I frequently use the bus racks in the Seattle area as I often don't have time to ride my whole 46 mile round trip commute. Most of the Sportworks bus racks have a dense foam cover over the rack arm to prevent the arm from scratching the bikes, but many of these covers are old and frayed. The arms tend to get a little flobby too with age, allowing the bike to rock a little more on some racks than others. I like the lizard skin or pipe insulation options for protecting the fork.