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    1991 Specialized Stumpjumper S Works

The S Works bikes were the "skunk woks" bikes from Specialized.  They were pushing the envelope to make them the best they could with very little regard to price.  As the S works bikes got better each year, the previous S works designs often got passed down to the regular production bikes.  This is getting towards the end of the production for the steel bikes.  This one uses a Suntour XC Pro drive train with a bunch of Specialized designed parts (pedals, cranks, rims, bar/stem, post..).  This one also features the Suntour BEAST front shifting system.  One quarter of the chainrings are hinged which allows the chain to move up and down the rings when the signal is sent by the shifter.  It is somewhat similar to a rail road switch in that it moves the hinged portion of the chain rings up or down to perform the shift.  Not the easiest thing to describe but it makes sense once you see it in operation.

   Click on thumbnails below for larger images:        

Stumpjumper   Stumpjumper   StumpjumperStumpjumper
 
Frame S Works cro-moly
Fork Cro-Moly
Rear Shock NA
Rims Specialized XL 21
Hubs Suntour XC Pro
Spokes Wheelsmith Stainless steel DB
Tires IRC Mythos/Piranha Pro
Pedals Specialized composite
Crank Suntour BEAST
Chain Sachs
Rear Cogs Suntour Power Flo 7 speed
Bottom Bracket Suntour
Front Derailleur Suntour BEAST
Rear Derailleur Suntour XC Pro
Shifters Suntour XC Pro, BEAST front
Handlebars Specialized
Stem Specialized
Headset Specialized alloy
Brake set Dia Compe 987
Brake levers Dia Compe SS-7
Saddle Avocet Spenco Gel Flex M-30
Seat Post Specialized
Colors Metallic Green
Size 20"
Serial #   91 J 2149

 

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