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Delivered ready to ride in 10 to 14 days.

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Select the product you are interested in, click delivery, type in your postcode, and select Bike Delivery. If this is not available there is no available stock nearby.

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Once your order is placed we will be in contact with you within 2 hours to confirm your order.

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Bike Build

Your bike will be built up at your local 99 bikes by one of our expert mechanics and safety checked prior to delivery.

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Your bike is delivered to your door by a 99 Bikes expert who will walk you through your new bike and answer any questions you may have.

Next Business Day Delivery

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Delivered before 8pm next business day.

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All orders placed before midnight will be delivered next business day before 8pm.

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Shipping & Delivery Options

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At 99 Bikes, we offer multiple delivery options to suit your needs. Here’s a quick overview:

Click & Collect:
Order online and pick up your item from a nearby store — free and often same-day!

Standard Delivery:
Available for most parts and accessories.
Estimated delivery:

  • Metro: 2–14 business days
  • Regional & Remote: Up to 21 business days

Express Delivery:
Available for most parts and accessories.
Estimated delivery:

  • Metro: 1–6 business days
  • Regional & Remote: Up to 21 business days

Boxed Bike Delivery:
For selected bikes. Delivered boxed to your address and ready to be assembled in 1 - 2 weeks.

Note: Delivery times are an estimate and actual delivery times may vary based on public holidays and peak periods. Bulky items may take longer.
For full details, delivery estimates and more information, please visit our Shipping & Delivery Info page.

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GT Avalanche Sport 27.5 Mountain Bike [Black] (2017)

Out of stock
Only %1 left
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Up to 12 months interest free

Perfect Ride Guarantee
If you don't love it, you can swap it, up to 30 days from purchase!* Learn more Â»

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

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

Please note that, in order to reduce production and delivery times, bike specifications are subject to change by the manufacturer without notice. Please be aware that these changes might not be reflected on product pages and images.

GT Avalanche Sport is an entry level hardtail mountain bike with 27.5 inch wheel size. 27.5 inch wheels have quickly gained popularity amongst as they offer an optimal balance between the reduced rolling resistance that characterises 29ers and the agility and handling of smaller 26 incher wheels. Larger wheels are able to hit obstacles at a lesser angle than smaller wheel sizes, meaning reduced resistance and loss of momentum as the bike hits the the obstacle and continues along the trail. There is also improved traction and stability as the big wheels allow for more tyre tread in contact with the ground.

Avalanche is one of GT's longest standing mountain bike platforms, jam-packed with features designed for taking on the trails. Avalanche Sport is designed for riders looking for a versatile bike that can do anything around town, or take on some light off-road riding. A lightweight aluminium frame makes the bike easy to ride and durable.

Shimano components offer quality shifting performance and reliability. drivetrain offers high performance shifting, while helping to keep the bike affordable. 3x9 drivetrain offers a wide range of gears to give plenty of options for any terrain.

Suntour 100mm forks can be locked out to improve riding efficiency when suspension is not required. Hydraulic disc brakes offer precise control over braking. Overall, GT Avalanche Sport is a versatile bike for riders seeking a bike that can handle a some fun out on the trails.

FEATURES: 

  • SR Suntour XCT-HLO Fork
  • Shimano 3x9 Drivetrain
  • Tektro Hydraulic Disc Brakes

SPECIFICATIONS: 

Sizes: XXS, XS, S, M, L, XL
Frame: All New 6061 T6 Aluminum Frame, w/ Triple Triangle?, Replaceable Derailleur Hanger, Disc Brake Mounts, and Zerostack tapered Head Tube, 27.5 Design
Fork: SR Suntour XCT-HLO w/ 100mm Travel, Steel Stanchions, Aluminum Leg, Post Mount Disc Brake, Hydraulic Lockout, QR, For 27.5
Rear Shock: N/A
Chain: KMC Z99
Crankset Chainwheel: 15
Crank: All-Terra V-401, 44/32/22T
Crank Option 1: All-Terra V-401, 44/32/22T
Bottom Bracket: Cartridge Sealed
Pedals: GT Slim Line Flat Pedal
Front Derailleur: Shimano Altus
Rear Derailleur: Alivio
Shifters: Shimano, Rapid Fire
Cog Set: Sunrace CS-M90, 11-34T, 9-Speed Cassette
Rims: All Terra Double Wall, 32H 27.5, disc specific
Tires: (F&R) All Terra Cypher 27.5X2.1"
Hubs: (F) Alloy Disc QR, (R) Alloy Cassette Disc QR
Brake: (F&R) Tektro Hydro Disc, 160mm Rotor
Brake Levers: Tektro Disc Brake Lever
Handlebar: 6061 Aluminum Riser, 680mm Width, 12mm Rise, 31.8mm Clamp
Stem: All Terra 1 1/8" Threadless, 4-Bolt W/ CNC Face Plate, 10? Rise, 31.8mm Clamp
Grips: GT Statement
Headset: Integrated seal bearing, 1-1/8? Upper + 1-1/2? Lower
Saddle: All Terra MTB
Seat Post: All Terra Alloy Micro-Adjust, 30.9mm
Seat Clamp: All Terra Alloy QR
 

GEOMETRY: 

Avalanche Elite Geometry

Additional Information on Mountain Bikes

AVAILABLE ONLINE & IN-STORE

More Information
SKU 17GTAvalancheSport27.5Black
Season 2017
Sizing SKUs LG: GTG27417M10LG, XL: GTG27417M10XL
Click & Collect Yes
Wheel Size 27.5" (650b)

GT Hardtail Bike Sizing Chart

Rider's Height (cm)
145
150
155
160
165
170
175
180
185
190
SM
MD
LG
XL

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