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Tires. Perform two basic functions:. Tires. Act as a soft Cushion between the road and the metal wheel. Provide adequate traction (friction) with the road surface. Parts. Tires. Beads two rings that are made of steel wire and encased in rubber.
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Perform two basic functions: Tires • Act as a soft Cushion between • the road and the metal wheel. • Provide adequate traction (friction) • with the road surface.
Parts Tires • Beads two rings that are made of steel wire and encased in rubber. • They hold tire side walls snugly against the rim. • Body Plies rubberized fabric and cords wrapped around beads. • Form carcass or body of the tire. • Tread outer surface of the tire that contacts the road.
Parts Tires • Sidewall outer part of the tire that extends from • the bead to the tread. Marking on the sidewall • provides the information about the tire. • Liner thin layer of rubber that is bonded to • the inside of the plies. It provides a leak proof • membrane for tubeless tires. • Belts used to strengthen the body plies and • and stiffen the tread. They lay between the • tread and plies.
Bias Ply Tires Tire Construction • The plies run at an angle from • bead to bead. • One of the oldest design. • Does not use any belts. • Allows body of the tire to flex easily. • Improved cushioning, hence smooth ride on rough roads. • Weakness of Bias-plies is that it reduces traction at high • speeds and increase rolling resistance.
Belted Bias Tire Tire Construction • Bias ply tires with belts added to • increase tread stiffness. • Belts and plies run at different angles. • Belts do not run around the sidewalls, • they lay under the tread area only. • Provides smooth ride and good traction. • Offers some reduction in rolling resistance over a bias ply tire.
Radial Ply Tire Tire Construction • Plies running straight across from • bead to bead, with stabilizer belts • directly beneath the tread. • Has a very flexible sidewall and a • stiff tread, giving it a very stable footprint. • Disadvantage is that it may produce a • harder, or harsher, ride at low speeds.
Speed Rating Tires M — 81 N — 87 P — 93 Q — 100 R — 106 S — 112 T — 118 H — 130 V — 149 W — 168 Y — 186
Expiry Date Tires • Tires have a shelf life of six years • They are known to explode (tread comes apart)
Feathering Tires problems • Improper alignment (TOE). • Worn or damaged steering or • suspension parts. • Hard cornering. Cupping • Worn or damaged steering or • suspension parts. • Improper balancing. One Edge • Improper alignment (CAMBER). • Worn or damaged steering or • suspension parts.
Tread Wear Markings Tires
Tires CREDITS Google Images