GT Aggressor Expert Mountain Bike Slate Blue (2021)

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Free Bike Build
We'll build your bike for free when you click and collect at any 99 Bikes store.

First Free Service

First Free Tune-up
Every bike come with a complimentary free tune-up and safety check.

Please note, due to challenges in the product supply chain, bike specifications are subject to change without notice. Specifications listed below may not match exactly as shown in the photo.

The GT Aggressor Expert is an agile hardtail that will help you ride like an expert from day one. This bike could be your everyday bike to go from the trails to your local bike paths and everywhere in between. I tall starts with then lightweight 6061 alloy frame with floating seat stays which improve comfort so you can spend more time in the saddle and enjoy the Aggressor on longer rides. GT built his bike for off-road use but it's also a capable commuter rolling on the fast WTB Ranger Comp tyres and WTB SX19 rims.

While the SR Suntour XCM-DS fork with 80mm travel can handle some of the rougher trails in relative comfort. But the Tektro M275 Hydraulic Disc Brakes really are the standout on the Aggressor, offering excellent stopping power on any trails and in any conditions. GT equipped this bike with a range of high-quality components, including microSHIFT front and rear derailleurs, shifters and cassette. It all adds up to a reliable recreational mountain bike with components and design that will last for hours of fun on the trails.


  • 6061 T6 Alloy Frame
  • Suntour XCM-DS Fork - 80mm Travel
  • microSHIFT Drivetrain
  • Tektro M275 Hydraulic Disc Brakes
  • WTB Ranger Comp 27.5"x2.25" Tyres
  • Size Split: XS/SM - 27.5", MD,LG,XL- 29"
More Information
SKU 21GTaggressorexpertslateblue
Season 2021
Click & Collect Yes
Wheel Size 29" / 27.5"
Frame Material Alloy
Groupset Brand Shimano
Groupset Shimano Acera
Cassette Type 8 Speed
Fork Brand Suntour
Chainset Type Triple
Brake Type Hydraulic Disc Brake
Front Travel under 100mm
Bottom Bracket Cartridge, Square Taper
Brakes Tektro M275 Hydro Disc, 160/160mm Rotors
Brake Levers Tektro M275 Hydro Disc, 160/160mm Rotors
Cassette Microshift CS-H081 8s, 12-32T
Chain KMC Z8.3, 8-speed
Crankset Prowheel TA-CM68-D 42-34-24T
Derailleur Front Microshift FD-M20
Derailleur Rear Microshift RD-M26L
Fork SR Suntour XCM-DS, 80mm, Hydraulic Lockout and Preload, Coil
Frame GT 6061 T6 Aluminium Frame, Triple Triangle w/ Floating Seat Stays, Forged Drop-outs w/ Disc Brake Mounts, Zero Stack 1 1/8” Head Tube, 27.5/29” Wheels
Grips GT Statement
Handlebar GT All Terra Alloy Riser, 25mm Rise, 8° Sweep, 6° Rise, 720mm Width
Headset Semi-integrated, Sealed Cartridge
Hubs Alloy Disc Cassette QR, 28H
Pedals GT Slim Line Flat Pedal
Rims WTB SX19, 32h
Saddle GT MTB
Seatpost GT All Terra Two Bolt Alloy
Stem GT All Terra, 6061 Alloy, 31.8, 8°
Spokes Stainless Steel, 14g
Shifters Microshift TS38 8s Thum-tap Shifters
Tyres WTB Ranger Comp, 27.5/29 x 2.25", DNA Compound
Speeds 3 x 8
Sizing SKUs LG: GTG28101M10LG, MD: GTG28101M10MD, SM: GTG28101M10S7, XL: GTG28101M10XL, XS: GTG28101M10XS

GT Bikes Aggressor 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.

Hardtail Mountain Bike Geometry Diagram


ST Seat Tube

TT Top Tube

CS Chain Stay Length

HTA Head Tube Angle

STA Seat Tube Angle

BD Bottom bracket Drop

HT Head Tube

FL Fork Length

R Reach

S Stack

WB Wheel Base


Wheel Size 27.5" (650b) 27.5" (650b) 27.5" (650b) 27.5" (650b) 27.5" (650b)
Frame Size XS SM MD LG XL
ST Seat Tube (mm) 380.0 420.0 460.0 500.0 540.0
TT Top Tube (mm) 532.0 549.0 580.0 601.0 624.0
CS Chain Stay Length (mm) 440.0 440.0 445.0 445.0 445.0
HTA Head Tube Angle (°) 68.0 68.0 68.0 68.0 68.0
STA Seat Tube Angle (°) 73.5 73.5 73.5 73.5 73.5
HT Head Tube (mm) 110.0 120.0 130.0 140.0 150.0
R Reach (mm) 379.0 400.0 420.0 440.0 459.0
S Stack (mm) 566.0 575.0 619.0 628.0 638.0
WB Wheel Base (mm) 1075.0 1099.0 1141.0 1165.0 1188.0


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