Automotive Business Review February 2015 | Page 53
LAUNCHES • REVIEWS • MOTORSPORT
Tyre safety dips in 2014 - Bridgestone
Tyre safety has declined in 2014.
This is the word from Bridgestone,
which was commenting on feedback
from its countrywide Tyre Check
programme, now in its seventh year.
“The Tyre Check surveys in 2014
covered five of the nine provinces in
South Africa and checked 6708 tyres
for condition, inflation pressure and
tyre mis-matching on the vehicle,”
says Bridgestone’s general manager
for Field Engineering and Technical
Services, Hiroshi Nakanishi.
“The 2014 surveys also included a new
system of categories which recorded
tyre pressure in more detail.”
Nakanishi says that the percentage
of tyres classified as ‘fine’ (correctly
inflated) dropped substantially compared
to 2013. In 2013, over 90 percent of
tyres were classified as ‘fine’, but this
declined to 82 percent in 2014.
The highest-scoring survey in 2014,
conducted at Springfield in KwaZuluNatal, returned an 89 percent ‘fine’
rating, but none of the other locations
scored higher than 85 percent, and the
survey done at Kolonnade Retail Park
returned just 76 percent, the lowest
score at any location since 2010.
The most common tyre issue found by
the Bridgestone Tyre Check team was
under-inflation.
At each survey, around five percent of
tyres were found to be in a severe state
of under-inflation; at the Kolonnade
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survey, almost 17 percent were
dangerously under-inflated.
Another feature of the 2014 surveys
was the number of tyres which were
found to be mis-matched, meaning that
tyres of different sizes, tread patterns or
from various tyre manufacturers were
found on the same vehicle.
“Mis-matched tyres will affect roadholding and braking characteristics,
especially when different tyres are
fitted to the same axle”, Nakanishi
explains.
“Most of the surveys showed a mismatch rate of three or four percent, but
the Kolonnade mis-matching rate was
12 percent, rising to 14 percent in the
Port Elizabeth survey” he adds.