Originally Posted by Raiyn
To prevent taking a core sample of flesh
http://forums.mtbr.com/showthread.php?p=996985
http://www.usacycling.org/forms/USCF_Rulebook.pdf Page 28.
"(d) The handlebar ends shall be solidly plugged and
attachments thereto shall be fashioned in such a way as to
minimize danger without impairing steering."