2021 Giant Bicycles Fathom 1

Design
Flat Bar, Hardtail (Front suspension)
Frame
Aluminum
Suspension
130mm fork travel
Features
Disc brake
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category

Geometry

S
M
L
XL
Stack
622mm
622mm
631mm
640mm
Reach
425mm
445mm
470mm
490mm
Stack to Reach Ratio
1.46:1
1.4:1
1.34:1
1.31:1
Seat Tube Length, C-T
380mm
430mm
465mm
495mm
Top Tube Length, Effective/Horizontal Unknown
592mm
612mm
639mm
662mm
Head Tube Angle
66deg
66deg
66deg
66deg
Effective Seat Tube Angle, Seat Tube Top
75deg
75deg
75deg
75deg
Head Tube Length
95mm
95mm
105mm
115mm
Bottom Bracket Drop
60mm
60mm
60mm
60mm
Bottom Bracket Height
298mm
298mm
298mm
298mm
Chainstay Length
435mm
435mm
435mm
435mm
Chainstay Length Horizontal
430.8mm
430.8mm
430.8mm
430.8mm
Front-Center
725.6mm
745.6mm
774.5mm
798.4mm
Front-Center Horizontal
723.2mm
743.2mm
772.2mm
796.2mm
Wheelbase
1154mm
1174mm
1203mm
1227mm
Fork Offset/Rake
44mm
44mm
44mm
44mm
Trail
111.3mm
very high
111.3mm
very high
111.3mm
very high
111.3mm
very high
Mechanical Trail
101.6mm
101.6mm
101.6mm
101.6mm
Wheel Flop
41.3mm
41.3mm
41.3mm
41.3mm
Standover Height
712mm
726mm
746mm
771mm
Tire to Pedal Spindle
202.6mm
165 mm cranks
217.5mm
170 mm cranks
246.5mm
170 mm cranks
270.4mm
170 mm cranks
Pedal Spindle to Ground Clearance
133mm
165 mm cranks
128mm
170 mm cranks
128mm
170 mm cranks
128mm
170 mm cranks

1 Build

S
M
L
XL
Wheel Size
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
Tire Width
2.6in
2.6in
2.6in
2.6in
Tire Outer Diameter
716.1mm
716.1mm
716.1mm
716.1mm
Bike Length with Tires
1870.1mm
1890.1mm
1919.1mm
1943.1mm
Crank Length
165mm
170mm
170mm
170mm
Handlebar Width
780mm
780mm
780mm
780mm
Stem Length
40mm
40mm
50mm
50mm

Published Sizing Recommendations

Height
163 cm
to
182 cm
181 cm
to
180 cm
179 cm
to
188 cm
187 cm
to
198 cm

Stack and Reach vs. Category Trend

Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Learn more about the Upright/Aggressive Scale
Category Trend
Hardtail Trail MTB
Source:https://www.giant-bicycles.com/us/fathom-1-2021