a one - piece replacement sleeve is provided for installation on a conveyor belt roller to prolong the roller &# 39 ; s wear life . the cylindrical , split sleeve has a central bore to receive the roller and circumferential grooves in the outer surface to receive fastening circlets to fasten the sleeve to the roller . the sleeve has two radial slits oppositely disposed and extending axially along the entire length of the sleeve to facilitate easy installation and replacement of the sleeve . the slits allow the sleeve to be installed on the roller without the need to remove the roller from its journal mountings . the slits also allow the worn sleeve to be quickly and easily removed by cutting or otherwise removing the fastening circlets . since the sleeve is formed of one piece of material , the sleeve wears concentrically , reducing vibrations in the conveyor belt assembly . the sleeve provides significant improvements over roller discs and two - piece roller sleeves in the prior art .