52.4 on a screaming down the wall at Altoona this past summer. 1st time pulling 50+ in a pack. Funny thing was, it felt like no big deal as I was with nine strong riders. 50+ solo causes a lot of shaking and uncertainty. Under race conditions, you barely notice it as you're just trying to hold your position. This was in the Cat 4 race. Rumor has it that the pros were pulling 60+ on the same hill. Yikes!