Experience next-level braking performance and maximize the braking power of your Shimano Dura Ace / Ultegra / 105 / GRX / Tiagra / XTR M9100 calipers with Kogel replacement disc brake pads.  Shimano Dura Ace / Ultegra / 105 / GRX / Tiagra / XTR (12spd) Road Replacement Disc Brake Pads The Kratos compound is best durability in wet environments and intense braking. These pads reach maximum potential with some heat buildup from cornering and descending.