OTR 16.5" x 5" Balanced Outboard Mount Brake Drum. This outboard-mounted, machine-balanced brake drum is engineered to address common heavy-duty fleet braking problems: uneven braking forces, vibration-induced wheel-end wear, and heat-related brake fade that shorten service intervals. The balanced design reduces dynamic imbalance at the wheel-end, lowering vibration transmission into hubs and suspension and helping maintain proper shoe-to-drum contact across service life. Precise pilot and bolt patterns simplify alignment at installation, which reduces time in the shop and repeat wheel-end adjustments. Built to the 16.5" x 5" brake size standard, this drum is offered with a hub pilot nominal diameter of 8.78" and a typical 10-bolt, 11.25" bolt circle configuration, and its nominal weight in the 92“97 lb range provides predictable inertia characteristics for braking system tuning. Those attributes contribute to measurable operational benefits: more consistent braking torque under repeated stops, reduced incidence of vibration-related component replacement, and improved heat management that mitigates brake fade during sustained or heavy use. For maintenance planning, the predictable fit and balance reduce rework and alignments at the wheel-end, which can lower labor hours per brake job and extend intervals between corrective maintenance. This brake drum is a direct aftermarket option designed to match common outboard mounting applications used across heavy-duty tractors and vocational trucks. Specify the 16.5" x 5" balanced outboard configuration when replacing outboard drums to restore wheel-end balance, control heat build-up during duty cycles, and re-establish consistent stopping performance across a fleet.