Surly Big Dummy

Name: Surly Big Dummy
Brand: Surly

2020 UrbanUtilityLong-tail cargo

Last known price: $2,150

Prices shown first for United States
Suspension: Rigid
Wheels: 26″
Drivetrain: 3 × 10 26–48t / 11–36t
Gear range: 604%
Frame: Steel
Brakes: Mechanical disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

16 of 21 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

Surly Big Dummy, Surly 4130 Chromoly steel. Surly Big Dummy, Surly 4130 Chromoly steel. Main triangle double-butted. TIG-welded cargo specific engineered for stiffness. Not identified

Suspension

1 part

Fork
- Surly

Drivetrain

7 parts

Bottom bracket
- SRAM
Cassette
- microSHIFT 11–36t
CS-H100
Chain
- KMC X10 10 speeds
Crankset
- Truvativ 48/36/26t
Front derailleur
- Shimano Deore FD-T611-3
FD-T611
Rear derailleur
- SRAM GX
Shifters

X5 Trigger Not identified

Brakes

3 parts

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Handlebar

Premetec Not identified
Headset
- Cane Creek Forty
Saddle
- WTB Volt
Seatpost

2 -Bolt. 27.2mm Not identified
Stem

4 Bolt 31.8mm clamp Not identified

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 418mm

Stack 580mm

Wheelbase 1459mm

Head angle 72.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 26″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	399.6	418.1	431.7	444.1
Stackmm	566.5	580	594.1	611.3
Top tube lengthmm	573.5	596.1	614.1	631.8
Seat tube lengthmm	406.4	457.2	508	558.8
Head tube lengthmm	131.7	145.9	160.8	178.8
Head tube angle	72°	72°	72°	72°
Seat tube angle	73°	73°	73°	73°
Chainstay lengthmm	827	827	827	827
Wheelbasemm	1435.9	1458.8	1477	1495
Front centermm	611	634	652	670
Bottom bracket dropmm	40	40	40	40
Standover heightmm	740.4	771.5	802.9	835.8
Fork rakemm	43	43	43	43
Trailmm	64	64	64	64
Stack/reach ratio	1.42	1.39	1.38	1.38
Suspension and parts
Crank lengthmm	170	175	175	175
Handlebar widthmm	700	750	750	750
Stem lengthmm	80	90	100	110
Stem angle	7°	7°	7°	7°

Not published by the manufacturer: Bottom bracket height, Front travel, Rear travel, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Steel
Fork material: Steel

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 3
Smallest chainring: 26
Largest chainring: 48
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 18.8 in
Highest gear: 113.5 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire clearance: Maximum tire width: 2.5″
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 26″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.2 km/h
Highest gear: 43.5 km/h

Total gear range 604%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.