Tubing: Surly 4130 CroMoly steel. TIG-welded. Main triangle double-butted
Seatpost diameter: 27.2mm
Seatpost clamp: 30.0mm Surly stainless, included
Headset/stem: 1-1/8" threadless
Front Derailleur Clamp: 1 1/8" (28.6mm), top pull
Bottom bracket: 73mm shell width, threaded standard English (1.37" x 24t)
Braze-ons/extras: Full-length housing line guides for derailleurs and brakes; 2 sets of water bottle cage mounts, removable post cantilever pivots; upper seatstay threaded barrels,mid-and low-blade fully threaded through-blade fork eyelets; threaded holes for racks, fenders and trailer mounting nuts; Rohloff OEM2 axle plate mounting slot
Brake compatibility: Disc and rim brake compatible. Note: rear disc brake is limited to 165mm maximum rotor diameter and requires the use of Surly caliper adapter
Tire clearance: 26 x 2.5" with rear wheel fully forward. Clearance for 2.7" tire with wheel farther back
Chainring clearance: 24/36/48t
Hub compatibility: 100mm O.L.D. front, 135mm O.L.D. rear
Fork: TIG-welded 4130 CroMoly, 100mm suspension corrected, tapered straight blade. Low- and mid-blade fully threaded through-blade rack eyelets; fender mount eyelets at dropout; 1-18" x 260mm threadless steer tube, 51mm disc mount, removable cantilever pivots, line/housing guides
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