The stock 2x bolts will not work

Air Tune System: Minimises contact surfaces to maximise back ventilation

Patented Lock-On system prevents twisting and provides rider security

Allows for 180mm rotors on 160mm post mounts

Clamp Diameter: 35mm / 31

Shimano IS Frame Or Fork To Post Caliper Brake Mount - R 160-160mm - MA Advanced Level PDP|PLP|Brake Rotor Type The stock 2x bolts willIf you are in need of an IS(International Standard) Caliper Brake Mount then these Shimano options are an excellent choice. These are required if your frame or fork has an IS mount and to fit your caliper and or adjust your rotor size. Features: IS: 51mm International Standard Shimano Post to Rear Mount Disc Brake adaptor Precision engineered disc calliper mount adaptor Interchangeable Mounting accessories included F 160 160mm: Accommodates 160mm