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WHEELS AND TIRES 10-2
either case, tires will revolve with a side motion and
scrape the tread rubber off. If misalignment is severe,
the rubber will be scraped off of both tires (or all four
tires if front toe is not correct); if slight, only one will
be affected.
The scraping action against the face of the tire causes
a small feather edge of rubber to appear on one .side of
the tread and this feather edge is certain indication of
misalignment (fig. 1). The remedy is. readjusting toe-in
within specifications, or rechecking the entire front end
alignment if necessary.
Heei and Toe
This is a saw-toothed effect where one end of each
tread block is worn more than the other.
The end that wears is the one that first grips the road
when the brakes are applied.
Heel and toe wear is less noticeable onsrear tires than
on front tires, because the propelling action of the rear
wheels creates a force which tends to wear the opposite
end of the tread blocks. The two forces, propelling and
braking, make for more even wear of the rear tires,
whereas only the braking forces act on the front wheels,
and the saw-tooth effect is more noticeable.
A' certain amount of heel and toe wear is normal.
Excessive wear is usually due to high speed driving and
excessive use of brakes. The best remedy, in addition
UNDERINFLATION WEAR
Fig. 1 - Toe In or Toe Out Misalignment Wear
Fig. 2 - Over and Under Inflation Wear
CHEVROLET CHASSIS SERVICE MANUAL
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