How to Choose Mountain Bikes
GTÂ Aggressor Comp Mountain Bike - 2021
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Explore more of the greatest outdoors with the lightweight GT Aggressor Comp mountain bike, featuring a strong and durable aluminum frame for casual off-road discoveries.
Shop similar productsKey Details
Wheel Size
27.5 inches
Fork Travel
80 millimeters
Number of Gears
21 gear(s)
- Whatever path you choose, the 80 mm Suntour suspension fork absorbs bumps and obstacles for a comfy ride on rough terrain
- Strong and durable aluminum frame features forged dropouts with disc brake mounts
- X Guides keep cables tucked away and tidy
- 21-speed (3 x 7-speed) thumb tap shifting system offers smooth and precise adjustability when pedaling uphill or accelerating on level ground
- Tektro mechanical disc brakes and knobby WTB tires offer consistent control on a variety of terrain in a variety of weather
- 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; zero stack 1-1/8 in. head tube |
| Bike Suspension | Front Suspension |
| Fork | SR Suntour XCT, 80 mm, coil |
| Fork Travel | 80 millimeters |
| Crankset | Prowheel alloy, 42/34/24T |
| Bottom Bracket | Cartridge, square taper |
| Shifters | 39-8, 3 x 7-speed |
| Front Derailleur | microSHIFT FD-M20M |
| Rear Derailleur | microSHIFT RD-M26C |
| Rear Cogs | 14-34T, 7-speed |
| Number of Gears | 21 gear(s) |
| Brake Type | Mechanical Disc Brake |
| Brakes | Tektro Mech Disc Brakes, 160/160 mm Rotors |
| Brake Levers | Tektro Mech Disc Brakes |
| 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, 27.5/29 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 2-bolt alloy |
| Saddle | GT MTB |
| Pedals | GT Slim Line Flat pedal |
| Headset | Semi-integrated, sealed cartridge |
| Chain | KMC Z7, 7-speed |
| Weight | Unavailable |
| Gender | Unisex |
GT Bikes (212694, 212695)
| S | M | L | |
|---|---|---|---|
| Reach | 40 | 42 | 43.9 |
| Stack | 57.5 | 58.4 | 59.4 |
| Seat Tube Center-Top | 42 | 46 | 50 |
| Standover Height | 73.2 | 75.7 | 78.2 |
| Head Tube Length | 12 | 13 | 14 |
| Head Tube Angle (degrees) | 68 | 68 | 68 |
| Seat Tube Angle (degrees) | 73.5 | 73.5 | 73.5 |
| Bottom Bracket Height | 31.5 | 31.5 | 31.5 |
| Wheelbase | 109.9 | 112.3 | 114.6 |
| Chainstay | 44 | 44 | 44 |
| Fork Offset | 4.2 | 4.2 | 4.2 |
Sizing Notes
Measurements are stated in centimeters 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.
