Hayes Dominion A2 Mountain Bike Disc BrakeReady for fast and fun MTB adventures, this disc brake offers smooth and consistent braking performance on the most unpredictable off-road rides. It features a standard sized brake lever with tool-free reach adjust, which means that you can fine-tune it to perfectly match your hand size, riding preferences as well as the terrain conditions. Hayes has also equipped this standard sized model with a two-piston caliper that provides fast and reliable braking as you blast across the rock garden, tree roots and debris at speed. Expanding on the award-winning Dominion A4. The, Dominion A2, targets Cross Country and Trail riders. Dominion A2 features a two-piston caliper. Dominion A2 includes all the performance from the Dominion A4, utilizing a compact, two-piston caliper. Dominion A2 features the proprietary QuickBite² system for fast and consistent burnish, coupled with our D-Series rotor (sold separately) to manage the heat with less braking noise. Features: Use: Cross Country, MTB Piston: 2-piston Type: Disc brake Fluid: DOT 5.1Lever Size: Standard Hayes: Hayes K2 hose Rotors: Sold separately Caliper Mount: 74mm post mount Pad Type: T106 Semi-Metallic (Included), T100 Sintered Metallic (Included) Reach Adjust:Tool-free reach adjust Pad Contact Adjust: Tooled Lever Pivot: Sealed cartridge bearingsCaliper Alignment: CrosshairWeight: 303gBuy Hayes Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.