He was soloing near the limit of difficulty for the day -- and with hobnailed boots .
Preuss 's hardest climbs were rated Grade V or about 5.7 - 5.8 YDS .
Preuss was soloing near the limit of difficulty for the day -- and with hobnailed boots .
Preuss 's hardest climbs were rated Grade V or about 5.7 - 5.8 YDS .