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Giant Fathom 3 2019 Hardtail Mountain Bike

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Product Details

Giant Fathom 3 2019 -  Hardtail Trail MTB

This Giant Fathom 3 trail mountain bike comes impressively spec'd with Aluxx SL frame, Tektro hydraulic disc brakes and Maxxis tubeless tyres.

Key Features

  • Fitted with Maxxis Ardent tubeless tyres, previously reserved for Giant's Pro-quality £2,000-plus bicycles
  • Giant so believe in the benefits of tubeless tyres (improved cushioning, traction and puncture resistance) they are now fitting them as standard on more and more of their bikes from around £1,000 - More on tubeless tyres
  • The frame is built with Giant's lighter weight ALUXX SL Grade alloy tubing
  • Proper trail geometry
  • The slack 67˚ head tube angle improves stability for confident downhilling
  • The steep-ish 73.5˚ seat tube angle makes it easier to ride out the saddle and boost yourself up climbs
  • The Shimano Deore/Alivio 2x19 drivetrain with Shadow Plus rear mech offers a very decent range of gears for all terrain via its 22/36 chainset and 12-36 cassette
  • Tektro HDM 275 hydraulic disc brakes,the benefits of good quality hydraulic disc brakes

Here's how Giant describe the Fathom 3


ALUXX SL aluminum frameset is hand-built in-house by the world leader in aluminum engineering.


Frame geometry is designed to optimize the confident, stable handling of 27.5+ tyres, and is ideal for rugged, adventurous terrain.


More relaxed frame geometry (compared to XC) and control-focused components deliver added control for trail riding conditions.

Giant Fathom 3 Size Guide

The sizing below is a guide only, so please get in touch if you're unsure or between sizes. Height is in feet and inches.

  • Small: 5' 3" - 5' 7"
  • Medium: 5' 7" - 6' 0"
  • Large: 6' 0" - 6' 4"
  • Extra Large: 6' 4" +

Why Buy From Us?

  • Voted Britain's Best Bike Shop 2017/18
  • Rated excellent on Trustpilot by our customers
  • Free bike delivery
  • No fuss returns
  • Bikes arrive built by expert bike mechanics
  • Independent since 1977 - cooperative, not corporate. Read our story.

Shop All Giant Mountain Bikes >

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Technical Specifications

Giant Fathom 3 2019 
FrameALUXX SL-Grade Aluminum
ForkSuntour SF19-Raidon 32, Boost LOR, tapered steerer, QR 15x110mm
ShiftersShimano Alivio, 2x9
Rear DerailleurShimano Deore, Shadow+
Front DerailleurShimano FD-M4020-D
ChainsetShimano FC-MT210 Boost, 22/36
Bottom BracketShimano Press Fit
ChainKMC X9
Cassette / FreewheelShimano HG400-9, 12x36
RimsGiant AM 27.5, tubeless ready, sleeve-joint rim, 30mm inner width
Hubs[F] Giant Tracker Performance Boost 15x110mm, sealed bearing [R] Giant Tracker Sport Boost QR 141, loose ball
TyresMaxxis Ardent 27.5x2.4, wire, 60 tpi, TR , tubeless
BrakesTektro HDM 275 [F] 180mm [R] 160mm, hydraulic disc
Brake leversTektro HDM 275
HandlebarsGiant Connect Trail, 780mm x 31.8mm
StemGiant Connect, 8-degree
SaddleGiant Contact (neutral)
SeatpostGiant Sport


Our suppliers reserve the right to change specifications and prices without notice. Edinburgh Bicycle Cooperative will do all it can to maintain prices and specifications on this web site, however we do reserve the right to change specifications and prices without notice. Similarly, despite the wonders of modern computers, it is realistic to expect the colour of any item bought to differ subtly from the image online.