Pitlock Seatpost Clamp


Replaces unsuitable clamps with non-parallel clamping surfaces, or surfaces that are too small. These seat clamps are specifically designed to accept Pitlock seatpost skewers.

Seat clamps come in either silver or black, and are available in five sizes sizes: 28.6mm, 30.0mm, 31.8mm, 35.0mm, and 40.0mm.

See below for additional product and sizing specifications.



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.

Additional information

Seat Collar Size

28.6mm, 30.0mm, 31.8mm, 35.0mm, 40.0mm

Seat Collar Color

Silver, Black


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