2021 Sonder Frontier SX Eagle Rigid

Category
Rigid MTB
Design
Flat Bar, Rigid, 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
Somewhat aggressive stack and reachvs category

Geometry

Small
Medium
Large
X-Large
Stack
566mm
580mm
594mm
613mm
Reach
390mm
420mm
440mm
460mm
Stack to Reach Ratio
1.45:1
1.38:1
1.35:1
1.33:1
Seat Tube Length, C-T
380mm
430mm
480mm
520mm
Top Tube Length, Effective/Horizontal HT Top
566mm
602mm
622mm
647mm
Top Tube Slope
22deg
17.2deg
13.1deg
10.7deg
Head Tube Angle
68deg
68deg
68deg
68deg
Seat Tube Angle
73deg
73deg
73deg
73deg
Head Tube Length
110mm
130mm
130mm
150mm
Bottom Bracket Drop
50mm
50mm
50mm
50mm
Bottom Bracket Height
313.1mm
313.1mm
313.1mm
313.1mm
Chainstay Length
445mm
445mm
445mm
445mm
Chainstay Length Horizontal
442.2mm
442.2mm
442.2mm
442.2mm
Front-Center
648.8mm
686.6mm
706.6mm
734mm
Front-Center Horizontal
646.8mm
684.8mm
704.8mm
732.3mm
Wheelbase
1089mm
1127mm
1147mm
1174.5mm
Fork Offset/Rake
51mm
51mm
51mm
51mm
Trail
91.7mm
very high
91.7mm
very high
91.7mm
very high
91.7mm
very high
Mechanical Trail
85mm
85mm
85mm
85mm
Wheel Flop
31.9mm
31.9mm
31.9mm
31.9mm
Standover Height
764mm
793mm
825mm
853mm
Tire to Pedal Spindle
115.6mm
170 mm cranks
153.5mm
170 mm cranks
173.5mm
170 mm cranks
200.9mm
170 mm cranks
Pedal Spindle to Ground Clearance
143.1mm
170 mm cranks
143.1mm
170 mm cranks
143.1mm
170 mm cranks
143.1mm
170 mm cranks

SX Eagle Rigid Build

Small
Medium
Large
X-Large
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
2.8in
2.8in
2.8in
2.8in
Tire Outer Diameter
726.2mm
726.2mm
726.2mm
726.2mm
Bike Length with Tires
1815.2mm
1853.2mm
1873.2mm
1900.7mm

Published Sizing Recommendations

Height
5 ft 2 in
to
5 ft 7 in
5 ft 6 in
to
5 ft 10 in
5 ft 9 in
to
6 ft 2 in
6 ft 2 in
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
Rigid MTB
Source:https://alpkit.com/collections/sonder-frontier/products/sonder-frontier-sx-eagle-rigid