SUNLITE RACK MOUNT BICYCLE SEAT POST CLAMP ALLOY 1-3/8 34.9mm 34.9mm seat clamp for seat tubes with outer diameter 33.2 – 35.2mm. Typically used with Seat Post that are between 30.4mm - 31.6mm 30.4mm & 30.8mm & 30.9mm & 31.6mm bicycle seat post.
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