Jordan and Gamedev are right. Ideally you would want to separate that mesh into modular chunks anyway for a number of reasons. You'd only have to do like 2-3 seperate pieces.
Using the mesh on simple things is ok. More complicated geometry though, it's not a good idea. If you find yourself making more than a few collision primitives for a mesh, you should re-consider how it's built. In particular, your ring could be broken up into a few modular chunks, each with a few collision primitives each.…