2021 bmx alpenchallenge Base

Category
Commuter
Design
Flat Bar, Rigid, non-suspension corrected
Frame
Aluminum
Fork
Aluminum
Features
Disc brake
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category
Average stack and reachvs category

Geometry

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

Base Build

S
M
L
XL
Wheel Size
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
Tire Width
35mm
35mm
35mm
35mm
Tire Outer Diameter
692mm
692mm
692mm
692mm
Bike Length with Tires
1731mm
1760mm
1777mm
1805mm
Crank Length
170mm
170mm
175mm
175mm
Handlebar Width
600mm
600mm
600mm
600mm
Stem Length
90mm
90mm
100mm
100mm
Stem Angle
8deg
-8deg
8deg
8deg

Published Sizing Recommendations

Height
168 cm
to
180 cm
178 cm
to
190 cm
190 cm
to

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
Commuter
Source:www.bmc-switzerland.com