Surly Bikes
ECR is a plus-tired dirt touring bike designed for routes with way less pavement and a lot more trail.
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)
Bike Capabilities
- 5/5 with Bikepacking
- 4/5 with Singletrack
- 5/5 with Tire Clearance
- 3/5 with Commuting
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 ECR, 100% Surly 4130 CroMoly steel.
Surly ECR, 100% Surly 4130 CroMoly steel. ED coated. Double-butted main triangle. TIG-welded |
|---|---|
| Fork | Surly ECR, TIG-welded custom-butted 4130 CroMoly, non-suspension corrected, 1-1/8˝ steerer tube, 203mm disc brake clearance |
| Seatpost Clamp | Surly Stainless, 30.0mm (Surly stainless included) |
Components
| Headset | Cane Creek, 40 series, 1-1/8" |
|---|---|
| Brakes | Avid BB7, Centerline rotors. 180/160mm front & rear |
| Brake Levers | Avid FR-5 |
| Shifters | SRAM NX Eagle |
| Stem | ProMax 4 bolt, 31.8 |
| Handlebar | Surly Moloko |
| Grips | Velo Lock-On |
| Saddle | WTB Volt Sport |
| Seatpost | Promax 27.2, 350L, Offset |
Drivetrain
| Crankset | SRAM NX Eagle 30T |
|---|---|
| Bottom Bracket | SRAM Powerspline 118/73 |
| Front Derailleur | None |
| Rear Derailleur | SRAM NX Eagle |
| Cog or cogset | SRAM Eagle 11-50T, 12 speed |
| Chain | SRAM NX Eagle |
Wheels
| Front Hub | OE 32h QR |
|---|---|
| Rear Hub | OE 32h Thru axle |
| Rims | WTB Scraper i40 TSC |
| Tires | Surly Knard 29x3.0", 33TPI, Tubeless ready |
Geometry
units:
- in
- mm
| 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 |
| 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 |
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, 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) [5] Rim - Canti (removable posts) |
| Front Brake | Disc - 51mm I.S. (203mm max rotor) 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 |
| Seatpost | Ø27.2mm |
| 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): 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: 2 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.
FAQ & Reviews
Support
Downloads
- Surly Bike Sizing Chart
[pdf] - 308KB - ECR Frame Sheet
[pdf] - 424KB - ECR Fork Instructions 29"
[pdf] - 551KB - ECR Fork Instructions 27.5"
[pdf] - 551KB
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.
