We like nothing more that to hear of people pushing their Brompton Bikes to the limits. The ultimate endurance test has got to be a trip around the world. It pushes all the bike components to the extremes. Its one sure way of making you fix that annoying rattle on your bike, insanity is the only other option. Jon Tringham is currently on such a road trip with a Brompton and a trailor. His last stop was Milan and you can read his full trip report on Small Wheel Big World.