My brother in-law works for one of Austrailia’s largest Car insurers. He works in a section that is officially there to investigate fraud, and bogus claims – however there is a large team (he is in it) within the fraud group that’s only existence is find ways to deny otherwise valid claims (Staff bonuses paid on number of claims denied), and I’m told that claims on 4WD vehicles are easy pickings for them, oversize tyres being the number reason they deny and force the client to court, where the client rarely wins. The information is also passed to the accident investigation people or coroner in the event of a fatality. Insurance companies are a vindictive little group… I don’t have any time for this family member but I’m not game to step out side the laws after hearing what his work days involve… My D2 has 245/70s...
If the diameter of the tyre is increased the brakes have to work harder and are less affective (simple leverage equation) this is why the law exists.
When I changed the wheel and tyre combo on my boat trailer from 175R13 to 185R14 the electric/hydraulic (disc) braking system could no longer lock the rear axle when turned up full - the controller had to be set significantly higher for normal braking.
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