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Bikes. Parts. Chaos.

Trolling the Limits of Exploration

Troll is the expedition touring bike that started us down the winding, mostly unpaved path of dirt road touring. It’s fully-equipped to get you out there — way out there — for very long periods of time and its highly-versatile dropout design allows you to do so in a variety of ways. Singlespeed? Rohloff? Pulling a trailer? Yep. All of that and so much more.

Chances are, Troll can handle most of the ideas that are bouncing around your noggin. Feel like riding from Alaska to the tip of South America? You can load everything you need on Troll and still have plenty of space for “souvenirs.” Troll can handle it even if you don’t think you can.

“Troll believes in you, so you don’t have to."

  • Compatible with both disc and rim brakes
  • All the accessory barnacles you could ever possibly ask for including rack and fender, multiple three-pack mounts and mid-blade.
  • Gnot-Boost rear spacing with Rohloff torque arm slot and Bill/Ted trailer mount
  • Clearance for 26" x 3" tires (26 x 2.8" with fenders)

Loaded Troll side view
Loaded Troll riding through water
Loaded Troll riding on path surrounded by sand
Troll bikes and gear next to boats and fishing nets
Loaded Troll riding on dirt road near cattle


Troll 2017 Geometry

Select a few bike sizes to compare.

SIZE XS S M L XL (Frameset Only)
Reach 14.6 371 15.5 393 16.3 415 17.0 431 17.6 446
Stack 21.7 551 22.1 561 22.4 570 23.0 585 23.8 604
Head Tube Angle 71.0° 71.0° 71.0° 71.0° 71.0°
Head Tube Length 4.9 125 5.3 135 5.7 145 6.3 160 7.1 180
Seat Tube Length 13.2 336 16.0 406 18.0 457 20.0 508 22.0 559
BB Drop 1.6 40 1.6 40 1.6 40 1.6 40 1.6 40
Wheelbase 40.0 1016 41.0 1041 42.0 1066 42.8 1086 43.6 1108
Chainstay Length 16.7 425 16.7 425 16.7 425 16.7 425 16.7 425
Top Tube Length, Actual 20.9 530.6 21.5 546.7 22.4 568.1 23.2 589.0 24.0 608.6
Top Tube Length, Effective 21.5 545 22.4 570 23.4 595 24.2 615 24.8 630
Seat Tube Angle 73.0° 73.0° 73.0° 73.0° 73.0°
Standover Height 28.3 720 29.5 749 30.6 778 31.9 809 33.2 843.0
Stem Length 3.5 90 3.5 90 3.9 100 4.3 110
Stem Angle
Handlebar Width 27.0 685 27.0 685 28.9 735 28.9 735
Crank Length 6.7 170 6.7 170 6.9 175 6.9 175
Fork Length 16.5 420 16.5 420 16.5 420 16.5 420 16.5 420
Fork Rake 1.7 43 1.7 43 1.7 43 1.7 43 1.7 43
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, TIG welded, ED coated

Rear Dropout Configuration

Horizontal slotted with optional vertical dumpout

Rear Hub Spacing

"Gnot-Boost" 145mm

12 x 142mm or 12 x 148mm (axle not inlcuded)

10 x 135mm with Surly 10/12 Adapter Washers (included)

Front Hub Spacing

10 x 100mm

Rear Brake

Disc - 51mm I.S. (160mm max rotor) [4] 

Rim - Canti (removable posts)

Front Brake

Disc - 51mm I.S. (203mm max rotor)

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)

High direct mount top-pull (Ø28.6mm)

26mm offset adapter (included) for 142 or 135mm rear hub spacing

29mm offset adapter (not included) for 148mm rear hub spacing

Max Chainring (CL)[3]

1x (Mtn): 42T

2x (Mtn): 34/44T

3x (Mtn): 24/36/48T

1x (Boost): 44T

2x (Boost): 40/46T

Bottom Bracket

73mm threaded (1.37" x 24TPI)

Tire Clearance Frame [1]/[2]

26 x 3.0" (26 x 2.8" with fenders)

Tire Clearance Fork [1]

26 x 3.0" (26 x 2.8" with fenders)

Rigid Fork Spec

420 x 43mm

Max Suspension Fork Length [4]


Bottle Mounts Frame

2 Three-Pack (XS)

1 Standard + 2 Three-Pack (S - XL)

Bottle Mounts Fork

4 Three-Pack

Rack Mounts Frame

Yes (upper and lower threaded)

Rack Mounts Fork

Yes (upper, lower, and mid-blade threaded)

Fender Mounts Frame


Fender Mounts Fork


Other Features

Dedicated Rohloff cable routing and mount for OEM 2 axle plate

Dedicated Surly Trailer mounts

  • [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) 
    [5] Rear disc brake requires Surly’s proprietary brake mount adapter.


Frame 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.