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1991 GT Timberline

a large 1991 GT Timberline mountain bike with blue/black paint job stands in front of a garage door. The bike has flat bars, knobby 26" tires, and is in clean shape given it's 35 years old. 1991 GT Mountain Bike Catalog page featuring the Timberline.

An $80 craigslist find, in very clean and mostly original shape from its original owner. Shifters were completely gummed up from age, and the shifter cables were rusted in exposed areas.

1991 GT Timberline Build Specs

Weight: ?lbs, heavy due to straight gauge tubing

Frame: 1991 22" Tange CrMo plain gauge, Blue Fission colorway. Catalog says Ishikata CrMo, this has Tange MTB PG sticker. Serial T9104 A6 0407 (built at the Toyo factory, April 1994 #0407, A6 is some kind of line or production batch code)

Fork: CrMo Full Unicrown

Cockpit

Handlebars: GT flat tapered, 1", 620mm/24.5"

Grips: ATB Foam, black

Stem: GT II CRMo with internal routing, 35? deg, 140mm, threaded to 1"/25.4mm bar

Headset: Sealed Mech, black

Saddle: Serfas (originally GT SuperSoft, black)

Seatpost: 26.4mm?? GT Alloy 300mm

Seat Collar: GT All Terra CrMo QR

Shift/Brake Levers: Shimano 500LX ST-M050 3x7

Pedals: Wellgo alloy (not original)

Brakes

Levers: Shimano Deore DX

Brakes: Shimano 200GS BR-M201 Canti (F), Shimano Exage Mountain BR-452 U-brake (R)

Pads: Shimano ???

Drivetrain

Bottom Bracket: Sealed mech

Chain: UG50 x7

Crankset: Shimano Exage 300LX FC-M300, 175mm, 48/38/28t

Cassette: Shimano (FH-HG50?) 7-speed 12-28t

Front Derailleur: Shimano Exage 400 LX FD-M400 3x

Rear Derailleur: Shimano Exage 400 LX RD-M400 x7

Wheelset

Hubs: Shimano Exage 500 LX QR alloy HB-RM50 (F), FH-RM50 (R)

Rims: Araya VP-20 alloy 26"x1.5 32h silver anodized

Tires: Knobby skinwall 26x1.9" (F/R)

1991 GT Mountain Bike Catalog page featuring the Timberline specs.

Original catalog specs page

Component weights:

Wheelset: ? (F), ? (R)

Frame Geometry (22")

as measured by me

Seat Tube (C-T): 24" (610mm)

Seat Tube (C-C): 22" (560mm)

Top Tube, Actual: 23.25" (590mm)

Top Tube, Effective (C-C): 23" (584mm)

Head Tube Angle: 70º

Seat Tube Angle: 73.5º

Chainstay Length: 16.75" (420mm)

Headtube Length: 7" (178mm)

Bottom Bracket Drop: 2" (51mm)

Bottom Bracket Height: 11.5" (~290mm)

Standover Height: 33" (845mm)

Front Center: 26" (66mm)

Wheelbase: 42.5" (1080mm)

Stack: ??585mm

Reach: ??430mm

Fork Rake: ~45mm