BrassMinkeyBaubles - I asked the woman in our baby shop about problems with the rear wheels before I bought mine and she told me that she's never had any customers experience problems, though she was told to warn people not to hang shopping off the back of the chair, attach buggy boards, overload the basket etc - basically anything which would put extra weight on the chassis/wheels as it could cause some problems. I'd lean more toward it being considered "wear and tear" but more as a result of improper use.