The K&N Round Filter helps boost performance by opening up the intake system, increasing air flow into the engine and allowing it to run more efficiently. The retro round style adds a vintage touch to any Triumph Classic or Cruiser. K&N Rounds Filters fit perfectly with British Customs Air Box removal kit. All K&N Filters are washable and reusable.
Air Filter (I.D.): 2-1/8" (54mm)
Injector (I.D.): 2-1/16" (52.5mm)
Air Filter Diameter: 3-1/2x 5
Note: These are not stock replacements filters. You must remove your air box prior to installation.