1-1/4" x 1/2" Ceramic Hybrid Quarter Midget Rear Axle Bearing - 1-1/4" Ceramic Hybrid Quarter Midget Rear Axle Bearing 1-1/4” x 2-1/4" x 1/2" rear axle bearing (standard width bearing) Ceramic Hybrid Bearings have Steel races and Ceramic Balls. In ball form, ceramic is harder than steel and because ceramic balls are non-porous they are virtually frictionless and capable of spinning faster and with less drag than steel balls as well as being more durable.