RACING BIKES
'(<a href="http://www.j-archive.com/media/2008-09-22_DJ_29.wmv">Sarah of the Clue Crew looks over a welder's shoulder at Trek Bicycle Corporation in Waterloo, WI.</a>)  Hydroformed alloys of aluminum used in the <a href="http://www.j-archive.com/media/2008-09-22_DJ_29a.jpg" target="_blank">frame</a> keep the weight down while maintaining this, from the Latin for "stiffness"'
rigidity