Tubing 100% Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded
Rear dropouts Proprietary Surly 4130, 135mm spaced
Brake compatibility International Standard disc or cantilever rim-type
Braze-ons Removable cantilever bosses, dual water-bottle mounts, downtube shift cable routing, guides for hydraulic hose or solid housing, ICGS chainguide mount
Seatpost diameter 29.4mm
Seatpost clamp diameter 31.8mm (1-1/4″), Surly Constrictor included
Headset 1-1/8″ threadless
Front derailleur size 31.8mm (1-1/4″) bottom-pull
Bottom bracket shell 73mm wide, threaded English 1.37 x 24t
Tire clearance 26 x 2.7″
Chainring clearance 48t max
Fork Compatibility Geometry is designed around a 100mm 130mm suspension fork. Using shorter or longer forks will compromise intended ride characteristics, i.e. less BB clearance, faster or slower handling, etc. Most of you will choose a suspension fork, so we don’t include a fork with this frame, but we do make a rigid fork for the Instigator
Weight 18″ = 6.61 lbs. (3.0 kg)
Model Size | ST (C-T) | TT (C-C) | TT (Effec.) | HT Angle | ST Angle | BB Drop | CS Length | Wheel Base | S.O. Height | HT Length | FK Length | FK Rake |
---|---|---|---|---|---|---|---|---|---|---|---|---|
inch(mm) | inch(mm) | inch(mm) | degree | degree | inch(mm) | inch(mm) | inch(mm) | inch(mm) | inch(mm) | inch(mm) | inch(mm) | |
x-small | 14.0(355.6) | 21.0(533.5) | 22.0(558.8) | 71.0° | 72.0° | 0.9(24.0) | 16.7(425.0) | 41.1(1044.3) | 28.0(711.9) | 4.3(110.0) | N/A | N/A |
small | 16.0(406.4) | 21.5(546.6) | 22.6(573.9) | 71.0° | 72.0° | 1.0(25.0) | 16.7(425.0) | 41.2(1045.3) | 29.0(737.1) | 4.3(110.0) | N/A | N/A |
medium | 18.0(457.2) | 22.6(574.4) | 23.6(599.3) | 71.0° | 72.0° | 1.0(25.0) | 16.7(425.0) | 41.9(1064.7) | 30.4(773.0) | 4.3(110.0) | N/A | N/A |
large | 20.0(508.0) | 23.8(604.1) | 24.6(624.4) | 71.0° | 72.0° | 1.0(25.0) | 16.7(425.0) | 43.1(1096.0) | 32.0(813.7) | 5.1(130.0) | N/A | N/A |