I seldom get over 25 mph but there's a hill on my commute where on the downhill side, if traffic is clear, sometimes I can. My problem is that I have long feet (US M's 13) and a average length chainstays. My panniers have to be mounted as far back as possible to not make contact with my heels. But sometimes on that downhill, I get the shakes...wish there was a simple solution apart from getting a new bike or cutting my toes off.