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DISCO3.CO.UK > Wheels & Tyres

Wheel rim wear

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noworries4x4

Member Since: 18 Jul 2020
Location: Newton Abbot, DEVON
Posts: 24

2016 Discovery 4 3.0 SDV6 Commercial Auto Siberian Silver

I have had a reply back from Pirelli's technical department....

They recon the wheel wears under the bead of high mileage vehicles and this allows the bead to roll over slightly and then wear the back edge of the wheel.

Anyway I have found a set of take offs from a Discovery 5 with brand new tyres for £800 on ebay, the tyres would cost that with fitting. My 16 Discovery 4 Commercial Mobile Workshop and Escort Vehicle
MY 07 Full Fatt Range Rover Vogue SE TDv8
1952 Series 1 80" 3ltr Straight 6 with Overdrive

2nd Mar 2024 10:43 am

HairyFool

Member Since: 04 Jan 2023
Location: North Essex
Posts: 654

2016 Discovery 4 3.0 SDV6 Landmark LE Auto Zanzibar

The tyre is obviously spinning on the rim but the question is why? It would be a good idea to mark the tyre where the valve is or a photo showing existing markings on the tyre in relation to the valve. Aircraft tyres had specific marks to align with the valve when fitted and part of our routine inspections was to make sure there was no creep of the tyre on the rim. One bit the fitter should check is that the line around the base of the sidewall is equidistant from the rim edge all the way round. If it isn't it indicates the tyre bead has not seated properly into the bead seat.

The bead is a tight fit on the rim when the tyre is fitted although unlikely to be enough in itself to prevent slip under torque loading and especially when liberally coated with tyre bead paste which is a wax and lubricant mixture. You can get tyre bead sealant to effectively stick the tyre on, not too freindly for removing later and those beads pictured are too far gone.

When inflated the tyre wall is pressed against the rim to increase the grip so if anything a low pressure should be more of a risk for slip. I don't think it makes much difference to the grip of the bead itself as the bead wires are too stiff. What could happen in theory is that as the pressure rises the tyre will try to expand increasing in diameter and putting tension on the bead wires. I say in theory because I have never known it to be an issue. A visitor from the dark side, my other vehicle is an is still an EV. Strictly speaking its SWMBO.

3rd Mar 2024 10:41 pm

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