Tubing
Surly 4130 CroMoly steel. Custom double-butted trumpet tube main triangle. TIG-welded. ED coated.
Rear Dropouts
12mm horizontal and vertical slotted with derailleur hanger and Surly “Gnot-Boost” 135, 142, and/or 148mm hub spacing compatibility
Brake Compatibility
51mm I.S. disc caliper mounts, 203mm max rotor size
Braze-ons/extras
Two bottle-mounts on all sizes, dropper post routing, rach and fender mounts
Seatpost diameter
30.9mm
Seatpost clamp diameter
33.1mm
Headset/Steerer Tube
ZS44/28.6 upper, EC44/30 lower
Front Derailleur Clamp Diameter
34.9mm, high direct-mount
Bottom bracket shell
73mm
Chainring Clearance
28t 1x, 30t Boost 1x, 24/36t Boost 2x
Tire Clearance
29 x 3.0", individual tire and rim combos affect tire clearance
Fork
29+ 120mm travel suspension fork compatible (550mm A-to-C max)
Surly Thru Axle
HU0138 Surly 15x110 Front Thru Axle
HU0134 Surly 12x142/148 Rear Thru Axle
Color
Bruised Ego Purple (Complete Bike and Frameset)
Dark Black (Frameset Only)