Hi. I have issue of continuous failure of Track roller because of excess loading. I am looking for bush bearing with bearing pressure with 150 to 200 MPa @ 0.144 m/sec sliding speed & Friction coefficient shall be max 0.1. I will install a sleeve on the bush bearing & use it as a roller . Can any one suggest an appropriate bearing ? I verified the catalogs of standard bearing manufacturers . The bearing pressure reduces drastically w.r.t sliding speed. The reason may be due to increased heat generation.