Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2018 GT Speed Series Pro
Value Guide market data · 2018 GT Speed Series Pro
12-month trend
13%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2018 GT Speed Series Pro
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Speed Series model years
2018 Speed Series Pro lineup
Overview
About this bike
2018 GT Speed Series Pro value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Fork:
- BOX "X5" Pro Carbon 20mm Forks
- Fork
- BOX "X5" Pro Carbon 20mm fork
- Frame
- GT Speed Series MK7 Elite Race design, 6061-T6 aluminum, formed and butted tubes, reverse dropouts, BB86
Drivetrain
- Groupset
- 2018 GT Speed Series Pro
- Chain:
- KMC Z610HX
- Crank:
- GT Forged Alloy 2-Piece, 175mm Arms, 24mm Hollow Alloy Spindle, 44T AL CNC Chain Ring, AL Chain Ring Bolts
- Bottom Bracket:
- BB86 Sealed Bearings
- Bottom Bracket
- BB86 sealed bearings
- Chain
- KMC Z610HX
- Chainrings
- 44T CNC aluminum, AL chainring bolts
- Crankset
- GT Forged Alloy 2-Piece, 175mm Arms, 24mm hollow alloy spindle
Brakes
- Brake:
- Rear: Promax Cold Forged Arms w/ 31mm Brake Pad adj, 108mm Arms V-Brake
- Brake Levers:
- Promax V-Point Click Lever AL 2 Finger Lever W/ Reach Adjust
- Brake Levers
- Promax V-Point click lever AL 2 finger lever w/ reach adjust
- Brakes
- Rear: Promax linear pull, 108mm cold forged arms w/ 31mm brake pad adjustment
Cockpit
- Handlebar:
- GT Speed Cr-Mo 8.375"H x 29"W, 8? Back, 4? Up, Taper Cross Bar
- Stem:
- Promax Impact Top Load, 53mm Length
- Grips:
- GT Statement Double Lock-on Grips
- Headset:
- 1-1/8"-1.5" Taper Integrated Design, 45X45 Degree Sealed Bearings
- Saddle:
- BOX Echelon
- Seat Post:
- AL integrated w/ Saddle, 27.2 x 135mm
- Seat Clamp:
- PROMAX 412QX, Aluminum, 31.8mm Quick Release
- Grips
- GT Statement double lock-on
- Handlebar
- GT Speed Cr-Mo, 8.375"H x 29"W, 8° back, 4° up, tapered cross bar
- Headset
- 1-1/8 – 1.5" Tapered integrated design, 45x45 degree sealed bearings
- Saddle
- BOX Echelon
- Seatpost
- AL integrated w/ saddle, 272 x 135mm
- Stem
- Promax Impact top load, 53mm length
Wheels & Tires
- Rims:
- Speed Series Aero Double Wall, 36 Hole (F/R)
- Tires:
- (F) Tioga Power Band 20x1.85" (R) Tioga Power Block 20x1.75"
- Spokes:
- 14G
- Axles
- Front: 20mm thru-axle, Rear: Female w/ 3/8" allen bolts w/ AL washers
- Front Tire
- Tioga, Front: Power Band 20 x 1.85, Rear: Power Block 20 x 1.75
- Hubs
- Front: GT Speed Series Alloy CNC body, sealed bearings, Rear: GT Speed Series, alloy CNC body, 4 Sealed Bearings, 6-pawl 72-point engagement cassette
- Rims
- Speed Series aero double wall, 36h
- Spokes
- 14g
Pedals
- Pedals:
- GT Low Profile FS Platform Design, PP Material, Boron Axle
- Pedals
- GT low profile FS platform design, PP material, Boron steel axle
Accessories
- Extras:
- PROMAX 412QX, Aluminum, 31.8mm Quick Release
- Accessories & Extras
- GT 6061 AL CNC chain tensioners
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.