Included: 1 x Mountain Bicycle Disc Brake. Front: Suitable for discs: 140/160/180mm A-pillar size: 75mm (universal for disc brakes) B-pillar size: 51mm (universal for disc brakes). Rear: Suitable for discs: 140/160/180mm A-pillar size: 75mm (universal for disc brakes) B-pillar size: 51mm (universal for disc brakes).