GT Aggressor Expert Mountain Bike 27.5 Inch Slate Blue (2019)

Now $579.00 RRP $649.00 SAVE $70.00
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5% Price Beat Guarantee | We'll beat any price by 5%

Our 5% Best Price Guarantee is our commitment that we offer the lowest price. If you find a cheaper price, we will beat it by 5%.

  • Applies to any cheaper price found on any online store in Australia, or in a physical store within Australia.
  • Applies when the competitor's final price inclusive of any taxes and delivery fees.
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We'll build your bike for free when you click and collect at any 99 Bikes store.

First Free Service

First Free Service
Every bike come with a complimentary free service and safety check.

Please Note: GT is not available in our ACT stores.

The GT Aggressor Expert is an extremely versatile 27.5 inch hardtail mountain bike that is built to take you from the town to the trails. The Aggressor Expert brings capable handling and comfortable, confidence-inspiring performance to the table in a single package. The 6061-T6 Aluminum Triple Triangle™ Frame w/ replaceable derailleur hanger is the basis for the durability and reliable performance the Aggressor Expert offers. The trusty frame is powered by a 24-speed Shimano Drivetrain, with enough range to help you up the steepest ascents and descents. The SR Suntour XCM fork with 80mm travel will help you tackle the bumps and then when you’re flying downhill you’ll need some assistance to stop. This is where the Tektro mechanical disc brakes will give you reliable stopping power regardless of the conditions.

The GT Aggressor Expert is an entry-level hardtail mountain bike that can help you commute on weekdays and hit the trails on the weekends, you really can do what you like. The Aggressor Expert is a reliable mountain bike that gives you everything you need to get started at an affordable price.


  • SR Suntour XCM-DS, Hydraulic lockout

  • Shimano Easy Fire Shifters, 3x8 / Shimano Hydraulic Disc brakes

  • 6061-T6 Aluminum Triple Triangle™ Frame

  • WTB SX19 Double wall Disc rims / WTB Transition 2.25"" tires

More Information
Bottom Bracket Cartridge Sealed
Brake Levers Shimano disc
Cassette Shimano Acera, 12-32, 8-speed
Chain KMC Z72, 8-speed
Crankset All Terra, 42/34/24
Derailleur Front Shimano Tourney, 31.8 clamp
Derailleur Rear Shimano Altus
Fork SR Suntour XCM-DS, 80mm, hydraulic lockout and preload, Coil
Frame 6061-T6 Aluminum Triple Triangle™ Frame, w/ Replaceable Derailleur Hanger, and 1 1/8" Head Tube, 27.5 Design
Grips GT Statement logo grips
Handlebar GT All Terra Alloy Riser, 25mm rise, 8° sweep, 6° rise, 700mm
Headset Semi Integrated, Sealed cartridge
Hubs Formula QR front and rear
Pedals GT Slim Line Flat Pedal
Rims WTB SX19, 32h, Double wall, disc
SKU 19GTAggressorExpert27.5SlateBlue
Saddle GT MTB
Seatpost Alloy Micro Adjust, 15mm setback, 27.2 x 350mm
Shifters Shimano Altus SLM-310, 3x8
Shipping Weight 0.0000
Spokes Stainless Steel, 14g
Stem Alloy 1 1/8” Threadless, 4-Bolt W/ CNC Face Plate, 31.8, 8°
Tyres WTB Transition, 27.5 x 2.25"
Delivery Options Click & Collect
Gender Mens, Unisex
Wheel Size 27.5" (650b)
Frame Material Alloy
Groupset Brand Shimano
Chainset Type Triple
Brake Type Hydraulic Disc Brake
Fork Brand Suntour
Fork Material Alloy
Front Travel <100mm
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About GT Bicycles

GT'S story is simple: speed, speed and even more speed. From GT’s namesake Gary Turner designing one of the first BMX race bikes in 1972 to the modern carbon fiber creations that redefine fast-as-hell, GT has built a long legacy of racing, winning, yet never taking things too seriously.

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GT Hardtail Bike Sizing Chart

Rider's Height (cm)

This is an accurate estimate, and every new bike comes with a free professional bike fit when you click & collect in store, plus all bikes have a 30 day Perfect Ride Guarantee.