The maximum allowable run out on cast spoke wheels is which value?

The maximum allowable run out on cast spoke wheels is which value?

• A. 1/8 inch
• B. 3/16 inch
• C. 1/4 inch
• D. 1/2 inch

Answer: (C)

Runout is the amount the wheel’s mounting surface deviates from a true circle as it spins. Cast spoke wheels are built with looser tolerances, so the acceptable deviation is larger. The maximum allowable runout for these wheels is 1/4 inch—this keeps the wheel, tire, and braking action from being adversely affected. If runout were any greater, you’d see vibrations, uneven tire wear, and potential brake pulsation, so the wheel would be out of spec and typically need replacement. Smaller tolerances like 1/8 inch or 3/16 inch are too tight for this wheel type, and 1/2 inch would be unsafe due to excessive wobble.

Runout is the amount the wheel’s mounting surface deviates from a true circle as it spins. Cast spoke wheels are built with looser tolerances, so the acceptable deviation is larger. The maximum allowable runout for these wheels is 1/4 inch—this keeps the wheel, tire, and braking action from being adversely affected. If runout were any greater, you’d see vibrations, uneven tire wear, and potential brake pulsation, so the wheel would be out of spec and typically need replacement. Smaller tolerances like 1/8 inch or 3/16 inch are too tight for this wheel type, and 1/2 inch would be unsafe due to excessive wobble.