How to Choose Mountain Bikes
GTÂ Avalanche Comp Mountain Bike - 2021
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Find what makes you happy, ride what sets you free. A well-rounded hardtail, the GT Avalanche Comp mountain bike is ideal for riders looking to fast-track their learning curve and love for pedaling.
Shop similar productsKey Details
Wheel Size
29 inches
Fork Travel
100 millimeters
Number of Gears
10 gear(s)
- Lightweight aluminum frame features the GT Triple Triangle design for precise handling
- Completely redesigned alloy frame features floating seatstays for additional compliance and comfort
- Internal cable routing allows for a clean look
- 100 mm travel fork reduces trail vibration and increases traction control
- 1 x 10-speed drivetrain for smooth, simplified shifting
- Closeout
- NOTE: Specs and images are subject to change based on component availability
Imported.
This bike comes with Coast to Coast Support, which includes:
New bikes go through a normal break-in period, after which they should be readjusted. All bicycles sold at REI include free adjustments for one year after purchase date—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation and chain lubrication. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
View all GT Hardtail Mountain Bikes- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- 20% off shop services
- Free tubes with purchase of flat tire repair (Co-op Cycles brand tubes only; tube must be installed at time of purchase)
New bikes go through a normal break-in period, after which they should be readjusted. All bicycles sold at REI include free adjustments for one year after purchase date—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation and chain lubrication. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
| Best Use | Mountain Biking |
|---|---|
| Mountain Bike Style | Trail |
| Frame | GT 6061 T6 aluminum Triple Triangle with floating seatstays/Internal Cable Routing, Dropper Post Routing/Boost 141 Forged Drop-outs w/ Disc Brake Mounts/Zero Stack Tapered 1 1/8"- 1.5" Head Tube |
| Bike Suspension | Front Suspension |
| Fork | SR Suntour XCM-DS, 100mm, Hydraulic Lockout and Preload adjust, Coil |
| Fork Travel | 100 millimeters |
| Crankset | Prowheel Charm, 32T |
| Bottom Bracket | Cartridge, Square Taper |
| Shifters | microSHIFT M850, 10-speed |
| Rear Derailleur | microSHIFT RD-M6205GM |
| Rear Cogs | 11-42T, 10-speed |
| Number of Gears | 10 gear(s) |
| Brake Type | Hydraulic Disc Brake |
| Brakes | Tektro M275 Hydro Disc, 160/160 mm Rotors |
| Brake Levers | Tektro M275 Hydro Disc |
| Rims | WTB SX19, 32 h |
| Front Hub | Formula,100 mm quick-release |
| Rear Hub | Formula,141 mm quick-release |
| Wheel Size | 29 inches |
| Tires | WTB Ranger Comp, 27.5/29 x 2.25 in., DNA Compound |
| Tire Width | 2.25 inches |
| Handlebar Shape | Riser Bar |
| Handlebar | GT All Terra Alloy riser, 25 mm rise, 8 deg. sweep, 6 deg. rise, 720 mm width |
| Stem | GT All Terra, 6061 alloy, 31.8 mm, 8 deg. |
| Seat Post | GT All-Terra Micro Adjust alloy, 30.9 mm |
| Saddle | GT MTB |
| Pedals | GT Slim Line Flat Pedal |
| Headset | Semi-integrated, Sealed Cartridge, Tapered |
| Chain | KMC X10, 10-speed |
| Weight | Unavailable |
| Gender | Unisex |
GT Bikes (215285, 215286)
| M | L | XL | |
|---|---|---|---|
| Reach | 42.5 | 45 | 47.5 |
| Stack | 63.7 | 64.6 | 65.6 |
| Standover Height | 73 | 76 | 79 |
| Head Tube Length | 11.5 | 12.5 | 13.5 |
| Head Tube Angle (degrees) | 67.5 | 67.5 | 67.5 |
| Seat Tube Angle (degrees) | 74.5 | 74.5 | 74.5 |
| Bottom Bracket Height | 31.4 | 31.4 | 31.4 |
| Wheelbase | 115.3 | 118.2 | 121.1 |
| Chainstay | 44.5 | 44.5 | 44.5 |
Sizing Notes
Measurements are stated in millimeters unless otherwise indicated.
How we measure bikes
- Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
- Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
- Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
- Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
- Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
- Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
- Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
- Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
- Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
- Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
- Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
- Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
