Locking skewers

Pitlock brand skewers - use specially-shaped nut/bolt to protect various parts of one's bicycle Locking skewers replace the existing quick release skewers on a bicycle's wheels and seatpost clamp (quick release skewers enable removal without tools). This reduces the need to lock these parts of the bike since now their removal requires tools. One type of locking skewer uses the same design as a normal quick release skewer, except after clamping the skewer the (keyed) handle may be removed.

Another type of locking skewer uses a uniquely-shaped nut that can only be turned using the matching socket/key, which is typically a wrench-like tool that is small enough to fit on a keychain. Though expensive, locking skewers provide additional security and convenience. Locking wheels with an additional U-Lock or removing the front wheel and locking it to the frame and rear wheel would provide the highest security. A disadvantage is that if the owner loses the special tool then they will not be able to undo the skewer, and will need to obtain a spare tool from the manufacturer. The same type of uniquely-shaped nut used for the locking skewer can also be found for suspension forks, V-brakes, and solid-axle wheels in addition to regular wheels and seatposts. Manufacturers such as Pitlock and Pinhead offer services to supply additional lock nuts to an existing key number registered by the owner. Even though a determined thief could eventually defeat the skewer's lock nut by using a power tool, e.g. by grinding a screwdriver slot into it or simply cutting it off, locking skewers provide convenient protection against theft of bicycle parts in areas where locked bicycles should not be left unattended for long periods of time.