Surly ECR 29+

Surly ECR 29+
  • Color: Tank Green
  • Color: Tank Green
  • Color: Tank Green
  • Color: Tank Green
  • Color: Tank Green
Tank Green
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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)

Plus-size rims and tires

Wider than standard yet narrower than fat, plus-size rims and tires hit the sweet spot in grip, stability, and speed, giving you more confidence on technical terrain. Compared to a standard tire you’ll feel grip in places you wouldn’t expect thanks to a bigger contact patch and greater rollover clearance. More air volume allows lower tire pressures which softens bumps and increases float on sand or snow. Whether you’re a novice or an expert, the benefits of plus-size tires and rims will amplify your mountain biking fun.

WARNING: This product can expose you to chemicals, including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to


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
Headset Cane Creek, 40 series, 1-1/8"
Axles Front: Quick release
Rear: "Gnot-Boost" 145mm/12 x 142mm or 12 x 148mm (axle is included)
Rims/Wheels WTB Scraper i40 TSC
Hubs OE 32h
Tires Surly Knard 29x3.0, 60TPI
Crankset SRAM NX Eagle
Chainrings 30T
Bottom Bracket SRAM Powerspline 118/73
Chain SRAM NX Eagle
Rear Derailleur SRAM NX Eagle
Cassette/Rear Cogs SRAM Eagle 11-50T, 12 speed
Shifters SRAM NX Eagle
Handlebars Surly Moloko
Tape/Grips Velo Lock-On
Stem ProMax 4 bolt, 31.8
Brake Levers Avid FR-5
Brakes Avid BB7, Centerline rotors. 180/160mm front & rear
Saddle WTB Volt Sport
Seat Post Promax 27.2, 350L, Offset

* Subject to change without notice.

Part Numbers

Option UPC MPN Store SKU
Tank Green / Medium 708752300644 BK2003 SUR34449691M
Tank Green / Large 708752300668 BK2004 SUR33195778E
Tank Green / X-Large 708752300682 BK2005 SUR34713675E