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Our Go-To Bikepacking Bike

Sometimes the only way to break the humdrum of life is with a bike ride off the beaten path. Sometimes just for a quick overnighter, sometimes a month and half fully-loaded through nine countries. ECR is our answer to those sometimes.

As our flagship bikepacking rig, ECR is adaptable to frame bags for the minimalist approach, as well as racks and bags to maximize gear-hauling potential. ECR is most at home when your tour starts on dirt and gets more technical from there.

  • Two wheel platforms available: 27.5+ for frame sizes XS–M and 29+ for M–XL
  • 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 27.5" x 3" (XS–M) or 29” x 3” (M–XL) tires (with or without fenders)
ECR complete side view next to wood pile
ECR seat tube decal
ECR gravel skidding
ECR fork and dropout detail
ECR rear tire clearance
ECR riding over a wooden bridge

Specifications

2018 ECR 29 Geometry
units:

Select a few bike sizes to compare.

SIZE M L XL
Reach 16.1 408.0 16.6 420.5 17.0 433.0
Stack 24.0 609.5 24.9 633.0 25.8 656.5
Head Tube Angle 70.0° 70.0° 70.0°
Head Tube Length 3.9 100.0 4.9 125.0 5.9 150.0
Seat Tube Length 18.0 457.2 20.0 507.9 22.0 558.7
BB Drop 3.1 80.0 3.1 80.0 3.1 80.0
Wheelbase 42.9 1090.0 43.7 1111.0 44.6 1132.5
Chainstay Length 17.8 451.0 17.8 451.0 17.8 451.0
Top Tube Length, Actual 22.1 560.5 22.8 580.0 23.6 600.0
Top Tube Length, Effective 23.6 600.0 24.4 620.0 25.2 640.0
Seat Tube Angle 72.5° 72.5° 72.5°
Standover Height 31.7 805.0 33.1 840.0 34.4 875.0
Stem Length 2.8 70 2.8 70 3.1 80
Stem Angle 6° 6° 6°
Handlebar Width 28.9 735 28.9 735 28.9 735
Crank Length 6.9 175 6.9 175 6.9 175
Fork Length 18.4 468.0 18.4 468.0 18.4 468.0
Fork Rake 1.7 43.0 1.7 43.0 1.7 43.0

*1 Standover is measured from the top of the TT, at the center, with a tire measuring approximately Ø775mm *2 St angle is the effective ST angle.

Select a few bike sizes to compare.

SIZE XS S M
Reach 15.2 385.0 15.7 398.0 16.2 410.5
Stack 21.9 556.0 22.8 579.5 23.7 603.0
Head Tube Angle 69.0° 69.0° 69.0°
Head Tube Length 3.5 90.0 4.5 115.0 5.5 140.0
Seat Tube Length 13.6 346.4 16.0 406.4 18.0 457.2
BB Drop 2.4 60.0 2.4 60.0 2.4 60.0
Wheelbase 41.4 1052.3 42.3 1074.0 43.1 1096.0
Chainstay Length 17.1 435.0 17.1 435.0 17.1 435.0
Top Tube Length, Actual 21.1 536.3 21.5 547.0 22.2 563.1
Top Tube Length, Effective 21.9 555.0 22.6 575.0 23.4 595.0
Seat Tube Angle 73.0° 73.0° 73.0°
Standover Height 28.6 726.0 30.2 766.0 31.6 802.0
Stem Length 2.36 60 2.36 60 2.75 70
Stem Angle 6° 6° 6°
Handlebar Width 29.9 685 29.9 685 28.9 735
Crank Length 6.7 170 6.7 170 6.9 175
Fork Length 17.6 447.0 17.6 447.0 17.6 447.0
Fork Rake 1.7 43.2 1.7 43.2 1.7 43.2

*1 Standover is measured from the top of the TT, at the center, with a tire measuring approximately Ø735mm *2 St angle is the effective ST angle.

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 is included)

10 x 135mm with Surly 10/12 Adapter Washers (not included)

Front Hub Spacing

10 x 100mm

Rear Brake

Disc - 51mm I.S. (160mm max rotor) [5] 

Front Brake

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

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

Seatpost

Ø27.2mm

Front Derailleur (Clamp)

High direct-mount top-pull (Ø31.8mm)

26mm offset adapter (not included) for 142 or 135mm rear hub spacing

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

Max Chainring (CL)[3]

1x (Mtn): 34T

2x (Mtn): 26/39T

3x (Mtn): 22/34/44T

Bottom Bracket

73mm threaded (1.37" x 24TPI)

Tire Clearance Frame [1]/[2]

27.5+: 27.5 x 3.0" (with or without fenders) 

27.5+: 29 x 2.6" (with or without fenders)

29+: 29 x 3.0" (with or without fenders)

Tire Clearance Fork [1]

27.5+: 27.5 x 3.0" (without fenders)

27.5+: 27.5 x 2.8" (without fenders)

27.5+: 29 x 2.6" (without fenders)

27.5+: 29 x 2.5"(with fenders) 

29+: 29 x 3.0" (with or without fenders)

Rigid Fork Spec

27.5in: 447 x 43mm

29in: 468 x 43mm

Max Suspension Fork Length [4]

N/A

Bottle Mounts Frame

27.5in: 2 Three-Pack

29in: 2 Standard + 1 Three-Pack

Bottle Mounts Fork

27.5in: 4 Three-Pack

29in: 4 Three-Pack

Rack Mounts Frame

Yes (upper and lower threaded)

Rack Mounts Fork

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

Fender Mounts Frame

Yes

Fender Mounts Fork

Yes

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.

Support

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.