Surly Instigator Cr-Mo Instigator Fork. Heavy Duty Rigid forks. Designed to replace a 100mm suspension fork. Thick walled single butted 4130 Cr-Mo.31.8 to 28.6mm tapered straight Cr-Mo blades. Fat tyre &40;up to 2.7”&41; clearance. Disc mount & removable Canti pivots. Axle to Crown: 447mm Rake: 43mm