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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. Gave it a good clean, shifters needed a total rebuild, and the shifter cables were rusted in exposed areas so I replaced those too.

1991 GT Timberline review

She's a little hefty with that plain gauge tubing, but nicely compliant and sturdy once you're going. A great "slow bike".

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 = Timberline)

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°?, 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