Abstract: A retainer for securing a truck wheel nut to a rim clamp of a wheel and thereby preventing the wheel nut from turning relative to the rim clamp is disclosed. The retainer comprises a substantially flat annular member made of a resilient metal, the annular member having an inner rim defining an opening and a planar outer rim circumferentially surrounding the inner rim. The outer rim has opposite first and second sides and the opening is dimensioned and configured to receive and secure the wheel nut. The retainer also has a first arm extending substantially perpendicularly from the first side of the outer rim at a first portion of the outer rim, and a second arm extending substantially perpendicularly from the first side of the outer rim at a second portion of the outer rim, the second portion of the outer rim being positioned at an obtuse angel relative to the first portion of the outer rim.