Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
GT
2018 GT Avalanche Comp
Previous used estimate
$199 - $205
Actual value depends on condition, size, and local demand.
Value Guide market data · 2018 GT Avalanche Comp
12-month projected trend
7%
Direction and magnitude, not judgment
vs. category average
4%
Drops faster than category avg
Price over time - 2018 GT Avalanche Comp
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Avalanche model years
2024$741 - $763▲ 272% vs. 2018
2022$573 - $589▲ 188% vs. 2018
2021$395 - $407▲ 99% vs. 2018
2020$283 - $291▲ 42% vs. 2018
2019$241 - $248▲ 21% vs. 20182018$199 - $205Currently viewing
2016$201 - $206▲ 1% vs. 2018
2015$207 - $213▲ 4% vs. 2018
2014$168 - $173▼ 16% vs. 2018
2013$230 - $237▲ 16% vs. 2018
2012$224 - $230▲ 12% vs. 2018
2011$297 - $306▲ 49% vs. 2018
2010$192 - $197▼ 4% vs. 2018Compare Avalanche Comp models
2 modelsChoose a different build or frame style to see its value.
Overview
About this bike
GT's Avalanche Comp offers high-end geometry and performance with a wallet-friendly price tag. Its aluminum frame and suspension fork keep you on the straight and narrow while soaking up the bumps dotting your path. When the trail gets hilly, you’ve got a huge range of gears—27 of them to be exact—that’ll take you wherever you want to go with the reliable functionality you expect from Shimano. The Avalanche Comp also comes with Shimano hydraulic disc brakes for relentless stopping power, even on long downhill sections when you need to be able to trust your brakes! GT and All Terra kick in handlebar, stem, grips, and saddle to ensure you’re comfortably in control, making it an easy choice to get out and ride.
Specifications
- Subtype
- Cross Country
- Category
- Mountain
- Component Fork
- SR Suntour XCM-HLO w/ 100mm travel, steel stanchions, aluminum legs, post mount disc brake, hydraulic lockout
- Component Hubs
- Alloy disc
- Component Size
- X-Small, Small, Medium, Large, X-Large
- Component Stem
- All Terra 1 1/8" threadless, 4-bolt w/ CNC face plate, 10° rise for 27.5; 5° rise for 29, 31.8mm clamp
- Product Family
- Avalanche
- Component Chain
- KMC Z99
- Component Color
- Blue Silver
- Component Frame
- 6061 T6 aluminum Triple Triangle, replaceable derailleur hanger, zerostack tapered 1 1/8-1.5 head tube, 27.5/29 design
- Component Brakes
- Shimano BR-M315 hydraulic disc, 160mm rotors
- Component Pedals
- GT Slim Line flat nylon
- Component Saddle
- All Terra MTB
- Component Headset
- Integrated sealed bearing, 1-1/8 upper + 1.5 lower
- Component Cassette
- Sunrace CS-M98, 11-36t, 9-speed
- Component Crankset
- All Terra V-401
- Component Shifters
- Shimano Alivio, SL-M4000
- Component Handlebar
- 6061 aluminum riser, 680mm width, 12mm rise, 31.8mm clamp, double butted
- Component Seat Post
- All Terra alloy micro-adjust, 30.9mm
- Component Chainrings
- 44/32/22
- Component Front Tire
- All Terra Cypher, 30tpi X-Small–Small: 27.5 x 2.10 Med–X-Large: 29 x 2.10
- Component Tape Grips
- GT Statement
- Component Wheel Size
- 27.5-inch, 29-inch
- Component Brake Levers
- Shimano
- Component Bottom Bracket
- VP cartridge sealed
- Component Rear Derailleur
- Shimano, Deore, RD-M592-SGS
- Component Front Derailleur
- Shimano Acera, FD-T3000
- Hubs
- Alloy disc
- Crankset
- All Terra V-401
- Pedals
- GT Slim Line flat nylon
- Bottom Bracket
- VP cartridge sealed
- Chain
- KMC Z99
- Saddle
- All Terra MTB
- Handlebar
- 6061 aluminum riser, 680mm width, 12mm rise, 31.8mm clamp, double butted
- Headset
- Integrated sealed bearing, 1-1/8 upper + 1.5 lower
- Front Derailleur
- Shimano Acera, FD-T3000
- Rear Derailleur
- Shimano, Deore, RD-M592-SGS
- Stem
- All Terra 1 1/8" threadless, 4-bolt w/ CNC face plate, 10° rise for 27.5; 5° rise for 29, 31.8mm clamp
- Brake Levers
- Shimano
- Brakes
- Shimano BR-M315 hydraulic disc, 160mm rotors
- Cassette
- Sunrace CS-M98, 11-36t, 9-speed
- Chainrings
- 44/32/22
- Fork
- SR Suntour XCM-HLO w/ 100mm travel, steel stanchions, aluminum legs, post mount disc brake, hydraulic lockout
- Frame
- 6061 T6 aluminum Triple Triangle, replaceable derailleur hanger, zerostack tapered 1 1/8-1.5 head tube, 27.5/29 design
- Seat Post
- All Terra alloy micro-adjust, 30.9mm
- Shifters
- Shimano Alivio, SL-M4000
- Tape/Grips
- GT Statement
- Color
- Blue Silver
- Size
- X-Large
- Wheel Size
- 29-inch
- Front Tire
- All Terra Cypher, 30tpi X-Small–Small: 27.5 x 2.10 Med–X-Large: 29 x 2.10
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Suspension service
Confirm fork and rear shock service intervals and check pivot bearings for play.