Surly Bikes
Pack Rat is a short to mid-distance road bike for carrying lighter loads for keeping all your stuff within arm’s reach.
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).
Bike Capabilities
- 5/5 with Front Loading Cargo
- 4/5 with Pavement Touring
- 5/5 with Commuting
- 5/5 with Rack Compatibility
NOTE: You can ride your bike wherever the hell you want, but this is what we think this bike is best at.
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Where to Buy
Specifications
Build Kit
Frameset
| Frame |
Surly Pack Rat, Surly 4130 CroMoly steel.
Surly Pack Rat, Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded. ED coated |
|---|---|
| Fork |
Surly Pack Rat, 4130 CroMoly, lugged & brazed.
Surly Pack Rat, 4130 CroMoly, lugged & brazed. Sloping crown w/threaded eyelets, tapered & butted curved blades w/mid-blade rack eyelets, dual dropout eyelets |
| Seatpost Clamp | Surly stainless, 30.0mm |
Components
| Headset | Cane Creek custom 5, 1-1/8" |
|---|---|
| Brakes | Tektro CR720 |
| Brake Levers | Shimano Tiagra ST-4700 |
| Shifters | Shimano Tiagra ST-4700 |
| Stem | ProMax 31.8 4 bolt |
| Handlebar | ProMax Flare-Out |
| Grip/Tape | Black Cork |
| Saddle | WTB Volt Sport |
| Seatpost | ProMax 27.2 350L offset |
| Rack | Surly 8-Pack Rack |
Drivetrain
| Crankset | Shimano FC-R460 48x34t |
|---|---|
| Bottom Bracket | Shimano BB-RS500 |
| Front Derailleur | Shimano Tiagra FD-4700 |
| Rear Derailleur | Shimano Tiagra RD-4700 GS |
| Cog or cogset | Microshift 10 spd, 11-34t |
| Chain | KMC X10 |
Wheels
| Front Hub | Formula RB-51 32h QR |
|---|---|
| Rear Hub | Formula RB-52 32h QR |
| Rims | Alex Adventurer 2, Tubeless Ready |
| Tires | 26/650b- Panaracer Pasela 26x1.5, 650b x 42 |
Geometry
units:
- in
- mm
| 38cm | 42cm | 46cm | 50cm | |
|---|---|---|---|---|
| Reach | 14.8 377 | 14.9 379 | 15.2 386 | 15.4 392 |
| Stack | 17.9 455 | 18.5 471 | 19.1 484 | 19.6 498 |
| Head Tube Angle | 72.5° | 72.5° | 72.5° | 72.5° |
| Head Tube Length | 3.5 90 | 4.1 105 | 4.7 120 | 5.3 135 |
| Seat Tube Length | 15.0 380 | 16.5 420 | 18.1 460 | 19.7 500 |
| BB Drop | 1.8 45 | 1.8 45 | 1.8 45 | 1.8 45 |
| Wheelbase | 37.8 960 | 37.9 963 | 38.0 965 | 38.4 975 |
| Chainstay Length | 16.1 410 | 16.1 410 | 16.1 410 | 16.1 410 |
| Top Tube Length, Actual | 18.9 479.6 | 19.3 490.2 | 20.0 508 | 20.7 527 |
| Top Tube Length, Effective | 19.5 495 | 19.9 505 | 20.5 520 | 21.1 535 |
| Seat Tube Angle | 75.5° | 75.5° | 75.5° | 75.5° |
| Standover Height | 27.0 685 | 28.0 711.4 | 29.0 736 | 30.0 762 |
| Stem Length | 2.8 70 | 2.8 70 | 2.8 70 | 3.1 80 |
| Stem Angle | 6° | 6° | 6° | 6° |
| Handlebar Width | 15.0 380 | 15.0 380 | 15.7 400 | 15.7 400 |
| Crank Length | 6.5 165 | 6.5 165 | 6.5 165 | 6.7 170 |
| Fork Length | 14.6 370 | 14.6 370 | 14.6 370 | 14.6 370 |
| Fork Rake | 1.7 44 | 1.7 44 | 1.7 44 | 1.7 44 |
| 52cm | 54cm | 56cm | 58cm | |
|---|---|---|---|---|
| Reach | 15.6 397 | 15.8 402 | 16.1 408 | 16.5 418 |
| Stack | 20.4 518 | 20.9 532 | 21.5 547 | 22.1 561 |
| Head Tube Angle | 74.0° | 74.0° | 74.0° | 74.0° |
| Head Tube Length | 5.1 130 | 5.7 145 | 6.3 160 | 6.9 175 |
| Seat Tube Length | 20.5 520 | 21.3 540 | 22.0 560 | 22.8 580 |
| BB Drop | 2.2 55 | 2.2 55 | 2.2 55 | 2.2 55 |
| Wheelbase | 38.8 986 | 39.2 996 | 39.6 1006 | 40.0 1015 |
| Chainstay Length | 16.3 415 | 16.3 415 | 16.3 415 | 16.3 415 |
| Top Tube Length, Actual | 21.3 541 | 21.9 557 | 22.5 572 | 23.2 588.5 |
| Top Tube Length, Effective | 21.7 550 | 22.2 565 | 22.8 580 | 23.4 595 |
| Seat Tube Angle | 73.5° | 73.0° | 72.5° | 72.0° |
| Standover Height | 31.1 791 | 31.8 807 | 32.4 823 | 33.1 839.5 |
| Stem Length | 3.1 80 | 3.5 90 | 3.5 90 | 3.9 100 |
| Stem Angle | 6° | 6° | 6° | 6° |
| Handlebar Width | 16.5 420 | 16.5 420 | 17.3 440 | 17.3 440 |
| Crank Length | 6.7 170 | 6.7 170 | 6.9 175 | 6.9 175 |
| Fork Length | 15.4 390 | 15.4 390 | 15.4 390 | 15.4 390 |
| Fork Rake | 1.7 44 | 1.7 44 | 1.7 44 | 1.7 44 |
Frame Specifications
| 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 | Semi-horizontal |
| 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 | Ø34mm |
| Steerer Tube | Ø28.6mm (1-1/8") |
| Crown Race | Ø30mm (1-1/8") |
| Stock Headset Upper (S.H.I.S.) | EC34/28.6 |
| Stock Headset Lower (S.H.I.S.) | EC34/30 |
| Seat Collar | Ø30mm |
| Seat Post | Ø27.2mm |
| 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] | N/A |
| Bottle Mounts Frame | 1 Standard + 2 Three-Pack |
| Bottle Mounts Fork | N/A |
| Rack Mounts Frame | Yes (upper and lower threaded) |
| Rack Mounts Fork | Yes (upper and mid-blade threaded) |
| Fender Mounts Frame | Yes |
| Fender Mounts Fork | Yes |
| Other Features | Downtube mounted shifter bosses |
[1] Different tire and rim combinations will result in different clearances.
[2] Depending on drivetrain configuration, tire clearance may be limited by the chain and not frame.
[3] Listed chainring clearance is worst case scenario. Clearances vary widely depending on components and configurations.
[4] Suspension fork length listed at full extension (not at sag)
FAQ & Reviews
Support
Downloads
- Pack Rat Frame Sheet
[pdf] - 803KB - Pack Rat Fork Instructions
[pdf] - 169KB - Surly Bike Sizing Chart
[pdf] - 308KB
Frame Warranty
LIMITED WARRANTY
This Surly product is warranted against defects in materials and workmanship for three years from the date of retail purchase of the product, subject to the limitations detailed below. Save your dated receipt for proof of purchase.
This warranty does NOT cover the following:
- Damage due to improper assembly or follow-up maintenance or lack of skill, competence or experience of the user or assembler
- Products that have been modified, neglected, used in competition or for commercial purposes, misused or abused, involved in accidents or anything other than normal use
- Installation of components, parts or accessories not originally intended for or compatible with bicycle as sold
- Damage or deterioration to the paint, surface finish, aesthetics or appearance of the product
- Normal wear and tear
- Labor required to remove and/or refit and re-adjust the product within the bicycle assembly
This limited warranty is expressly limited to the repair or replacement of a defective product, at the option of Surly, and is the sole remedy of the warranty. This limited warranty applies only to the original purchaser of the Surly product and is not transferrable. This warranty applies only to products purchased through an authorized dealer or distributor. In no event shall Surly be liable for any loss, inconvenience or damage, whether direct, incidental, consequential, or otherwise resulting from breach of any express or implied warranty or condition, of merchantability, fitness for a particular purpose, or otherwise with respect to our products except as set forth herein.
This limited warranty gives the consumer specific legal rights, and those rights and other rights may vary from place to place. This limited warranty does not affect your statutory rights.
TO THE EXTENT NOT PROHIBITED BY LAW, THESE WARRANTIES ARE EXCLUSIVE AND THERE ARE NO OTHER EXPRESS OR IMPLIED WARRANTIES OR CONDITIONS INCLUDING WARRANTIES OR CONDITIONS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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