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Surly Bikes

FM3231

Surly Big Dummy Frameset

The Surly Big Dummy. Designed to transport a rider and up to 200 pounds of cargo (even a passenger or two), the Big Dummy retains an extremely smooth and maneuverable ride.

  • Fender eyelets, four bottle cage mounts, and Surly Trip Guides for continuous brake/shift housing or brake hydraulic lines
  • 100% Surly 4130 chromoly steel, canti and disc brake compatible; fork is suspension corrected for 80mm
  • Length of the frame requires 2 chains and tandem cables
  • 26 x 2.5" maximum tire clearance; absolutely no limitation on chainring sizes
  • Weight Limit: 400 lbs. combined rider & cargo
  • Compatible Surly cargo rack rails, bags, collars and platforms, sold separately
  • Frame Type: Rigid
  • Fork Type: Rigid
  • Wheel Size: 26"
  • Frame Material: Steel
  • Fork Material: Steel
  • Front Axle: QR x 100mm
  • Rear Axle: QR x 135mm
  • Brake Type: Disc

Frame measurements (mm)  SM MD LG XL
A. BB Drop 40 40 40 40
B. Chainstay Length 827 827 827 827
C. Fork Length - Axle to Crown 425 425 425 425
D. Fork Offset 43 43 43 43
E. Head Tube Angle (deg) 72 72 72 72
F. Headtube Length 131.7 145.9 160.8 178.8
G. Reach 399.6 418.1 431.7 444.1
H. Seat Tube Angle (deg) 73 73 73 73
I. Seat Tube Length - Center to Top 406.4 457.2 508 558.8
J. Stack 566.5 580 594.1 611.3
K. Standover 740.4 771.5 802.9 835.8
L. Top Tube Length (Effective) 573.5 596.1 614.1 631.8
M. Wheelbase 1435.9 1458.8 1477 1495
Component measurements (mm)
Crank Arm Length 170 175 175 175
Handlebar Width 700 750 750 750
Handlebar Rise / Drop - - - -
Stem Length 80 90 100 110
Stem Angle (deg) 7 7 7 7

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