I went for my first long(ish) ride on my new brompton this past weekend and towards the end I noticed the rear rim was bent and needed to be trued. I took it to the shop and they "straightened it as best as humanly possible" but it still isn't ideal, and there is a slight wobble. Should I push for a replacement? I have only ridden the bike about 30 miles total. Would this be covered under warranty?