Issue link: http://read.dmtmag.com/i/34501
BALANCE AND RUNOUT It is customary to check tire/wheel assembly balance if the driver makes a ride complaint. Before removing the tire/wheel assembly from the vehicle, check for radial and lateral runout. Bent wheels and rims, improper mounting, or flat spotting can cause excessive runout. If balance is still required, a simple static balance with bubble balancer or a wall mounted axle bearing and hub type gravity balancer should be sufficient. See Section Nine, Appendix for Runout and Vibration Diagnosis on Pages 134-135. Current Technology & Maintenance Council (TMC) limits from TMC RP 214C, Tire/Wheel End Balance and Runout, are listed in the tables below. TABLE A: RECOMMENDED BALANCE AND RUNOUT VALUES FOR DISC WHEELS AND DEMOUNTABLE RIMS Balance Tubeless Steel Disc Wheels Tubeless Aluminum Disc Wheels Tubeless Demountable Rims Steel Wide Base Wheels Aluminum See Note 1 0.030 inch max 0.030 inch max Note 1: Refer to the manufacturer’s specifications for balance and runout values. Note 2: Amount of weight applied to rim to balance individual wheel component. Note 3: For steel wheels, the area adjacent to the rim butt weld is not considered in runout measurements. TABLE B: TIRE/WHEEL ASSEMBLY BALANCE AND RUNOUT LIMITS 19.5 Tire Position Maximum total weight correction expressed in ounces of weight required to correct at rim diameter per rotating assembly for rotating assembly for rotating assembly Radial runout Lateral runout Steer Drive/Trailer Steer Drive/Trailer Steer Drive/Trailer Tire/Wheel 14 oz. 18 oz. 0.095" 0.125" 0.095" 0.125" Over The Road Applications 16 oz. 20 oz. 0.095" 0.125" 0.095" 0.125" On/Off-Road Applications 18 oz. 22 oz. 0.110" 0.125" 0.110" 0.125" Wide Base Tire/Wheel 24 oz. 28 oz. 0.125" 0.125" 0.125" 0.125" Note: If tire and wheel assembly is within these limits and ride problem still exists, refer to TMC RP 648, Troubleshooting Ride Complaints. (See Note 2) 6 oz. max 4 oz. max N/A See Note 1 Radial Runout (See Note 3) 0.070 inch max 0.030 inch max 0.070 inch max 0.075 inch max Lateral Runout (See Note 3) 0.070 inch max 0.030 inch max 0.070 inch max 0.075 inch max 42 Section Three: Extending Tire Life