A roller bearing, comprising: at least one roller; an outer ring surrounding an axis and comprising an outer wall; two side walls extending away from the outer wall, defining a cavity therebetween for receiving the at least one roller, and each of the two side walls having an outer edge located at an intersection of an axially-extending surface and a radially-extending surface at a location facing the cavity and farthest from the outer wall; and a first curved crown extending inward from at least one of the two side walls contacting the at least one roller to reduce wear to the outer edge, wherein the first curved crown comprises a portion of a circle having a radius and an apex facing the at least one roller; and an inner ring surrounding the axis, located radially inward from the outer ring, wherein the inner ring comprises: an outer wall; two side walls extending away from the outer wall, defining a cavity therebetween for receiving the at least one roller, and each of the two side walls having an outer edge located at an intersection of an axially-extending surface and a radially-extending surface at a location facing the cavity and farthest from the outer wall; and a second curved crown extending inward from at least one of the two side walls contacting the at least one roller to reduce wear of the outer edge, wherein the second curved crown comprises a portion of a circle having a radius and an apex facing the at least one roller; the at least one roller being at least partially housed by a cage, wherein the cage houses the at least one roller between the outer ring and the inner ring; the second curved crown contacts the at least one roller at a contact ellipse, wherein the contact ellipse is an area located at a midsection of the two side walls and away from the outer edge. at least one roller; an outer ring surrounding an axis and comprising an outer wall; two side walls extending away from the outer wall, defining a cavity therebetween for receiving the at least one roller, and each of the two side walls having an outer edge located at an intersection of an axially-extending surface and a radially-extending surface at a location facing the cavity and farthest from the outer wall; and a first curved crown extending inward from at least one of the two side walls contacting the at least one roller to reduce wear to the outer edge, wherein the first curved crown comprises a portion of a circle having a radius and an apex facing the at least one roller; and an inner ring surrounding the axis, located radially inward from the outer ring, wherein the inner ring comprises: an outer wall; two side walls extending away from the outer wall, defining a cavity therebetween for receiving the at least one roller, and each of the two side walls having an outer edge located at an intersection of an axially-extending surface and a radially-extending surface at a location facing the cavity and farthest from the outer wall; and a second curved crown extending inward from at least one of the two side walls contacting the at least one roller to reduce wear of the outer edge, wherein the second curved crown comprises a portion of a circle having a radius and an apex facing the at least one roller; the at least one roller being at least partially housed by a cage, wherein the cage houses the at least one roller between the outer ring and the inner ring; the second curved crown contacts the at least one roller at a contact ellipse, wherein the contact ellipse is an area located at a midsection of the two side walls and away from the outer edge. an outer wall; two side walls extending away from the outer wall, defining a cavity therebetween for receiving the at least one roller, and each of the two side walls having an outer edge located at an intersection of an axially-extending surface and a radially-extending surface at a location facing the cavity and farthest from the outer wall; and a second curved crown extending inward from at least one of the two side walls contacting the at least one roller to reduce wear of the outer edge, wherein the second curved crown comprises a portion of a circle having a radius and an apex facing the at least one roller; the at least one roller being at least partially housed by a cage, wherein the cage houses the at least one roller between the outer ring and the inner ring; the second curved crown contacts the at least one roller at a contact ellipse, wherein the contact ellipse is an area located at a midsection of the two side walls and away from the outer edge.