Freelander 1 Vibration/drone

Nodge68 said:

Basically there gearing is different between front and back, to give the FWD feel in normal driving. So to minimise rotational differences at each end of the VCU, the rear tyres must be the same size or larger than the fronts. The difference between front and back must be smaller than 5mm, rear being the largest. This will compensate for normal tyre wear of a full set. As the fronts wear about 50 faster than the rear, the the fronts will always be smaller.
When the fronts need changing, the old rear tyres are moved to the front, with identical new tyres then being fitted to the rear.
It's a reasonable system, providing the same tyres are still available. Problems arise when tyre fitters just slap any old tyre with the same markings one the car, usually on the front. (All tyre types differ in actual size, even if the size stamped on them is the same.) This puts the IRD under strain, as the VCU slips, causing it to transfer drive across its plates. If this condition as allowed to continue, severe damage is done to the IRD and diff.
So it's extremely important to always have matching sets of tyres, be they winter or summer, and always the least worn pair go on the rear.

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Alibro said:

We had 18 deg C yesterday morning when I left the house at 7am.
IIRC anything above 7C and you have less grip than with summer tyres and wear them out prematurely.

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teddywood1 said:

and there is a storm coming on Monday weather will change after that

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