{"product_id":"hastings-2-3-4-bore-piston-ring-set-020","title":"Hastings, 2-3\/4\" bore piston ring set. +.020\"","description":"\u003cp\u003eUsed with late style 1950-1973 type pistons with 1\/16\" gray iron parkerized compression rings and the 3-piece flex-vent style chrome oil rings. Also fits 52-56 K; KH; KHK 55\" (900cc) Flathead models.  Std Bore: 2.745\" (69.723mm).  1st ring: 1.6mm.  2nd ring: 1.6mm.  oil ring: 4.75mm.  Note: OEM 1929-1949 pistons are equipped with 3\/32\" (2.3mm) 1st. \u0026amp; 2nd rings and 1\/8\" (3.2mm) oil ring; for these Hastings rings see 1950-1973 Flathead model years. These rings will not fit the 1929-1949 early type pistons.  Tech tip: Piston grooves vs piston rings.  It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.  Tech tip: Piston oversizes.  For each oversize cylinder diameter will increase with .010\" (0.254mm). The standard bore of the cylinder is listed for reference.  (Tech tip information provided by Hastings Manufacturing Company; Inc.)\u003c\/p\u003e","brand":"Hastings","offers":[{"title":"Default Title","offer_id":52760748360008,"sku":"946454","price":52.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2711\/4344\/files\/946454.jpg?v=1779057844","url":"https:\/\/holydeath.com\/fr\/products\/hastings-2-3-4-bore-piston-ring-set-020","provider":"Holy Death Motorcycle Co.","version":"1.0","type":"link"}