Neil
Your frame is 92 - it's the same one as those posted in 1st reply by Irh
So it's '92, Performance series (1st down to Racing series, so still top quality)
I don't know about differents in weights (maybe Stumpjumper weight his Pro Racing?) but definitly top racing frames was built of Ritchey or Columbus tubes, Tange was used in frames beeing a bit lower (fex in '93 2 of 3 racings - Comp and Team - had tange tubeset, Ritchey was only in Pro)
Your frame is 92 - it's the same one as those posted in 1st reply by Irh
So it's '92, Performance series (1st down to Racing series, so still top quality)
I don't know about differents in weights (maybe Stumpjumper weight his Pro Racing?) but definitly top racing frames was built of Ritchey or Columbus tubes, Tange was used in frames beeing a bit lower (fex in '93 2 of 3 racings - Comp and Team - had tange tubeset, Ritchey was only in Pro)