1991 Specialized Stumpjumper S-Works

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:

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