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Crochet vs hook-bead rims
So I learned (?) something new (?) today reading Lennard Zinn's column
at Velonews: https://www.velonews.com/2020/01/tec...blowoff_503717 What I learned was the term "crochet-type rim". Looking it up, some sources say this is just another name for hook-bead, BUT: https://en.wikipedia.org/wiki/ISO_5775#Rims says: Both crochet (C) and hooked-bead (HB) rims have inner profiles that curve inwards near the outside diameter of the rim to provide a hook that helps retain the tire bead under high pressure. On modern bikes crochet rims are most common and hooked bead rims are rare. The distinction is primarily that hooked-bead rims lack the defined bead seat of straight side and hooked bead rims. The tire is held in position radially by the hook without a bead seat playing a role. Without a bead seat, the primary designation of the diameter in terms of the bead seat is not applicable, and the governing diameter is the OD. Sentence #3 pretty clearly has a typo, but I can't figure out the correction, and I cannot find any images on google that directly compare hooked-bead and crocheted (also sometimes mis-named "crotched"). I suspect the "HB" in the quoted passage above is really referring to an obsolete design, and that the quoted writer would even call the 70's Mavic Mod E "crocheted" rather than "hooked-bead," even though we all called them hooked-bead. Can anyone clear this up with an authoritative source? Mark J. |
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