2008 Surly Bikes Big Dummy Base

Category
Cargo
Design
Flat Bar, Rigid, suspension corrected
Frame
Steel
Fork
Steel
Features
Rim brake

Geometry

Small (16)
SM
Medium (18)
Large (20)
MD
xLarge (22)
LG
Stack
566.5mm
571.1mm
580mm
594.1mm
599.3mm
611.3mm
627.4mm
Reach
399.6mm
409.9mm
418.1mm
431.7mm
431.1mm
444.1mm
447.2mm
Stack to Reach Ratio
1.42:1
1.39:1
1.39:1
1.38:1
1.39:1
1.38:1
1.4:1
Seat Tube Length, C-T
406.4mm
—
457.2mm
508mm
—
558.8mm
—
Seat Tube Length, C-TTT
—
406mm
—
—
432mm
—
508mm
Top Tube Length, Effective/Horizontal Center
573.5mm
—
596.1mm
614.1mm
—
631.8mm
—
Top Tube Length, Effective/Horizontal HT Top
—
590mm
—
—
620mm
—
645mm
Top Tube Length, Actual C-C
550.6mm
—
570.1mm
588.7mm
—
609.6mm
—
Top Tube Slope
22.1deg
17deg
16.3deg
13deg
16.5deg
9.4deg
11.6deg
Head Tube Angle
72deg
70deg
72deg
72deg
70deg
72deg
70deg
Seat Tube Angle
73deg
72.5deg
73deg
73deg
72.5deg
73deg
72.5deg
Head Tube Length
131.7mm
150mm
145.9mm
160.8mm
180mm
178.8mm
210mm
Bottom Bracket Drop
40mm
40mm
40mm
40mm
40mm
40mm
40mm
Bottom Bracket Height
298mm
303mm
298mm
298mm
303mm
298mm
303mm
Chainstay Length
827mm
821mm
827mm
827mm
821mm
827mm
821mm
Chainstay Length Horizontal
826mm
820mm
826mm
826mm
820mm
826mm
820mm
Front-Center
611.2mm
650.2mm
634mm
652.2mm
681.6mm
670.2mm
707.9mm
Front-Center Horizontal
609.9mm
649mm
632.8mm
651mm
680.4mm
669mm
706.8mm
Wheelbase
1435.9mm
1469mm
1458.8mm
1477mm
1500.4mm
1495mm
1526.8mm
Fork Offset/Rake
43mm
43mm
43mm
43mm
43mm
43mm
43mm
Fork Length (On-Axis)
420mm
—
420mm
420mm
—
420mm
—
Fork Length (Axle-To-Crown)
—
417.8mm
—
—
417.8mm
—
417.8mm
Trail
64.6mm
mid/​neutral
79.1mm
high
64.6mm
mid/​neutral
64.6mm
mid/​neutral
79.1mm
high
64.6mm
mid/​neutral
79.1mm
high
Mechanical Trail
61.5mm
74.3mm
61.5mm
61.5mm
74.3mm
61.5mm
74.3mm
Wheel Flop
19mm
25.4mm
19mm
19mm
25.4mm
19mm
25.4mm
Standover Height
740.4mm
725mm
771.5mm
802.9mm
773mm
835.8mm
823mm
Tire to Pedal Spindle
103.2mm
170 mm cranks
137.2mm
170 mm cranks
121mm
175 mm cranks
139.2mm
175 mm cranks
163.6mm
175 mm cranks
157.2mm
175 mm cranks
189.9mm
175 mm cranks
Pedal Spindle to Ground Clearance
128mm
170 mm cranks
133mm
170 mm cranks
123mm
175 mm cranks
123mm
175 mm cranks
128mm
175 mm cranks
123mm
175 mm cranks
128mm
175 mm cranks

Base Build

Small (16)
SM
Medium (18)
Large (20)
MD
xLarge (22)
LG
Wheel Size
26 in
559 mm BSD
26 in
559 mm BSD
26 in
559 mm BSD
26 in
559 mm BSD
26 in
559 mm BSD
26 in
559 mm BSD
26 in
559 mm BSD
Tire Width
60mm
2.5in
60mm
60mm
2.5in
60mm
2.5in
Tire Width Max
60mm
—
60mm
60mm
—
60mm
—
Tire Outer Diameter
676mm
686mm
676mm
676mm
686mm
676mm
686mm
Bike Length with Tires
2111.9mm
2155mm
2134.8mm
2153mm
2186.4mm
2171mm
2212.8mm
Crank Length
170mm
170mm
175mm
175mm
175mm
175mm
175mm
Handlebar Width
700mm
718mm
750mm
750mm
735mm
750mm
735mm
Stem Length
80mm
70mm
90mm
100mm
70mm
110mm
80mm
Stem Angle
7deg
7deg
7deg
7deg
7deg
7deg
7deg

Published Sizing Recommendations

Height
—
1600 cm
to
1778 cm
—
—
1676 cm
to
1829 cm
—
1778 cm
to
1956 cm

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
Cargo
Source:https://surlybikes.com/bikes/big_dummy, https://surlybikes.com/bikes/big_dummy#spec-geo