I have a 20" folder that folds "exactely on the middle" so that the front and rear axel nuts (quick release) meets exactely. This is not at all good becouse the fold is several cm`s bigger than it would have been if they did not meet like that. I got rid of the plastic cower on the quick release nut and filed down the axel both front and rear to exact lenght and placed the rear quickrelease axel with the locking mechanism on the drive side so it is ok but I think they should not make them like that.