Nov

Tyre faults …again

2010-11-01 13:27

It is amazing how many tyre faults we find during every Brake & Tyre Watch exercise. It has got to the point where if we want to do a quick check on the roadworthiness of a rig, we merely look at the tyres. If they are badly maintained, you can bet your bottom dollar there will be other faults on the rig. Here, Terence Bowren from the training department of our long standing partner, Bridgestone South Africa, provides expert comment on some of the faults found at Polokwane:

This shows the start of diagonal wear which could be caused by advanced wear conditions or brake skid, spot wear or shoulder wear. This can also be caused by misalignment, mismatched dual sizes, loose wheel bearings or incorrect inflation pressures. Interesting case this one. The tyres look smooth but knowing the tread design, this tyre only has two main grooves so when the tyre is new, one can see the sipes which are short lived with tread wear. These tyres are designed for trailer use only and are still within the legal remaining tread depth.
This is tread separation caused by faulty retread workmanship or a contaminated buffed surface, old cushion gum or tread rubber or improper cure conditions. This tyre is unsafe to use and should be replaced. Shoulder repairs done to protect the cuts from growing. I doubt there was any repair done on the inner liner in those areas.
The front left tyre is running under pressure for the load it was expected to carry with lower mm than the right front tyre. The back left tyre has mismatched mm and tread design. In this pic, it is clear there is a mismatch in tyre sizes on the rear axle. The outer tyre is a 12R22.5 with a Rib- Lug retread pattern. The inner tyre is a 315/80R22.5 tyre with a Rib type tread design.

Please will operators take note and avoid similar mistakes. Although some of the faults are not safety critical, they are all costing you, Mr Operator, MONEY.

You’re throwing your bucks down the drain!

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