Yank translator)