2023 Surly Bikes Big Dummy Base SM

Build

26 in × 2.5 in

Insights

Average stack and reach vs trend of cargo bikes

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
571.1mm
Reach
409.9mm
Stack to Reach Ratio
1.39:1
Seat Tube Length, C-TTT
406mm
Top Tube Length, Effective/Horizontal HT Top
590mm
Top Tube Slope
17deg
Head Tube Angle
70deg
Seat Tube Angle
72.5deg
Head Tube Length
150mm
Bottom Bracket Drop
40mm
Bottom Bracket Height
303mm
Chainstay Length
821mm
Chainstay Length Horizontal
820mm
Front-Center
650.2mm
Front-Center Horizontal
649mm
Wheelbase
1469mm
Fork Offset/Rake
43mm
Fork Length (Axle-To-Crown)
417.8mm
Trail
79.1mm
high
Mechanical Trail
74.3mm
Wheel Flop
25.4mm
Standover Height
725mm
Tire to Pedal Spindle Distance
With 170 mm cranks
137.2mm
Pedal Spindle to Ground Clearance
With 170 mm cranks
133mm

Base Build

Wheel Size
26 inch (559mm BSD)
Tire Width
2.5in
Tire Outer Diameter
686mm
Bike Length with Tires
2155mm
Crank Length
170mm
Handlebar Width
718mm
Stem Length
70mm
Stem Angle
7deg
Suspension Type
Rigid, suspension corrected
Bar Type
Flat Bar
Frame Material
Steel
Fork Material
Steel
Brake Type
Disc

Published Sizing Recommendations

Height
133 ft 4 in
to
148 ft 2 in
Source:https://surlybikes.com/bikes/big_dummy#spec-geo