GT  27.5 Avalanche Sport Mountain Bike - 2021

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Pursue new thrills on dirt trails and gravel paths with the GT 27.5 Avalanche Sport mountain bike. This hardtail is built for the rider that seeks efficiency, versatility and fun off-road.

Features

  • Completely redesigned alloy frame is stable and durable; features Boost 141 forged dropouts with disc brake mounts
  • Floating seatstays provide additional compliance and comfort
  • Internal cable routing allows for a clean look; includes dropper post routing (dropper post not included)
  • Locking 100 mm front fork transitions smoothly from dirt trails to gravel paths
  • Tektro hydraulic disc brakes provide controlled stopping power
  • Closeout
  • Specs and images are subject to change

Imported.

This bike comes with Coast to Coast Support, which includes:
  • 1 year of free adjustments (see more below)
  • In-store bike assembly
  • Pickup in store or curbside
  • Bike experts available at 170+ bike shops
REI Co-op Members get more:
  • 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)
More about our free adjustments:
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

Technical Specs

Item #212692
Best Use

Mountain Biking

Mountain Bike Style

Trail

Frame

GT 6061 T6 aluminum Triple Triangle with floating seatstays; zero stack tapered 1-1/8 to 1.5 in. head tube

Bike Suspension

Front Suspension

Fork

SR Suntour XCT-DS, 100 mm, hydraulic lockout and preload adjust, coil

Fork Travel

100 millimeters

Crankset

Prowheel Alloy, 36/22T

Bottom Bracket

Cartridge, Square Taper

Shifters

39-29T, 9-speed

Front Derailleur

Shimano Altus

Rear Derailleur

microSHIFT RD-M36L

Rear Cogs

11-36T

Number of Gears

18 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

Alloy disc, 100 mm quick-release

Rear Hub

Alloy disc, 141 mm quick-release

Wheel Size

27.5 inches

Tires

WTB Ranger Comp, 27.5 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° Sweep, 6° Rise, 720mm Width

Stem

GT All Terra, 6061 Alloy, 31.8, 8°

Seat Post

GT All-Terra Micro Adjust Alloy Seat Post, 30.9mm

Saddle

GT MTB

Pedals

GT Slim Line Flat Pedal

Headset

Semi-integrated, Sealed Cartridge, Tapered

Chain

KMC Z9, 9-speed

Weight

Unavailable

Gender

Unisex

Size Chart

XSSML
Reach39.340.542.845
Stack57.858.859.760.6
Seat Tube Center-Top35.5384348.5
Standover Height69.871.775.279.1
Head Tube Length9101112
Head Tube Angle (degrees)68.568.568.568.5
Seat Tube Angle (degrees)73737373
Bottom Bracket Height30.230.230.230.2
Wheelbase107.6109.2111.8114.3
Chainstay43.543.543.543.5
Fork Offset4.24.24.24.2

Sizing Notes

Measurements are stated in centimeters unless otherwise indicated.

How we measure bikes

  1. 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.
  2. Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
  3. 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.
  4. 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.
  5. 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.
  6. Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
  7. Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
  8. Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
  9. Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
  10. Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
  11. Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
  12. 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.

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