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GT Avalanche Sport Mountain Bike 2020 - Hardtail MTB

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£499.99
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Product Description

For the aspiring mountain biker who wants a trusted ride that will adapt as their skills develop.

Frame Description

All new 6061 alloy triple triangle frame design featuring floating seat stays, internal cable routing, stealth dropper post routing, forged drop outs w chainstay-mounted disc brake, Boost 141mm rear spacing, direct-mount front derailleur, tapered 1 1/8”- 1 ½" zero-stack head tube.

Key Features

  • Floating seat stays provide a more comfortable ride
  • Internal cable routing for a clean and modern look
  • Stealth dropper post routing
  • Blended wheel-size accommodates a wide range of riders 27.5" XS, S, M, L / 29" S, M, L, XL

Occasionally, without notice, manufacturers change product design and/or specifications.

Specification

Frame:All-New 6061 T6 Aluminum frame, Triple Triangle with floating seat stays, Internal Cable Routing, stealth dropper post routing, Boost 141 Forged drop-outs with disc brake mounts, Zero stack tapered  1 1/8"- 1.5" head tube, 27.5/29" wheels
Fork:SR Suntour XCT-DS, 100mm, hydraulic lockout, Coil
Headset:Semi Intgrated, Sealed Cartridge, Tapered
Stem:All Terra Alloy 1 1/8” Threadless, 4-Bolt W/ CNC Face Plate, 31.8, 8°, 80mm
Bars:GT All Terra Alloy Riser, 25mm rise, 8° sweep, 6° rise, 720mm width
Front Brake:Tektro M275 hydro disc, 160mm rotors
Rear Brake:Tektro M275 hydro disc, 160mm rotors
Brake Lever:Tektro M275
Front Mech:MicroShift Direct Mount
Rear Mech:Shimano Alivio
Shifters:Shimano Altus, 9-speed
Speed:18
Rims:WTB SX19, 32h
Front Hub:Sealed Alloy Disc, QR
Rear Hub:Sealed Alloy Disc, QR
Spokes:14g
Front Tyre:WTB Ranger Comp, 27.5/29 x 2.25", DNA Compound
Rear Tyre:WTB Ranger Comp, 27.5/29 x 2.25", DNA Compound
Seat Post:All Terra Micro Adjust, 6061 Alloy, 30.9 x 350mm
Saddle:All Terra MTB
Chainset:All Terra, 36/22
Bottom Bracket:Cartridge, square taper
Chain:KMC Z9, 9-speed
Cassette:Shimano HG200, 11-36, 9-speed
Pedals:GT Slim Line Flat Pedal

GT Avalanche Sport Mountain Bike 2020 - Hardtail MTB Reviews

Write your own review
Overall Rating:
5
out of 5
5.00
Build Quality
5.00
Performance
5.00
Value For Money
5.00

Customer Reviews (1)

5
It’s awsome

I got this and I love it. I was going to get a diamondback and I change to get the gt and I’m glad I changed to the GT

I got this and I love it. I was going to get a diamondback and I change to get the gt and I’m glad I changed to the GT

Close review
5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5

Avalanche Sizing

Avalanche Sizing

See the table below to find the right size GT Avalanche.

Frame Size

Recommended Height

Inches

Size

Feet and Inches

Centimetres

13

X Small

5’ 0” - 5’ 3”

152 – 160cm

15

Small

5’ 3” - 5’ 7”

160 – 170cm

17

Medium

5’ 7 - 5’ 10”

170 – 178cm

19

Large

5’ 10” - 6’ 2”

178 – 188cm

21

X Large

6’ 2” - 6’ 5”

188 – 196cm

23

XX Large

6’ 5” - 6’ 9”

196 – 205cm

 
Read our bike size guide for more information on sizing.

 

Avalanche Geometry

Size

XXS

XS

S

M

L

XL

Seat Tube Length

343

355

380

430

485

540

Horizontal Top Tube Length

553

569

585

610

638

667

Stand Over Height

699

706

721

757

794

833

Head Angle

69

69.5

69.5

69.5

69.5

69.5

Seat Angle

72.7 72.7

72.7

72.7

72.7

72.7

Chain Stay Length

 435 435

435

435

435

435

Head Tube Length 

 95 95

95

100

108

124

Bottom Brackett Height

 312 312

312

312

312

312

Fork Offset (Rake)

42 42

42

42

42

42

Wheel Base

1055 1066

1082

1107

1135

1165

BB Drop

 45 45

45

45

45

45

FC

624 635

651

676

704

734

Stack to HT

575 577

577

582

589

604

Reach to HT

374 389

405

429

454

479

Read our Mountain Bike Geometry Explained guide for more information on MTB geometry.  

Please note, all size information is provided as a guide - if you're unsure or need any further assistance you can call us on 01792 799508 ... we're happy to help!

MTB Hardtail Guide

 

Hardtail Mountain Bike Guide

Is a Hardtail mountain bike right for me?

If you’re new to the cycling world, we highly recommend taking a look at our bike buying guide overview or our mountain bike buying guide to help you decide what type of bike is right for your needs.

When you’re choosing a hardtail mountain bike, there are a few things to look out for which can help you to work out the quality and performance you can expect from a particular model.


Usage and suspension travel

Depending on the type of mountain bike riding you’ll be doing, you will want a bike with a longer travel or shorter travel suspension fork as well as components suited to more or less technical terrain.

Usage

Travel

Price Bracket

Pros

Cons

Recreational - riding on gravel tracks and rough roads

80 - 100mm

£200 - £500

Affordable. Low profile tyres roll quickly on smooth surfaces

Not very lightweight. Not capable on technical terrain. Components are less durable.

Cross-country / XC - more adventurous off-road riding and XC racing

100mm

£500 - £9,000

Lightweight, especially high-end carbon models. Fast climbing and accelerating. Efficient on long rides

Less capable on technical terrain than a trail hardtail

Trail - riding technical trails and trail centre loops

120mm – 150mm

£800 - £4,000

More capable on technical terrain, especially fun downhill sections

Heavier than an XC hardtail. Less efficient when climbing

Jump - Dirt jumping and skatepark riding

100mm

£500 - £1,500

Robust frames and components. Ideal for learning airborne skills

Not good for general mountain bike riding

Usage

Travel
& Price

Pros
/ Cons

Recreational - riding on gravel tracks and rough roads

80 - 100mm

£200 - £500

Affordable. Low profile tyres roll quickly on smooth surfaces

Not very lightweight. Not capable on technical terrain. Components are less durable

Cross-country / XC - more adventurous off-road riding and XC racing

100mm

£500 - £9,000

Lightweight, especially high-end carbon models. Fast climbing and accelerating. Efficient on long rides

Less capable on technical terrain than a trail hardtail

Trail - riding technical trails and trail centre loops

120mm – 150mm

£800 - £4,000

More capable on technical terrain, especially fun downhill sections

Heavier than an XC hardtail. Less efficient when climbing

Jump - Dirt jumping and skatepark riding

100mm

£500 - £1,500

Robust frames and components. Ideal for learning airborne skills

Not good for general mountain bike riding


Frame Material

Hardtail MTB frames are mostly made from aluminium alloy. High-end cross-country race bikes will have carbon fibre frames while trail hardtails and jump bikes sometimes feature steel frames.

Aluminium

Aluminium alloy frames are strong and lightweight. More expensive alloy hardtail MTBs tend to have ‘butted’ and/or formed frames which are lighter but just as strong.

Steel

Steel frames are heavier but offer a more comfortable ride, especially on higher end models, thanks to the more compliant nature of steel.

Carbon fibre

Carbon fibre composite frames offer the best of both worlds as they are strong, lightweight and comfortable. They are more expensive however and carbon hardtails start at around £1,300


Groupset and Drivetrain

A bike’s groupset, or drivetrain, is where the biggest difference in component quality is seen. A complete groupset comprises of the following parts:

  • Chainset (aka Crankset)
  • Bottom bracket
  • Brakes
  • Brake levers
  • Shifters
  • Front & rear derailleur
  • Chain
  • Cassette

Mountain bike groupset components are typically supplied by either Shimano or SRAM, with additional manufacturers like Formula, Hope, Magura, Tektro and TRP supplying brake systems.

Shimano & SRAM both produce a range of groupsets to suit different budgets. The hierarchy table here compares the different Shimano & SRAM groupsets to determine which bikes offer the best performance. 

Groupset comparison - Shimano & SRAM

What gearing options are there?

Most hardtails offer a wide range of gears for taking on a variety of terrain. It’s not all about the number of gears though as fewer gears on the front, combined with a wide range rear cassette are much easier to use, but still give you the same wide range of gears. As you go up the price points shifting gets easier with more cogs on the rear cassette and fewer front chainrings.

Entry-level hardtails will have a triple chainset with a seven (3x7) or eight (3x8) speed cassette

Mid-level hardtails tend to have a double chainset with a nine (2x9) or ten (2x10) speed cassette

High-end hardtails get a single front chain ring with a ten (1x10), eleven (1x11) or even twelve (1x12) speed cassette

Which are the best brakes?

There are three types of brakes found on most hardtail mountain bikes:

Rim brake example

Rim brakes are powerful in the dry but are significantly less powerful in the wet.

Mechanical disc brake example

Mechanical disc brakes are powerful in all weather conditions

Hydraulic disc brake example

Hydraulic disc brakes are the most powerful in all weather conditions, and also offer the best braking precision.


Wheel Size

You’ve probably noticed that mountain bikes come in a choice of wheel size, mainly a 27.5 inch wheel (also known as a 650B wheel) or a 29inch wheel (known as a 29er). Another option is 27.5+ or 6Fattie wheels which bridge the gap between 27.5” and 29” wheels. The traditional MTB wheel size is 26”, but are now only found on some small sized MTBs as well as jump bikes. The difference between these wheel sizes can have a dramatic effect on the way a bike feels and handles out on the trail.

MTB wheel sizes

27.5” (650b) wheels strike the ideal balance between fast rolling and nimble handling. They are lighter than 29” wheels so are faster to accelerate. On the other hand, the smaller wheel size rolls less efficiently than the larger size, making the bike more prone to losing speed over rough ground.

29” wheels roll fastest but are less nimble. These wheels are naturally smoother over rough ground but are heavier and slower to accelerate. Larger riders may find a better fit on a 29er, but smaller riders may find 29” wheels a little cumbersome.

27.5+ (6fattie) wheels feature wider 2.8” – 3.0” tyres and offer more cushioning (float) as well as more grip. With the extra size of the high-volume tyres, the overall wheel diameter is similar to a 29er so these wheels carry speed very well on rough ground. Plus sized wheels are ideal for riding more challenging terrain.

26” wheels are the nimblest and are great for smaller riders as well as jump bikes. While quick to accelerate these wheels are the slowest over rough ground.

Does tyre width make a difference?

Tyre width effects both speed as well as grip. Narrower tyres are faster rolling while wider ones offer more grip as well as more cushioning (float).

Recreational tyre example

1.95” - 2.0” tyres roll quickly and are good for recreational riding and light off-roading.

Trail tyre example

2.2” - 2.6” tyres are a little slower on smooth surfaces but offer much better grip in the corners and are ideal for MTB trail riding

Plus size tyre example

Plus size (6fattie) 2.8” – 3.0” tyres increase the overall diameter of the wheel so still roll quite quickly while offering a lot more grip and float. These are best for rougher terrain


Suspension Fork

The performance of suspension forks varies a lot. Forks on higher end bikes tend to offer more control and are more adjustable. Look for Fox, RockShox or Manitou forks with adjustable rebound and compression damping for the best performance on technical trails. The performance level you require will depend on what type of riding you want to do. 

For recreational riding on roads and gravel tracks, you won’t need a high-performance fork. A lockout feature can be useful for more efficient climbing on roads and smoother tracks. Air sprung forks are lighter than coil sprung forks.

For cross cross-country mountain biking lightweight air sprung forks are best. Adjustable rebound damping is essential for serious off-roading and a remote lockout switch will allow you to quickly firm up the suspension when climbing.

Trail hardtails feature longer travel suspension forks for riding on rougher terrain. Adjustable rebound damping is essential for control on challenging trails. Lockout is less important on these bikes as they are catering for riders who like the downs more than the ups. Adjustable compression damping is useful as it can help you achieve optimum performance levels. Thru-axles and tapered steerer tubes improve steering control.

Suspension fork in action

Finance

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It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

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If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.

What's In The Box

What's In The Box

As cyclists ourselves, we know you will be keen to get out on your new bike as soon as possible. That's why we provide you with all the essential kit you need to get your shiny new bike rolling for the first time.

Most bikes don't come with pedals as standard so we include a set of basic pedals, free of charge with every bike we send out. We will also provide you with a pedal spanner to fit them and a 9-key trail tool, along with full instructions for setting your bike up out of the box. Each bike is sent out with a 16 point, quality control check sheet so you can be confident that your bike has been fully checked by our qualified mechanics.

What's in the box
  • Basic setup instructions
  • 16 point quality control checklist
  • Free tredz multitool
  • Free tred pedal spanner
  • Free basic pedals
  • Free drawstring kit bag
  • Free bike insurance voucher

All these items are provided at no extra charge and are packed into a Tredz drawstring bag that doubles up as a handy backpack for carrying your ride essentials.

  • Basic bike setup instructions
  • Free ‘basic’ pedals
  • Free Tredz pedal spanner
  • Free Tredz 9-key trail tool
  • Free Tredz drawstring bag
  • Free 8 weeks insurance voucher
  • 16 point, quality control check sheet

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