2021 Giant Bicycles Fathom 1

	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

Published Sizing Recommendations

Height

163 cm

182 cm

181 cm

180 cm

179 cm

188 cm

187 cm

198 cm

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.

Category Trend

Source:https://www.giant-bicycles.com/us/fathom-1-2021