Reading the codeThe code gives the section and length. 11M-800 is a 11M section wide angle belt 800mm long. Match both from your old belt.
Wide angle pulleys onlyWR belts have a 60° profile and need matching wide angle pulleys. They won’t run correctly in standard V-belt pulleys, and standard V-belts won’t fit wide angle pulleys.
Check the sectionThe number in the section, such as 11M, relates to the belt’s size. If your belt is noticeably wider or narrower, see the other WR sections.