pprass posted:

Disco - thanks for the comments:

"Did this sound suddenly (this is the key word) appear while you were driving?" - Yes it did. One day it just became very noticeable.

"If so, suspect a tyre bubble or delamination between layers in the construction of the tyre" - I've looked all around the tyre and can't see any bubbles or defects.

"It is also possible that a large balancing weight or two have gone missing from the rim." - Maybe, but then I would expect the shudders at speed and it is a steady as a rock at > 110kmph.

"Did it start as soon as you started driving after the vehicle had been standing for a few days?" - No.

"If so, the tyres may have developed a temporary flat spot, nothing to worry about as it should disappear after a few km of travel." - It doesn't go away even after a trip of 200km.

"Scalloped tyres can be seen or can be felt by running the palm of the hand over the tread. This won't happen suddenly and is generally caused by wheel alignment, incorrect tyre pressures and/or stuffed shockers over a period of time." - I can see that the edges are scalloped. A tyre dealer told me once that the wheel alignment on Patrols rarely need adjustment. Maybe that is not correct.

Thanks for your input and to all others comments.

Peter