Surly 2021 ECR 27.5+ Frame Fork Set


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Surly 2021 ECR 27.5+ Frame Fork Set. 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.

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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)
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 (Ø28.6mm)

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

Manufacturer website



Surly is an American bicycle steel frame producer based in Minnesota. The manufacturer offers us a wide range of bikes, from fat bikes to travel bikes and fixed gears. Also, in chromo, the tubing is unique for each model and size. Reliability and versatility are essential for this brand. Surly slogan “We make serious steel bikes for people who don’t take themselves too seriously.”

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