2021 BMC Switzerland ALPENCHALLENGE Base

	S	M	L	XL
Stack	530mm	571mm	591mm	630mm
Reach	390mm	405mm	415mm	430mm
Stack to Reach Ratio	1.36:1	1.41:1	1.42:1	1.47:1
Seat Tube Length, C-T	440mm	510mm	560mm	610mm
Top Tube Length, Effective/Horizontal HT Top	552mm	585mm	601mm	634mm
Top Tube Slope	11.9deg	8.6deg	5.6deg	4.6deg
Head Tube Angle	71deg	71deg	71deg	71deg
Seat Tube Angle	73deg	72.5deg	72.5deg	72deg
Head Tube Length	122mm	165mm	187mm	228mm
Bottom Bracket Drop	50mm	50mm	50mm	50mm
Bottom Bracket Height	296mm	296mm	296mm	296mm
Chainstay Length	436mm	436mm	436mm	436mm
Chainstay Length Horizontal	433.1mm	433.1mm	433.1mm	433.1mm
Front-Center	608mm	637mm	654mm	682mm
Front-Center Horizontal	605.9mm	634.9mm	651.9mm	679.9mm
Wheelbase	1039mm	1068mm	1085mm	1113mm
Fork Offset/Rake	48mm	48mm	48mm	48mm
Fork Length (On-Axis)	405mm	436mm	405mm	405mm
Trail	68.4mm high	68.4mm high	68.4mm high	68.4mm high
Mechanical Trail	64.7mm	64.7mm	64.7mm	64.7mm
Wheel Flop	21.1mm	21.1mm	21.1mm	21.1mm
Tire to Pedal Spindle	92mm 170 mm cranks	121mm 170 mm cranks	133mm 175 mm cranks	161mm 175 mm cranks
Pedal Spindle to Ground Clearance	126mm 170 mm cranks	126mm 170 mm cranks	121mm 175 mm cranks	121mm 175 mm cranks

Published Sizing Recommendations

Height

—

168 cm

180 cm

178 cm

190 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:www.bmc-switzerland.com