Giant Fathom 1 27.5" Mountain Bike 2021 - Hardtail MTB
Get your dose of singletrack on a fun hardtail that puts you in control. The combination of a lightweight hardtail frame, 130mm suspension fork and 27.5 wheels with wide rims and high-volume tyres delivers loads of traction, speed and fun on the trail.
With its updated ALUXX SL aluminium frame, quick-handling 27.5 wheels and high-volume tyres, 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 tyres that absorb bumps and give you more traction—so you can tackle rougher trails with total control. The frame is designed with trail-friendly geometry that includes a more relaxed head angle and a 130mm suspension fork.
Trail Tuned Design
ALUXX SL aluminium frameset is hand-built in-house by the world leader in aluminium engineering.
Responsive Handling
Frame geometry is designed to optimise the confident, stable handling of plush high volume tyres (27.5x2.6), and is ideal for rugged, adventurous terrain.
Smooth Control
More relaxed frame geometry (compared to XC) and control-focused components deliver added control for trail riding conditions.
Occasionally, without notice, manufacturers change product design and/or specifications.
Frame | ALUXX SL-Grade Aluminium |
Fork | Giant Crest 34 RCL, 130mm, 44mm offset |
Stem | Giant Contact TR 35 |
Bars | Giant Contact TR, 780x35mm |
Front Brake | Shimano MT420 |
Rear Brake | Shimano MT420 |
Brake Lever | Shimano MT401 |
Rear Mech | SRAM NX Eagle |
Shifters | SRAM SX Eagle |
Speed | 12 |
Rims | Giant AM 27.5, tubeless ready, sleeve-joint rim, 30mm inner width |
Front Hub | Giant Tracker Performance Boost thru axle |
Rear Hub | Giant Tracker Performance Boost thru axle |
Spokes | Sapim |
Front Tyre | Maxxis Ardent Race 27.5x2.6, folding, TR |
Rear Tyre | Maxxis Ardent Race 27.5x2.6, folding, TR |
Seat Post | Giant Contact Switch dropper post with remote, 30.9 |
Saddle | Giant Romero |
Chainset | SRAM SX Eagle, 30T |
Bottom Bracket | SRAM DUB, press fit |
Chain | SRAM SX Eagle |
Cassette | SRAM SX Eagle, 11x50 |
Pedals | platform |
Giant Fathom 2021 Size Chart
Inside Leg (Inches) Vs Rider Height (Feet & Inches) |
26” |
27” |
28” |
29” |
30” |
31” |
32” |
33” |
34” |
35” |
36” |
37” |
5’ 3” |
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S |
S |
S |
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5’ 4” |
S |
S |
S |
S |
S |
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5’ 5” |
S |
S |
S |
S |
S |
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5’ 6” |
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S |
S |
S |
S |
S |
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5’ 7” |
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S |
S |
S |
M |
M |
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5’ 8” |
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M |
M |
M |
M |
M |
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5’ 9” |
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M |
M |
M |
M |
M |
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5’ 10” |
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M |
M |
M |
M |
M |
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5’ 11” |
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M |
M |
M |
M |
M |
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6’ 0” |
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M |
M |
L |
L |
L |
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6’ 1” |
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L |
L |
L |
L |
L |
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6’ 2” |
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L |
L |
L |
L |
L |
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6’ 3” |
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L |
L |
L |
L |
L |
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6’ 4” |
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L |
L |
XL |
XL |
XL |
Giant Fathom 27.5" 2021 Geometry
Size |
S |
M |
L |
XL |
SEAT TUBE LENGTH (mm) |
380 |
430 |
465 |
495 |
SEAT TUBE ANGLE |
75.0° |
75.0° |
75.0° |
75.0° |
TOP TUBE LENGTH (mm) |
592 |
612 |
639 |
662 |
HEAD TUBE LENGTH (mm) |
95 |
95 |
105 |
115 |
HEAD TUBE ANGLE |
66.0° |
66.0° |
66.0° |
66.0° |
FORK RAKE (mm) |
44 |
44 |
44 |
44 |
TRAIL (mm) |
113 |
113 |
113 |
113 |
WHEELBASE (mm) |
1154 |
1174 |
1203 |
1227 |
CHAIN STAY LENGTH (mm) |
435 |
435 |
435 |
435 |
BOTTOM BRACKET DROP (mm) |
60 |
60 |
60 |
60 |
STACK (mm) |
622 |
622 |
631 |
640 |
REACH (mm) |
425 |
445 |
470 |
490 |
STAND OVER HEIGHT (mm) |
712 |
726 |
746 |
771 |
HANDLEBAR WIDTH (mm) |
780 |
780 |
780 |
780 |
STEM LENGTH (mm) |
40 |
40 |
50 |
50 |
CRANK LENGTH (mm) |
165 |
170 |
170 |
170 |
WHEEL SIZE |
27.5" |
27.5" |
27.5" |
27.5" |
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