Tubing Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded
Rear Dropouts Surly horizontal rear load, with derailleur hanger; 135mm O.L.D.; offset 17.5mm
Brake Compatibility 51mm IS disc mounts frame and fork. Note: please check your fork specifications for specific brake adaptor requirements. Some of our forks use rear brake adaptors!
Braze-ons/extras Dual water bottle mounts, Surly Trip Guide full line guides for brake and derailleurs, fender and rack eyelets
Seatpost diameter 27.2mm
Seatpost clamp diameter 30.0mm (Surly stainless included)
Headset/Steertube 1-1/8″ threadless
Front Derailleur Clamp Diameter High direct mount, (adaptor included)
Bottom bracket shell 100mm wide, standard English threading (1.37″ x 24t)
Chainring Clearance Compact triple: 22-32-44t (with 65mm rim)
Tire Clearance 3.8″ on 82mm rims. Use of 82mm rims requires the use of Surly Mr. Whirly Offset Double crank, O.D.Crank or truncated cassette to avoid tire/chain rub. Standard mountain triple gearing will work with 65mm rims
Fork 447mm axle to crown, tapered straight blade, 4130 CroMoly. 51mm IS disc mount. 135mm-spaced dropouts. 17.5mm offset fork available after market