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[E.F.I]

TIRE TRIVIA

Did You Know:

•That a 23-degree tread bar angle offers the most traction? For years, tractor tire manufacturers used a 45-degree bar angle on rear ag tires. Yet it's been proven that you get more bite on the ground with more lugs from the 23-degree tire than from a 45-degree. A lot of people have the impression that a deeper bar should be better, but actually the 23-degree bar angle is the better design.

•That a tire with a lower, stiffer sidewall usually responds to your steering inputs faster than a tire with a taller or less rigid sidewall? The downsides to a tire with a lower or stiffer sidewall are a slightly harsher ride and rim vulnerability.

•That a stiffer sidewall helps in cornering? A softer sidewall is preferred for speed.

•That a radial is a type of tire constructed with rubber-coated, reinforcing steel cable belts that are assembled parallel and run from side to side, bead to bead at an angle of 90 degrees to the circumferential centerline of the tire (as opposed to the 30-degree alternating application lengthwise as in bias ply tires)? This makes the tire more flexible, which reduces rolling resistance. Numerous rubber-coated steel belts are then constructed into the "crown" of the tire under the tread to form a strong, stable two-stage unit. A key consideration for off-roaders is that the greater the sidewall strength, the more resistant the tire is to flex even when aired down to lower pressures.

•That "siping" a tire is a process named for a man named John Sipe? He received a patent in the 1920s after realizing that an array of small transverse cuts in the heels of his shoes gave him better traction. Later Goodyear received a US patent, claiming that the "sipes" improved traction characteristics in tires.

•That tread pattern refers to the overall structure of the tread? The tread patterns are made up of lugs and voids. The lugs are the sections of rubber that make contact with the terrain and voids are the spaces located between the lugs. A mud-terrain tire pattern is characterized by large lugs in the tread pattern with large voids between these lugs. The large lugs provide plenty of bite in poor traction conditions while the large voids allow the tire to clean itself by releasing and expelling the mud or other material while spinning. A hardpack general-purpose tire pattern is characterized by smaller voids and lugs compared to the mud terrain tire. A denser pattern of lugs and smaller voids make all-terrains quieter on hardpack than the mud terrain tire. The downside to an all-terrain is that the smaller voids cannot clean themselves as easily of mud, slush or material as can the larger voids on the mud tire. When voids fill up with mud, the tire loses much of its bite and traction.

•Self-cleaning is the effect of a tire's tread pattern to allow the release of mud or material from the voids of tread, thereby providing a good bite on every rotation of the tire? The better mud terrain tires will allow the mud or material to easily be released from the tread voids.

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