Super Moderator & CA manager
SubscriberJust looking at the tyres on my rangie and the 101. Both need a tyre rotation as I haven't done this in some time. I also have a 6th tyre for the 101 that was purchased second hand and has more wear than the others. My question is how much difference in wear will the drive train deal with?
Any insight or experience welcome.
Cheers - Gav.
If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
AT REST
The rolling diameter is a function of the length of the steel belts and will vary little with tread depth unless massively over inflated. In the contact patch the tread is perpendicular to the road over a varying area depending on the pressure and load but within normal loading tread depth does not noticeably change the rolling diameter.
RoverLord
nominally 10% between the tallest and the shortest rolling diameter is the recommended limit.
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I find that very interesting actually cheers for that bee utey.Originally Posted by bee utey
The rolling diameter is a function of the length of the steel belts and will vary little with tread depth unless massively over inflated. In the contact patch the tread is perpendicular to the road over a varying area depending on the pressure and load but within normal loading tread depth does not noticeably change the rolling diameter.
However im curious of one thing. If you get a flat spot on your tyres it creates a noticeable difference when it rolls over. So there must be some tread depth relevance yes?
Super Moderator & CA manager
SubscriberSo, you wouldn't consider putting a tyre with 100% tread on a vehicle that is currently running a full set at about 75 to 80%?
If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
I have done it before on the rear of my car. Drove ok for the month or so i had an uneven set. I went one further and put a new road tyre on with 3 older ATs.
Like i said it worked just fine. Certainly dont recommend mixing tyres like i did though.
AT REST
Tyre sidewalls flex to allow the tread to flatten against the road, and the height of the axle above the road can still change with a change in tread height. If you had a super fast response speedo you'd be hard pressed to find a change in rotation speed though.
Next time you inflate a tyre, measure the circumference with a tape before and after you inflate it. You'll find that the steel belts don't change in length very much so the circumference doesn't noticeably change, and so long as the contact patch is of a reasonable size the tread contact patch is dead flat and very close to the length of the steel belts above it. I used to do the exact same country trip half a dozen times a year and to while away the hours I'd compare the odo reading to the roadside distance markers. Regardless of tread depth the odo error always remained exactly the same.
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