Tubing
Surly 4130 CroMoly Steel ‘Natch tubing
Rear Dropouts
Horizontal slotted with derailleur hanger; Surly “Gnot Boost” 135, 142, or 148mm hub spacing compatibility, threaded fender eyelets
Brake Compatibility
51mm I.S. disc caliper mounts, 203mm max rotor size
Braze-ons/extras
Two bottle-mounts on XS–M, three bottle-mounts on LG–XL, dropper post routing, rack 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
32t Boost 1x, 24/36t Boost 2x, 28t 1x, 24/34t 2x
Tire Clearance
27.5 x 3.0˝ and 29 x 2.5˝, individual tire and rim combos affect tire clearance
Fork
27.5+ 140mm travel suspension fork compatible (551mm A-to-C max)
Surly Thru Axle
HU0138 Surly 15x110 Front Thru Axle
HU0134 Surly 12x142/148 Rear Thru Axle
Color
Blue Porta Potty (Complete Bike and Frameset)
Lemon Lime Soda (Frameset Only)
Hi-Viz Black (Complete Bike and Frameset)