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Old 04-18-16, 06:51 AM
  #10  
T-Mar
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Originally Posted by eschlwc View Post
doesn't "w/o hp" mean hookless?
W/O HP stands for wired-on, high pressure. This means that there are designed only for use with tyre that incorporated a wire bead (as opposed to true clinchers or tubulars) and that they can accommodate high pressure tires. The term high pressure is relative and must be considered in terms of the era. Prior to the development of the narrow (i.e. 1-1/4") rim, most tyre operated with maximum pressures of 60 psi or less. Anything above 60 psi was considered high pressure during this era.
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