Add a rack to your frame, even if you don’t have rack mounts. Allows standard rack stays to be bolted directly to the seat collar, for a clean and simple look. Made from lightweight aluminum for durability, with threaded inserts to bolt the stays directly into the seat clamp. - 35mm inner diameter fits all alloy Specialized MTB frame designs with 30.9mm posts and 35mm O.D. seat tubes. - 37mm inner diameter fits all carbon Specialized MTB frame designs with 30.9mm posts and 37mm O.D. seat tubes.
- Aluminum collars feature angled slots. - S-Works 32.6mm standard collar (14mm tall) fits all Specialized road frames with an aluminum outer seat tube sleeve - S-Works 31.8mm standard collar (14mm tall) fits all Specialized road frames with a 31.8mm outer seat tube diameter
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