When touring Tasmania on the R20, at one stage after a steam train leg, the R20 felt like a wet noodle. Very unnerving coming down the pass at Queenstown. That evening I found the hinge nut was loose. Happened when we folded the bikes to be put on the tour bus while we went on the train. Even though it is a self-locking nut, it becomes loose when swinging the frame around the hinge. But yeah, other than that, the R20 was as good as the Moulton - no flex, period. Whatever flex there was was in the luggage rack stays.