"After having a bicycle stolen when a thief cut through a 3/8" steel cable like string, I started searching for a better solution. Typical U locks are bulky and heavy so I wanted something different. The Altor Ti lock is very light, less than the weight of a 20oz soda. It folds compactly and will fit in a back pocket of my jersey. A single lock is useful for many situations, but I bought two (you can link them together) so I can secure my frame and both wheels as long as there is a post or secure ring available. The lock is supposed to be indestructible and it is very well made. The joints make it quite versatile (it is diamond shaped like a kite when closed)."