How to Choose Mountain Bikes
GTÂ Aggressor Expert 27.5" Mountain Bike - 2021
$493.73Compared to $760.00*Save 35%
Every day is a new adventure with the GT Aggressor Expert bike. The most off-road friendly hardtail from GT, it delivers the best in value, versatility and performance to recreational mountain bikers.
Key Details
Wheel Size
27.5 inches
Fork Travel
80 millimeters
Number of Gears
24 gear(s)
- Locking SR Suntour XCM-DS 80 mm front fork transitions smoothly from pavement to trail, absorbing bumps on the driveway or dirt
- 24-speed drivetrain ensures a perfect gear for any grade
- With a slight-rise handlebar and paddle saddle, rolling into the world of mountain biking feels natural and comfortable
- 27.5 x 2.25 in. WTB Ranger Comp tires
- Hydraulic disc brakes with 160/160 mm rotors
- 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 | 6061 T6 aluminum, triple triangle with floating seatstays; forged drop-outs with disc brake mounts; zero stack 1-1/8" head tube |
| Bike Suspension | Front Suspension |
| Fork | SR Suntour XCM-DS, 80 mm, hydraulic lockout and preload, coil |
| Fork Travel | 80 millimeters |
| Crankset | Shimano TY301, 42/34/24T |
| Bottom Bracket | Cartridge, square taper |
| Shifters | Shimano SL-M315, 8-speed |
| Front Derailleur | Shimano TY600 |
| Rear Derailleur | Shimano Tourney |
| Rear Cogs | 12-32T, 8-speed |
| Number of Gears | 24 gear(s) |
| Brake Type | Hydraulic Disc Brake |
| Brakes | Tektro M275 hydraulic disc, 160/160 mm rotors |
| Brake Levers | Tektro M275 hydraulic disc |
| Rims | WTB SX19, 32h |
| Front Hub | Alloy disc, QR |
| Rear Hub | Alloy disc cassette QR, 28h |
| Wheel Size | 27.5 inches |
| Tires | WTB Ranger Comp, 27.5 x 2.25, 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, 8 deg. |
| Seat Post | GT All Terra 2-bolt alloy |
| Saddle | GT MTB |
| Pedals | GT Slim Line flat |
| Headset | Semi-integrated, sealed cartridge |
| Chain | KMC Z8.3, 8-speed |
| Weight | 30 lbs. 14.4 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Unisex |
GT Bikes (212693)
| XS | S | M | |
|---|---|---|---|
| Reach | 37.9 | 40 | 42 |
| Stack | 56.6 | 57.5 | 58.4 |
| Effective Top Tube | 53.2 | 54.9 | 56.9 |
| Seat Tube Center-Top | 38 | 42 | 46 |
| Standover Height | 70.7 | 73.2 | 75.7 |
| Head Tube Length | 11 | 12 | 13 |
| 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 | 107.5 | 109.9 | 112.3 |
| 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.
