Dimentions
U Lock Size
Outer dimensions of U lock: 199mm*159mm/7.87inch*6.29inch
Inner dimensions of U lock(usable space): 149mm*95mm/5.9inch*3.74inch
Shackle (including rubber coating) diameter: Varies between 17.8mm/0.70inch -22mm/0.87inch. It's 17.8mm/0.70inch at the U and tapers thicker at the ends.
Shackle (metal only) diameter: 15.2mm/0.6inch
Diameter of crossbar: 31.7mm/1.25 inch