tire safety tyre safety. most of us drive motor vehicles on daily basis but hardly pay attention to...
TRANSCRIPT
Most of us drive motor vehicles on daily basis but hardly pay attention to one of the most vital parts of the vehicles - the tyres
TIRE SAFETY
Tyre Safety
Tyres expire 5 years after the date of manufacture. A tyre's expiry date is stamped on one side of it
TIRE SAFETY
Expiry Date
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• A tyre's expiry date is indicated by a 4-digit number stamped on it
• The number indicates the week and the year it was manufactured
• The expiration date is 4 years after
TIRE SAFETY Tyre Safety
This number indicates that this tyre was manufactured on the 7th week of 2007, which is the same as February 2007. That would place the expiry date on February 2011
07 0707 07
7th week of the year “February”
Year of manufacture 2007
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• Expired tyres are likely to burst when used, and this might result in very serious, or even fatal, accident
• It is advisable to check our tyres and make sure they have not expired
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Another important point that we miss many times is proper tyre inflation. Some vulcanizers will calibrate your tyres at 28 PSI and if you are going to travel they will, sometimes, bring your pressure down to 24-26 PSI because they will “heat up on the highway and the pressure will come back up”. DO NOT ALLOW THIS
Tyre Pressure
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• On the side of the tyre, you will find the maximum allowable inflating pressure for that specific tyre
• Some tyres have a maximum pressure of 32 PSI, some are rated at 44PSI and some even at 50 PSI. Check your specific tyre to see what the maximum pressure is
• It is an acceptable practice to have your tyres a few pounds below maximum allowable pressure but not too much
TIRE SAFETY Tyre Safety
MAX PRESS ACCEPTABLE
32 PSI 28 PSI
44 PSI 35 PSI
50 PSI 44 PSI
Different tyres are designed for different pressures. You will find the maximum tyre inflation pressure as a small number next to the rim on the side of the tyre. Never exceed this pressure!
(44 psi) MAX PRESS
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Lower pressure increases tyre heat. Infrared photograph of tyres tested at high speed shows damaging heat increases as pressure drops
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• The load we carry in our vehicles put strains on the tyres
• Tyres have maximum load rating designed for them
• Exceeding the maximum load can cause failure and this may result in accident
TIRE SAFETY
Load Rating
Tyre Safety
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Attached table shows the load index and maximum load carrying capacity per tyre in pounds and kilograms
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The speed rating of a tyre is indicated by a letter next to the load index. Adjacent table shows the speed ratings in Km/h & Mph
TIRE SAFETY
Speed Rating
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Many of us have bought tyres in the past and we are asked the sizes we just read them from the old tyres and give to the persons at the tyre shops. But, what do those numbers mean?
TIRE SAFETY
Tyre Size
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P 265 / 60 R 18
Passenger car tire Tire width in Millimeters
Radial Tire
Aspect ratio Height to width of tire 60% of width in this
case 18 Inch Wheel
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Temperature Resistance
• A tyre's resistance to heat is indicated by a letter
• Temperature resistance are rated from highest to lowest resistance as A, B or C
Simbolo
Symbol Area
AHot area
Area Caliente
BNormal Area
Area Normal
CCold Area
Area Fria
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Traction
• Traction is a tyre’s ability to stop on wet pavement. A higher graded tyre should allow you to stop your vehicle on a wet road in a shorter distance than a tyre with lower grade
• Traction is graded from highest to lowest as ”AA”, “A”, “B” and “C”
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Treadwear
The treadwear number indicates the rate at which the tyre wears out. The higher the treadwear the longer it should take the tyre to wear out. Hence, a tyre graded at 400 should last twice as long as a tyre graded at 200
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Summary
TIRE SAFETY
Watch the following indicators in your tyres to ensure safety:
•Date of manufacture / expiry date
•Inflation pressure
•Load rating
•Size
•Speed rating
•Temperature resistance
•Traction
•Treadware
Tyre Safety