Technician A says an automotive tire’s belts stretch horizontally across the beads to form the carcass, or body, of the tire. Technician B says an automotive tire’s liner provides a leakproof membrane for tubeless tires. Who is correct?

Technician A says a radial ply tire’s belts are sometimes made of steel. Technician B says a radial ply tire’s belts are sometimes made of fiberglass. Who is correct?

Technician A says tire markings on the sidewall of a tire give information about a tire’s load-carrying ability. Technician B says tire markings on the sidewall of a tire provide the tire’s speed rating. Who is correct?

A tire size measurement given in the P-metric size designation is listed as: P235/50 R18. Technician A says the number 50 is the aspect ratio, which measures the tire’s weight at 50% of the tire’s cross-sectional width. Technician B says the number 18 signifies the tire’s year of manufacture in the 21st century, which is 2018. Who is correct?

Tire grades and tire markings are being discussed. Technician A says tire tread wear, tire traction, and tire temperature resistance ratings are all part of the Uniform Tire Quality Grading System. Technician B says a tire’s load index is listed as a letter from B to Y on the tire sidewall that correlates to a weight-carrying capacity range of between 1,000–1,500lb (456–680 kg). Who is correct?

Technician A says vehicle manufacturers instruct owners to drive on a compact spare tire in the exact manner as they would drive on a traditional full-size automotive tire. Technician B says run-flat tires are constructed with wear bars that serve as a supplementary protective layer over the tire tread. Who is correct?

Tire pressure monitoring systems (TPMS) are being discussed. Technician A says a TPMS is installed only in commercially used vans and trucks in the United States. Technician B says some TPMS give the air pressure reading for each tire on the dash display. Who is correct?

Technician A says on passenger vehicles, the center wheel section of a drop-center wheel has a smaller diameter than the rim to ease tire installation and removal. Technician B says the majority of automotive wheels are made of aluminum. Who is correct?

Technician A says that depending on the vehicle manufacturer, lug nuts are manufactured with both right-hand threads (turn clockwise to tighten) or left-hand threads (turn counterclockwise to tighten). Technician B says lug bolts are press-fit into the hub or axle flange and can only be removed with manufacturer-specific tools. Who is correct?

Wheel weights are being discussed. Technician A says wheel weights are thin metal strips that are pressed into the grooves of a rubber tire tread to offset tread height manufacturing inconsistencies. Technician B says wheel manufacturers recommend using a hammer to apply clip-on lead weights to an aluminum wheel. Who is correct?

Technician A says wheel bearings in several vehicle models are the tapered roller bearing type. Technician B says wheel bearings in certain vehicle models are the ball bearing type. Who is correct?

The basic parts of an automotive wheel bearing are being discussed. Technician A says a wheel bearing’s outer race is sometimes pressed into the automobile’s steering knuckle. Technician B says the bearing’s outer race is sometimes pressed into the hub. Who is correct?

Technician A says a steering knuckle is a basic component in a driving hub and wheel bearing assembly. Technician B says the inner stub shaft is a basic component in a driving hub and wheel bearing assembly. Who is correct?

Technician A says an automotive tire’s beads are used to stiffen the tire treads. Technician B says an automotive tire’s beads are used to hold the tire’s sidewalls against the wheel rim. Who is correct?