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1986 Stumpjumper Sport


Todo

  • Check if there are lower rear brake mount points
  • Check models of all parts
  • Count sprocket teeth
  • Redo Bottom Bracket
  • Redo/replace freewheel
  • Replace chain
  • Remove dork disc
  • Clean thoroughly
  • Measure seat post
  • Replace seat post
  • Fix click in bottom bracket
  • Adjust derailleurs
  • Tighten stretched new cables
  • Measure tire clearances
  • Front brake service
  • Service pedals
  • Rust prevention frame saver
  • Head tube service

Identification

SN - AS693504

Resources Online

All Wayback-Machined!

Parts

Original - Researched

  • Frame - Cro-Mo Unicrown
  • Frame Fork - Cro-Mo DB
  • Headset - Specialized steel
  • Rear derailleur - Shimano Deore XT
  • Front derailleur - Shimano Deore XT
  • Hubs - Specialized cartrige, bolt-on
  • Rims - Saturae X28
  • Tires - Specialized Crossroads
  • Brakes - Shimano Deore XT canti
  • Brake levers - Shimano Deore XT canti
  • Crank - Specialized Touring 26/36/46
  • Pedals - MKS Grafight
  • Shifter - Shimano Deore XT
  • Bars - Specialized X3 Alloy
  • Freewheel - Shimano Z 5 speed 14/?
  • Shimano M700 shift levers?
  • Stem - Specialized Duralumin MTB-3

Original - Observed

  • Freewheel - Shimano MF-HG20
  • Pedals - Grafight 2000
  • Sugino BMX 44 chainring (likely 110mm)
  • Altura x28 wheels
  • seat post - 27.3 mm "strong Japan" (27.2 seems to be the std)
  • Seat - Specialized Air Gel
  • Body - Cr-Mo double butted tubing
  • Wheels - Innova 47-559 26x1.75
  • Brake levers - Shimano BL-M700

New

  • MF-TZ20 freewheel
  • Jagwire brake pads
  • Jagwire cables and housing
  • Chain
  • Race Face XY seat post

Maintenance Log

  • 2021-10-26 Thorough clean, remove crank bolt dust covers
  • 2021-11-02 Bottom bracket - remove cages, new bearings and lube, clean freewheel
  • 2021-11-09 New chain, new rear brake pads and pull cable, adjust brakes, true wheels (noticed bulge unable to true out)
  • 2021-11-18 All new Jagwire brake and shifter cables and housings. Clean, lube, and adjust both derailleurs
  • 2021-11-29 Replace freewheel with MF-TZ20
  • 2021-12-24 Replace bent seat post with Raceface XY, cleaned out lots of black oil gunk from seat tube, noticed some rust in top tube
  • 2022-01-13 Rebuild headset, replace bearings. Clean, lube, adjust front brakes, new pads and pull cable. Service pedals and replace bearings and lube.
  • 2022-04-27 Thorough clean and lube chain
  • 2022-09-04 Quick clean and lube chain

Dimensions & Specs

Online

ISO

  • 1" x 24 tpi headset thread
  • 1" handlebar/stem clamp diameter
  • 1.375" x 24 TPI bottom bracket thread (left hand on fixed cup)
  • 1.375" x 24 tpi freewheel thread
  • 56 TPI spoke thread
  • 1mm axle thread

Tire Sizing Freewheel Spacing

Observed

  • 125 mm rear wheel spacing
  • 100 mm front wheel spacing
  • 2 mm spokes
  • 28 mm tube between seat and bottom bracket 28 mm top tube
  • 32 mm tube between handlebars and bottom bracket
  • 16-10 mm tapered between seat and back

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