Surly Pack Rat Frameset

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A Nimble Front Load-Carrying Bike

Pack Rat is specifically designed around porteur-style racks and front-loading optimization. Dedicated commuters, credit card tourers, and sweaty back people looking to ditch their backpack need look no further.

Having your stuff in front of you allows for better weight distribution, keeping the bike nimble and allowing you to more efficiently use your body English to steer from the rear. The drawback typically lies in how it affects the bike’s handling. Pack Rat’s front cargo-specific design eliminates those issues, leaving you wondering if you’re really even hauling any cargo at all.

  • Optimized for carrying front loads, complete bike includes front rack
  • Internal routing on fork for generator hubs
  • Frame sizes 38–50cm have clearance for 26’ x 2.0˝ tires. Frame sizes 52–58cm have clearance for 650b x 48mm tires (with or without fenders).
Frame Construction

4130 Chromoly, Natch tubing, double-butted main triangle, TIG welded, ED coated

Fork Construction

4130 Chromoly, Natch tubing, double-butted tapered fork blades, brazed lugs, ED coated

Rear Dropout Configuration


Rear Hub Spacing

"Gnot-rite" 132.5mm

10 x 130mm or 10 x 135mm

Front Hub Spacing

10 x 100mm

Rear Brake

Rim - Canti (removable posts)

Front Brake

Rim - Canti (removable posts)

Head Tube


Steerer Tube

Ø28.6mm (1-1/8")

Crown Race

Ø30mm (1-1/8")

Stock Headset Upper (S.H.I.S.)


Stock Headset Lower (S.H.I.S.)


Seat Collar




Front Derailleur (Clamp)

Bottom-pull (Ø28.6mm)

Max Chainring (CL)[3]

1x (Road): 50T

2x (Road): 39/53T

Bottom Bracket

68mm threaded (1.37" x 24TPI)

Tire Clearance Frame [1]/[2]

26in: 26 x 2.0" (38 - 50cm) (with or without fenders)

650b: 650b x 48mm (52 -58cm) (with or without fenders)

Tire Clearance Fork [1]

26in: 26 x 2.0"" (38 - 50cm) (with or without fenders)

650b: 650b x 48mm (52 -58cm) (with or without fenders)

Rigid Fork Spec

400 x 44mm

Max Suspension Fork Length [4]


Bottle Mounts Frame

1 Standard + 2 Three-Pack

Bottle Mounts Fork


Rack Mounts Frame

Yes (upper and lower threaded)

Rack Mounts Fork

Yes (upper and mid-blade threaded)

Fender Mounts Frame


Fender Mounts Fork


Other Features

Downtube mounted shifter bosses