Piston ring compressors for British Twins

Piston rings have a hard enough time without getting beat up during installation. If you have a 2 or 3 piece oil ring you MUST use ring compressors to prevent damage to the ring. It also makes putting your cylinder on easier and almost effortless. Don't break a ring during installation! Most rings are only sold in sets! For 650 Triumph twins use the 70-75mm ring compressors. For 750 Triumph twins and big bore kits use the 75-80mm ring compressors. For unit 500 pistons use 65-70mm ring compressors. For Pre Unit 500 use 60-65mm ring compressors. 60mm - 65mm = 2.36" - 2.55" 65mm - 70mm = 2.55" - 2.75" 70mm - 75mm = 2.75" - 2.95" 75mm - 80mm = 2.95" - 3.14" These are sold in pairs, and were imported from England.