Frameset only! ECR is a plus-tired off-road touring bike designed for routes with way less pavement and a lot more trail. 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)
Frameset - Frame: Surly ECR, 100% Surly 4130 CroMoly steel.
- 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)
27.5+ Geometry ![]()
| XS | S
| M
|
| Reach | 385.0 | 398.0 | 410.5 |
| Stack | 556.0 | 579.5 | 603.0 |
| Head Tube Angle | 69.0° | 69.0° | 69.0° |
| Head Tube Length | 90.0 | 115.0 | 140.0 |
| Seat Tube Length | 346.4 | 406.4 | 457.2 |
| BB Drop | 60.0 | 60.0 | 60.0 |
| Wheelbase | 1052.3 | 1074.0 | 1096.0 |
| Chainstay Length | 435.0 | 435.0 | 435.0 |
| Top Tube Length, Actual | 536.3 | 547.0 | 563.1 |
| Top Tube Length, Effective | 555.0 | 575.0 | 595.0 |
| Seat Tube Angle | 73.0° | 73.0° | 73.0° |
| Standover Height | 726.0 | 766.0 | 802.0 |
| Fork Length | 447.0 | 447.0 | 447.0 |
| Fork Rake | 43.2 | 43.2 | 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.
29+ Geometry ![]()
| M
| L
| XL
|
| Reach | 408.0 | 420.5 | 433.0 |
| Stack | 609.5 | 633.0 | 656.5 |
| Head Tube Angle | 70.0° | 70.0° | 70.0° |
| Head Tube Length | 100.0 | 125.0 | 150.0 |
| Seat Tube Length | 457.2 | 507.9 | 558.7 |
| BB Drop | 80.0 | 80.0 | 80.0 |
| Wheelbase | 1090.0 | 1111.0 | 1132.5 |
| Chainstay Length | 451.0 | 451.0 | 451.0 |
| Top Tube Length, Actual | 560.5 | 580.0 | 600.0 |
| Top Tube Length, Effective | 600.0 | 620.0 | 640.0 |
| Seat Tube Angle | 72.5° | 72.5° | 72.5° |
| Standover Height | 805.0 | 840.0 | 875.0 |
| Fork Length | 468.0 | 468.0 | 468.0 |
| Fork Rake | 43.0 | 43.0 | 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.
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 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")
- Headset Upper (S.H.I.S.): EC34/28.6
- Headset Lower (S.H.I.S.): EC34/30
- Seat Collar: Ø30mm
- Seatpost: Ø27.2mm
- 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.
