Pitlock’s locking skewers are designed to work on flat, parallel surfaces. If your bike’s existing seat collar does not have flat surfaces to accept the skewer, you will need to replace the unsuitable clamp with one designed specifically by Pitlock.
The standard-length Pitlock seatpost skewer (33mm) will fit any size Pitlock seatpost clamp/collar.
To replace your existing seat clamp, measure the outside diameter of your seat tube. Have more questions? Check out our additional instructions on how to measure your bike for Pitlocks.
Seat clamps are available in either silver or black, and come in five sizes: 28.6mm, 30.0mm, 31.8mm, 35.0mm, and 40.0mm.