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Surly Bikes

BK1494

Surly Pack Rat 650b

The Pack Rat is designed around porteur-style racks and front-loading optimization, with a front cargo-specific design to eliminate steering issues. The fork features internal routing for generator hubs and rear frame dropouts to accommodate multiple drivetrain configurations. It’s an ideal choice for loaded commutes and bike trips with a lighter load, but also rides great when unloaded.
  • Features 650b wheels, with room for tires up to 650b x 48mm
  • Surly 24-pack rack included with complete bike
  • 100% Surly 4130 Chromoly frame, main triangle is double-butted; 1-1/8" threadless brazed Chromoly fork
  • Bosses front and rear for cantilever or linear-pull brakes, rack and fender eyelets at the dropouts, eyelets at the crown, and fully threaded through-blade fork eyelets for a front rack
  • Semi-horizontal dropouts with a derailleur hanger for geared or singlespeed drivetrains and/or wheelbase adjustability
  • *Additional items and accessories shown are not included, unless noted above

Frameset

Frame

Surly Pack Rat, Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded. ED coated

Fork

Surly Pack Rat, 4130 CroMoly, lugged & brazed. Sloping crown w/threaded eyelets, tapered & butted curved blades w/mid-blade rack eyelets, dual dropout eyelets

Drivetrain

Crankset

Shimano FC-R460 48 x 34t

Bottom Bracket

Shimano BB-RS500

Front Derailleur

Shimano Tiagra FD-4700

Rear Derailleur

Shimano Tiagra RD-4700 GS, 10 speed, Black

Cassette / Cog

Microshift 10 spd, 11-34t

Chain

KMC X10EL-1

Components

Grips / Bar Tape

-

Handlebar

ProMax Flare-Out 31.8, Black

Stem

ProMax DA-296, Black

Headset

Cane Creek custom 5, 1-1/8" threadless Black

Front Shifter

Shimano Tiagra ST-4700 2x10

Rear Shifter

Shimano Tiagra ST-4700 2x10

Brake Levers

Shimano Tiagra ST-4700

Front Brake

Tektro CR720

Rear Brake

Tektro CR720

Front Rotor

N/A

Rear Rotor

N/A

Centerlock Adapters

N/A

Saddle

WTB Volt Sport

Seatclamp

Surly stainless

Seatpost

ProMax SP-2016, offset

Rear Shock

N/A

Wheels

Wheelset

-

Front Hub

Formula RB51 32h

Rear Hub

Formula RB52 32h

Front Thru Axle / QR

QR

Rear Thru Axle / QR

QR

Rims

Alex Adventurer 2, 32h

Spokes

-

Spoke Nipples

-

Rim Tape / Strips

N/A

Tires

26" - WTB Slick 26x1.5"
650b - Panaracer Pancenti Pari-Moto 650b x 42

Tubes

-

Other

Pedals

N/A

Misc

-

* Specifications are subject to change without notice

650b Geometry

Frame measurements (mm) 52cm 54cm 56cm 58cm
A. BB Drop 55 55 55 55
B. Chainstay Length 415 415 415 415
C. Fork Length - Axle to Crown 390 390 390 390
D. Fork Offset 44 44 44 44
E. Head Tube Angle (deg) 74.0 74.0 74.0 74.0
F. Headtube Length 130 145 160 175
G. Reach 397 402 408 418
H. Seat Tube Angle (deg) 73.5 73.0 72.5 72.0
I. Seat Tube Length - Center to Top 520 540 560 580
J. Stack 518 532 547 561
K. Standover 791 807 823 839.5
L. Top Tube Length (Effective) 550 565 580 595
M. Wheelbase 986 996 1006 1015
         
Component measurements (mm)
Crank Arm Length 170 170 170 175
Handlebar Width 420 420 440 440
Handlebar Rise / Drop - - - -
Stem Length 80 90 90 100
Stem Angle (deg) 6 6 6 6

* All dimensions are preliminary and subject to change


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