Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2018 GT Grade Carbon Expert
Value Guide market data · 2018 GT Grade Carbon Expert
12-month trend
8%
Direction and magnitude, not judgment
vs. category average
8%
Drops faster than category avg
Price over time - 2018 GT Grade Carbon Expert
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Grade model years
2018 Grade Carbon Expert lineup
Overview
About this bike
2018 GT Grade Carbon Expert value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Fork:
- Grade Full Carbon 1 1/8 to 1 1/4" threadless, disc specific
- Fork
- Grade Full Carbon 1 1/8 to 1 1/4" threadless, disc specific
- Frame
- GT EnduRoad carbon frame and fork, disc specific triple triangle with tapered head tube, PFBB30 bottom bracket, removable fender bridge
Drivetrain
- Groupset
- Shimano 105
- Chain:
- KMC X10
- Crank:
- Shimano 105, FC-5800, 52/36 Chainrings
- Bottom Bracket:
- Cartridge sealed
- Front Derailleur:
- Shimano 105, 5800
- Rear Derailleur:
- Shimano 105, 5800 GS Cage
- Shifters:
- Shimano RS505
- Bottom Bracket
- Sealed Cartridge
- Cassette
- Shimano CS-5800 11spd 11-32
- Chain
- KMC X11
- Chainrings
- 50/34
- Crankset
- Shimano 105, FC-5800
- Front Derailleur
- Shimano 105
- Rear Derailleur
- Shimano 105 , 5800 GS cage
- Shifters
- Shimano RS-505
Brakes
- Brake:
- (F) Shimano BR-M365, Hydraulic Disc, W/ 160mm Rotor SM-RT56, (R) Shimano BR-M365, Hydraulic Disc, W/ 160mm Rotor SM-RT56
- Brake Levers:
- Shimano Hydraulic Disc Brake Lever
- Brake Levers
- Shimano RS-505
- Brakes
- Shimano BR-M365, Hydraulic Disc, 160mm rotors
Cockpit
- Handlebar:
- GT Type R flat riser bar, 31.8x640mm
- Stem:
- all new 3D forged GT alloy stem
- Grips:
- GT Dual Density Ergo design
- Headset:
- Integrated sealed bearing
- Saddle:
- WTB Silverado Pro
- Seat Post:
- GT Alloy one bolt seat pillar
- Seat Clamp:
- Collar with bolt type
- Grips
- Velo Cork
- Handlebar
- New GT DropTune Super Light double butted 6061 alloy bar with 16 degree flair
- Headset
- Integrated TH sealed bearing
- Saddle
- WTB Silverado Pro
- Seatpost
- One bolt aluminum
- Stem
- GT Design 3D forged 6061, 4 bolt face plate 7° Rise, 31.8mm Clamp
Wheels & Tires
- Rims:
- Alex ATD470 disc specific road 22mm tall profile
- Tires:
- Schwalbe Spicer, K-guard 700x30c (F/R)
- Spokes:
- Stainless steel 15g
- Front Tire
- WTB Exposure Folding, 700X32c
- Hubs
- Formula Ultralight disc sealed
- Spokes
- 15g stainless steel
Accessories
- Cog Set:
- Shimano CS-5800, 11-32t, 11-speed
- Wheels/Rims
- GT ATD470 disc specific road 22mm tall profile, 28h
Frame sizing
XS4'10"-5'2"
S5'2"-5'6"
M5'6"-5'10"
L5'10"-6'2"
XL6'2"-6'6"
M highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- Varies by size
- Reach
- Varies by size
- Wheelbase
- Varies by size
Industry standard. Sourced from catalog metadata.
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Wheel condition
Inspect rims, hubs, spokes, and bearing play; ask about the tire age and any prior wheel rebuilds.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Carbon inspection
Tap test the frame, fork, seatpost, and bars for cracks; verify no impact damage near dropouts.
Inspection
Brake hoses & cables
Check hydraulic line bleed, cable housing wear, and confirm rotors are within spec.