Rob - 650B tires are always available at your LBS Elliott Bay Bicycles. Why screw with mailordering them? I've been riding them since 1981, LONG before Rivendell or Velo Orange existed. 650B tubes are just the same as 26 x 1.5 by the way. They are available anywhere.
Stop by and see the best vintage collection around.
regards
Bob Freeman Elliott Bay Bicycles 2116 Western Ave Seattle, WA 98121 206-441-8144 Home of Davidson Handbuilt Bicycles
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