Surly Big Dummy

Name: Surly Big Dummy
Brand: Surly

2017 UrbanUtilityLong-tail cargo

Suspension: Rigid
Wheels: 26″
Drivetrain: 10 11–36t
Gear range: 327%
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

15 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 CroMoly steel. Main triangle double-butted. TIG-welded cargo specific engineered for stiffness. Not identified

Suspension

1 part

Fork
- Surly

Drivetrain

7 parts

Bottom bracket

68mm wide, threaded English 1.37˝ x 24t Not identified
Cassette
- microSHIFT 11–36t
CS-H100
Chain
- KMC X10 10 speeds
Crankset
- Truvativ Firex
Front derailleur
- Shimano Deore FD-T611-3
FD-T611
Rear derailleur
- SRAM GX
Shifters

X7 Trigger, Not identified

Brakes

2 parts

Brake levers
- SRAM FR-5
FR-5
Brakes
- Avid

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Handlebar

Premetec, Not identified
Headset
- Cane Creek Forty
Saddle
- WTB Volt
Seatpost
- Kalloy
SP-342
Stem

H.L., 31.8mm Not identified

Other components

1 part

Racks

400 lb combined rider and cargo. Max cargo 200 lb 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
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

Not published by the manufacturer: Bottom bracket height, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Steel
Fork material: Steel
Weight limit: 181.44 kg

400.0 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 36

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Tire clearance: Maximum tire width: 2.5″
Tire width: 2.3″
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 26″