Triumph MAYFLOWER 1951, Instruction Book

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34
GENERAL UPKEEP— Care of Tyres
comfortable ride, when carrying only two persons, to run with the rear tyre pressures
2lbs./sq. in. below those recommended, provided they are checked weekly or some
convenient time when purchasing fuel.
WHY TYRE RESULTS VARY
Speed. Car owners vary greatly in the speed at which they habitually drive. The rate of
tread wear at 50 m.p.h. is double that at 30 m.p.h.
Rapid Acceleration and Cornering.
During wheel slippage caused by rapid acceleration
or severe cornering, excessive tread wear takes place due to the abrasion of the tyre
against the road surface.
Braking.
Some owners "drive on the brakes." It is established that where this practice is
adopted, and especially if stops are frequent, the rate of tyre wear increases
considerably.
FRONT WHEEL ALIGNMENT
The alignment of the front wheels is most important in its effect on tyre wear and good
steering. Excessive toe-in will lead to severe tyre wear particularly on the " kerb side "
front tyre.
"Toe-in
" or " toe-out " is the amount by which the front wheels are inclined from parallel.
Correct Wheel Alignment
The wheels should " Toe-in"
⅛" .
To Check and Adjust Wheel Alignment
Jack up each front wheel in turn until just clear of "ground." Spin wheel to test for
run-out. Set wheel so that maximum run-out is at the top. Lower and remove the
jack.
This operation will tend to correct for errors which might otherwise occur due to
wheel run-out.
Set the steering in the "straight ahead" position and measure the distance between
the two front wheel rims at a height above the ground approximately equal to that of
the wheel hubs. Take this measurement both in front of and behind the hub centres.
The amount by which the front measurement is less than the rear is termed "toe-in."