17-08-2021

Specialized Stumpjumper Serial Numbers

Specialized Bike Serial Number

    serial number
  • A serial number is a unique number assigned for identification which varies from its successor or predecessor by a fixed discrete integer value.
  • the unique code that identifies your bicycle, also referred to as a frame number.
  • A number showing the position of an item in a series, esp. one printed on paper currency or on a manufactured article for the purposes of identification
  • (SERIAL NUMBERING) The numbering of a printed product in sequential order. Usually for tracking and accountability.
    specialized
  • Highly skilled in a specific field
  • developed or designed for a special activity or function; 'a specialized tool'
  • Requiring or involving detailed and specific knowledge or training
  • Windows Embedded (POSReady) · Windows Preinstallation Environment · Windows Fundamentals for Legacy PCs
    bike
  • bicycle: a wheeled vehicle that has two wheels and is moved by foot pedals
  • motorcycle: a motor vehicle with two wheels and a strong frame
1981 Specialized Sequoia Bottom Bracket
In later models the size of the frame was on one side and a serial number on the other. This was all together. This frame is 47cm. I believe the earlier Konno bikes only had the frame size, the bikes that followed these were made by Miyata & have a M at the beginning of the serial #.
Bottom bracket shell
'1' probably means 1981, and '50' is the serial number? Edit: '50' is the frame size, the '1' I don't know. Apparently the frame is a 1982 model, not a 1981.

For the Specialized Stumpjumper, they tailored every aspect that contributes to final suspension characteristics — kinematics, leverage curves, damping, and spring rates — to work together in harmony to deliver a highly controlled, responsive, and precise ride that handles bump forces like a bike with far more travel. Format is XXXYY-XXXX, where Y is the year the bike was built. Be aware sometimes though as of 2018 that Specialized started staggered launches of bicycles, for example the Stumpjumper, that came out in 2018 and would have a 2018 SKU but is technically a 2019 bike.

1982 Specialized Stumpjumper Sport
Part Diary, Part Technical Manual, Part Tips & Tricks

Specialized Stumpjumper Serial Numbers

For the past few months I have been thinking about getting an 'original' mountain bike. Living in the Bay Area, the birthplace of mountain biking, I think about all the original guys riding around Mt. Tam on the bikes they had pieced together. The Stumpjumper is regarded as the first production mountain bike that was available to the general consumer, so I thought it would be interesting to get one. Forget the 9 speed shifters, the carbon fiber frames, the 6 inches of suspension travel - I wanted to experience the unadulterated seminal ride.

After finding a few on craigslist, I came across one that was my size and all original. So I go check out the bike in El Cerrito, rode it around the block and bought it on May 13, 2008. Putting it in back of the car, I noticed it sure was heavy! The Sport ($500) is the cheaper version of the original Stumpjumper ($750). I'm not really too sure what the exact differences are, the frame and tubing seems to be the same, probably cheaper components. Looking at resources online, the 'original' components on these bikes vary quite a bit, so I really don't know what to think. All I know is that when disassembling the bike, it sure seemed like this is how the bike left the shop.

6/13/2010 - Since the original Avocet Gel saddle cover was torn, I bought a period correct Avocet Racer saddle from eBay. Now it looks much nicer.

9/23/2016 - After sitting in storage for many years, I decided to bring it home and ride it around a bit. Took it for a loop around Water Dog Lake and it rode quite well.

9/28/2016 - Sold the bike today to a really sweet gal in SF. She plan on converting it into a Rivendell inspired townie.

Here are the specs:
Frame: 1982 Specialized Stumpjumper Sport, 19.5' CTC, 20.0' CTT. Serial Number: M2G29395, M2 = 1982. Fully lugged with Special Series Touring Chrome-Moly Tubing with 126mm rear spacing. Silver.
Fork: Specialized Stumpjumper Bi-plane, 1' threaded, Special Series Chrome-Moly Tubing. Silver.
Rims:Araya 26 x 1.75, 36 spoke, 3X lacing. Aluminum with Presta opening.
Hubs: Suntour Sealed Bearing. The axles are 10mm x 1.0mm super fine pitch.
Tires: Kenda 26 x 2.10 gumwalls.
Freewheel: Suntour Perfect 5 speed, 14-30T.
Cranks: Sugino AT, 170mm, 46x36x26. Date code: B-G = 1982-July
Bottom Bracket: Tange, 124mm spindle, square taper.
Front Derailer: Suntour AR.
Rear Derailer: Suntour AR.
Shifters: Suntour Power Shifter, friction.
Headset: Specialized 1' threaded.
Chain: VIA UG.
Handlebar: Specialized Bullmoose handlebar/stem combo, 1' quill, 125mm reach. Chrome-Moly steel, chrome-plated.
Brakes: Manufacture Auvergnoise de Freins et Accessoires pour Cycles (MAFAC) Cyclo-Tandem Cantilever with Kool-Stop Eagle 2 pads.
Levers:Dia-Compe.
Pedal: Forte Campus.
Seatpost: Sakae Ringyo (SR) Laprade, 26.0mm diameter, fluted. Aluminum.
Seatpost Clamp: Suzue, quick-release.
Saddle: Avocet Racer, black.
Waterbottle Cage: Specialized, silver.

Ratio
16
24
46
6.4
4.5
3.0
36
4.4
2.9
26
3.6
2.5
1.7

The bike currently weights 31lbs 15oz as shown. The bike was originally 31lbs 9oz.

Can You Identify A Bike By Serial Number - How To Look Up A Bike

The following are OE parts that I am currently not using:

SPECIALIZED BIKE SERIAL NUMBER - Google Sites

Saddle:Avocet M20 Gelflex.
Pedals: Tioga SR Surefoot III.
Brake Pads: MAFAC.

Specialized Stumpjumper Serial Numbers Lookup