Tenax was either SL or SP, or a mix, based on the size. In that size (21 inch?) it would almost have to be SL. Schwinn in marketing guides and advertisements described Tenax as "Consumer grade SL or SP tubing". In the Prelude, main triangle only and Schwinn only knows what the stays are, but the fork is Tange (hi-ten unlike the Tempo) and I suspect that the stays are Tange as well, but listed as simply 'cromoly'.
About it's pinkness... I ride my magenta and white '87 Super Sport regularly and have no issue with it. Only thing is that my 15 year old daughter decided to have dibs on it
