Jerome & Elizabeth Moos wrote:
> Unfortunately, the only SL here is SL Speedstream, which I think was their aero tubeset. Like most aero tubesets, it was heavier than the corresponding non-aero tubeset.
I think the "SL" in this context was referring to the "Special Lightweight" 531 tube set, which later morphed into "531 Professional."
John Thompson (firstname.lastname@example.org)
Appleton WI USA