Diameter: 30mm

The race grooves are deeper on these bearings for more lateral support for the twisting and multiple forces associated with mountain bike pivots

1x11 and 1x12 drivetrains (including SRAM Eagle) Compatible with all 10

Note: Not all Presta valve cores are removable

PRO Seat Post Clamp - 34.9mm - Black Exclusive Diameter: 30mmQuality bolt up seat post clamps from PRO. Available in different sizes to suit different diameter seat tubes. If you're unsure of what size to get, check your existing clamp to see if the size is printed, or check your owner's manual search online. Note that the size of the seat post isn't an accurate indicator as the size of the seat tube itself can vary between brands models, depending on what type of material is used in the frame.