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Giant Fathom 27.5" 1 Mountain Bike (2020)
Get your dose of singletrack with more confidence and control. The combination of a lightweight hardtail frame, 120mm suspension fork, and 27.5 wheels with wide rims and cushy high-volume tires delivers loads of traction, speed and fun on the trail.
With its lightweight ALUXX SL aluminum frame, 27.5 wheels and high-volume tires, the new Fathom is a great choice for technical terrain and singletrack shredding. It blends the efficient ride quality of a classic hardtail with the confident ride quality of larger tires that absorb bumps and give you more traction—so you can tackle rougher trails with total control. The new frame is designed with trail-friendly geometry that includes a more relaxed head angle made for a 120mm suspension fork
Proven alloy performance
ALUXX SL aluminum frameset is hand-built in-house by the world leader in aluminum engineering.
Traction and stability
Frame geometry is designed to optimize the confident, stable handling of 27.5 wheels with plush high-volume tires—ideal for rugged, adventurous terrain.
More relaxed frame geometry (compared to XC) and control-focused components deliver added control for trail riding conditions.
|Sizes||XS, S, M, L, XL|
|Colors||Gunmetal Black / Olive Green|
|Frame||ALUXX SL-Grade Aluminum|
|Fork||RockShox Recon RL 120mm, Solo Air, Taper, 15x110 Maxle Lite|
|Handlebar||Giant Connect Trail, 780x31.8, [GA 690]|
|Seatpost||Giant Contact Switch dropper post with remote, 30.9|
|Saddle||Giant Contact (neutral)|
|Shifters||SRAM SX Eagle|
|Rear Derailleur||SRAM NX Eagle|
|Brake Levers||Shimano MT401|
|Cassette||SRAM SX Eagle, 11x50|
|Chain||SRAM SX Eagle|
|Crankset||TruVativ Descendent 6k DUB, 30t|
|Bottom Bracket||SRAM DUB, press fit|
|Rims||Giant AM 27.5 tubeless ready sleeve-joint rim, 30mm inner width|
|Hubs||[F] Giant Tracker Performance Boost 15x110, sealed bearing [R] Giant Tracker Giant Sport Boost QR 141, loose ball|
|Tires||Maxxis Ardent Race 27.5x2.6, folding, TR|
|A||SEAT TUBE LENGTH (inch)||15.4||17.5||18.9||20.9|
|B||SEAT TUBE ANGLE||73.5°||73.5°||73.5°||73.5°|
|C||TOP TUBE LENGTH (inch)||23||23.8||24.6||25.4|
|D||HEAD TUBE LENGTH (inch)||3.9||4.3||4.9||5.5|
|E||HEAD TUBE ANGLE||67.0°||67.0°||67.0°||67.0°|
|F||FORK RAKE (inch)||1.7||1.7||1.7||1.7|
|I||CHAIN STAY LENGTH (inch)||16.7||16.7||16.7||16.7|
|J||BOTTOM BRACKET DROP (inch)||1.8||1.8||1.8||1.8|
|M||STAND OVER HEIGHT (inch)||27.2||28.8||29.3||30.9|
|N||HANDLEBAR WIDTH (inch)||30.7||30.7||30.7||30.7|
|O||STEM LENGTH (inch)||1.6||2||2.4||2.8|
|P||CRANK LENGTH (inch)||6.7||6.9||6.9||6.9|