These Grips go on your seat post (uses internal o-rings) and the little lip on your seatpost clamp hangs onto the grip so it stays attached. The 34.9mm clamp works with a 31.6mm seatpost The 31.8mm clamp works with a 27.2mm seatpost.
The most common seatpost diameters for mountain bikes are 30.9mm and 31.6mm, but 27.2mm (usually road) and 34.9mm exist too. Insertion Length The next important step in choosing a correctly sized dropper post is the overall length and insertion length.
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