<p>A rock bolt (100) for fully resin encapsulated installation in a bore hole (181) has an elongate bar (101) longitudinally extending between a bar leading end (102) and bar trailing end (103). A first wire (110) helically extends about a first bar portion (109) located toward the bar leading end (102). A second wire (120) helically extends about a second bar portion (119) toward the bar trailing end (103). The rock bolt (100) is configured to provide a debonded bar portion (129) between the first bar portion (109) and the second bar portion (119). The debonded bar portion (129) is debonded from resin (141) encapsulating the rock bolt (100) in use, at least upon application of a predetermined service load to the bar (101). 1(01 (00 160 % log ' AV t a -rZO</p>
