Rear wheel bearing backing ring as fitted to Triumph 650 pre-unit & unit twins up to 1970 & 350 / 500 twins up to 1974. Also fits Triumph T150 Tridents 1968-70.
Approximate dimensions are: 1-1/2″ ID, 1-7/8″ OD & 1/16″ thick.
For wheel bearings click here
For grease retaining washers click here