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These are some common tools used to work on this device. You might not need every tool for every procedure.
Background & Identification
The Trek 820 is known to handle the streets better than some of the higher numbered Trek's (i.e. Trek 3700). The Trek 820 is different than the rest because it is Trek's generic bike so almost any tire or seat will work due to the interface of the Trek 820 being up to the industry standard.
Colors: Matte Metallic Black
Frame: Trek Custom Steel w/chromoly seat tube, replaceable derailleur hanger
Front suspension: SR Suntour M-2025 w/coil spring, 63mm travel
Sizes: 13, 16, 18, 19.5, 21”
Wheels: Formula FM21 alloy front hub; FM31 alloy rear hub w/Bontrager 550 36-hole rims
Tires: Bontrager LT3, 26x2.0"
Shifters: Shimano Tourney, 7 speed
Front derailleur: Shimano TX
Rear derailleur: Shimano TX35
Crank: Forged alloy 3 piece, 48/38/28
Cassette: Shimano TZ31 14-34, 7 speed
Pedals: Wellgo nylon platform
Saddle: Bontrager SSR
Seatpost: Bontrager SSR, 31.6mm, 20mm offset
Handlebar: Bontrager Riser, 25.4mm, 30mm rise
Stem: Bontrager Forged, 25.4mm
Headset: 1-1/8" threadless
Brakeset: Tektro linear-pull brakes w/Shimano Tourney levers
Grips: Bontrager SSR
Extras: Rack & fender mounts