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If the brake drum and axle are spinning true the tyre may have been bruised and delaminated internally but that usually makes a lump not a flat spot. Flat spot normally comes from a big lockup.
Rock bruise would be pretty rare on 14 ply tyres unless run underinflated or grossly overloaded.
Check out the tyre pressures as overinflation will exacerbate bumps and lumps.
What brand and type of tyre??
They are Otani light truck 7.50 x 16.Quote:
Originally Posted by dromader driver
The flat spot isn't like what you'd get from a lockup, more like a slight dip (like what you'd get filing a round object like a tyre with a large round file) sort of like a slight imperfection. Seems to go when the tyres warm up.
Are those tyres old crossplies? If so, it is normal for them to develop a flat spot when the vehicle sits still on a cold night. As the tyre warms up, the flat spot goes away.
My Series III LWB with crossply retreads used to do that every morning, especially in the winter.
They are 2007 tyres, not old ones. And the issue is only with the one tyre. The car spends the night in a garage on carpet.
When I said "old", I meant "old fashioned". I meant the age of the technology. not the age of your particular tyre.
Being inside on carpet wouldn't make a lot of difference. The effect occurs because the synthetic fibres in the carcase deform because the tyre flattens on the bottom when it sits still and the fibres sort of set in that position in cold weather until they get warmed up a bit. The flat spot will also go away if the vehicle moves a bit so that the flat spot is no longer on the bottom, but it takes a little longer.
I guess Brisbane nights are not as cold as nights in Yass, so the problem might not be as noticeable on your vehicle as it was on mine. The fact that you spoil your vehicle by keeping it inside on carpet might also reduce the effect. :)
I think that the phenomenon occurs with all crossply tyres with synthetic fibres when they sit in one spot for a while, but most of the time the effect is so small and disappears so quickly that it is imperceptible.