Where would you put the new tyre

[Ean Austral]

Gday All,


I have 5 tyres, 4 are 80% tread, 1 is 100%, prefer not to leave the spare at 100% so where would you put the one with 100%.


I normally rotate my tyres so this doesn't happen but these are rims and tyres I purchased 2nd hand. Am thinking either rear but just thought I would post the question to others.


Cheers Ean

[Tombie]

Too late mate.... Its not going to be part of this round... It will cause problems with the TR/DSC

[Ean Austral]

Too late mate.... Its not going to be part of this round... It will cause problems with the TR/DSC


Is it that sensitive ? wouldn't have thought it would make that much of an issue.


So what happens if you get a flat and have to put it on when they have worn another 20-30%




Cheers Ean

[bee utey]

The rolling diameter of a radial tyre is almost completely independent of the tread depth, it is a function of the length of the steel belt layer. If the system were that sensitive it would freak out every time you turned a corner. I wouldn't worry about it, back left is as good as any place.

[RHS58]

Could you buy a 6th tyre at 100% and rotate the 2 100% tyres in on the same axle.
So for instance have the 2 new ones on the front, and 2 @ 80% on the back and 2 @ 80% as spares.

It's basically what I'm doing with 6 tyres and rotating every 10000km.
And no problems with TR OR DSC.

[Drizzle]

5 wheel rotation normally introduces the new tyre at the back right:

http://www.bridgestone.com.au/tyres/passenger/care/rotation.aspx

[Tombie]

The rolling diameter of a radial tyre is almost completely independent of the tread depth, it is a function of the length of the steel belt layer. If the system were that sensitive it would freak out every time you turned a corner. I wouldn't worry about it, back left is as good as any place.


Corners don't upset the system because it uses steering angle input in its algorithms.

And yes, I've known them to get upset... Even slightly off and you can feel the vehicle "correcting" for it..

It's not a huge difference required to begin to make the machine start to compensate.

You could give it a go... In which case, RHR

[Redback]

Front is the best with AWD vehicles Ean, that's what I was told and what I've been doing as well, on the D2 and now the D4, but I guess rear should be fine also, according to Bridgestone.

The reasoning behind going to the front, had something to do with less drive from the front diff with the 60/40 split, I think you would only worry if the DSC was going off on a regular basis after fitting the newer tyre.

Baz.

[Ean Austral]

Ahh well just as I expected , back left, back right, front , and leave it as spare, or buy another tyre.


eani, meanie, miney , close my eyes and see where it goes.


Thanks all for the replies.


Cheers Ean

[Tombie]

Speak to Basil135

He recently asked for the spare to go into rotation and the service manager was adamant its was too late...

[Basil135]

You rang? :D


Had the car into Solitaire at around 20,000 km, and asked that they do a 5 wheel rotation, as we were heading to Sydney over Easter last year.

When I picked the car up, they had only done a 4 wheel rotation, as I was told that it was too late to include the spare in the rotation sequence, due to the wear on the other tyres.

Basically, as above, the rolling diameter would be out enough to upset the car. I did ask about the scenario if I had a flat, and was told that as soon as the tyre was repaired, it should go back on where it came from, and the spare goes back underneath.

[Tombie]

To give an idea of how sensitive the vehicle is and how fine the adjustments, "Basil" drove up to visit towing a trailer on Friday and could feel the vehicle adjusting for the minute movements of the trailer.

[Fatso]

Ahh well just as I expected , back left, back right, front , and leave it as spare, or buy another tyre.


eani, meanie, miney , close my eyes and see where it goes.


Thanks all for the replies.


Cheers Ean


Ya gotta love forums , but you can bet one of em will be right . Lol

[LRD414]

Hmmm, this is a potential flaw in my cunning plan for a second spare ...

The OD of my new D697 265/60 R18 is 775mm
The OD of my original 255/55 R19 is 763mm

I assumed that once the D697s had worn a bit, the 19" would work as a second spare if the first had already gone on the car somewhere remote. I thought this scenario similar to using the normal spare if it hadn't been in rotation.

So would it be drivable but a bit upset or would it spit the dummy and stop? Perhaps I should give it a go somewhere safe where it's easy to change the wheel back.

Also, I wonder how long can you leave it before rotating a normal spare into the mix? Really the handbook should cover this if it's an issue.

Cheers,
Scott

[Ean Austral]

I will measure the 4 used ones for tread depth and see if 1 or 2 are close and see if it can go on the same axle as the one that's close.


You would have to rotate all 5 tyres every 5000ks for the spare to be used correctly then. Gotta love the modern cars.
If its that sensitive, then I would rather get the new tyre involved sooner rather than waiting till they are 50% worn and then have to put a new tyre in the mix.


Don't particularly want to buy a 6th tyre .


Cheers Ean

[AnD3rew]

I had to unexpectedly and urgently throw on a brand new tyre when the other three were down to about 20%. I was worried about TR DSC etc etc and it was only goung to be a very short term solution. But the car doesn't even seem to notice it at all and it has now been on for about two months. Haven't tried it off road but it seems to handle suburbia and freeway just fine.

At 80% on the others I wouldn't worry at all. I would put it on the back as you might get more issues on the front with steering pulling etc.

[jonesy63]

The other variable not mentioned so far - is what type of tyre? 20% wear on a 15mm original tread depth (eg on MT) has a lot more difference than 20% wear on a HT tyre - starting at say 8mm.

[Geedublya]

In my experience at 80% you should be OK however it probably depends on the tyre. I was at about 60% when I put the new spare on the front left. I choose that position as it seems to wear the most.
I left it there while I rotated the other 4 through.
At the end the other 4 were at 5% and the new spare was at 15-20%. I didn't have any DSC issues and the car drove very nicely.

The tyres were the original Pirelli Scorpions.

[Redback]

I will measure the 4 used ones for tread depth and see if 1 or 2 are close and see if it can go on the same axle as the one that's close.


You would have to rotate all 5 tyres every 5000ks for the spare to be used correctly then. Gotta love the modern cars.
If its that sensitive, then I would rather get the new tyre involved sooner rather than waiting till they are 50% worn and then have to put a new tyre in the mix.


Don't particularly want to buy a 6th tyre .


Cheers Ean


We rotate every 5000ks with 5 and 6 tyres unless we are on a big trip(ie) more than 5000ks, then we rotate when we get back, I've put on tyres that were less worn the the ones already on the car, never had an issue, one just recently that had much more tread also, it was on the car for a few weeks without any problems, we had no choice, as we only had this tyre with more tread to replace the shagged tyre.

What I've noticed over the nearly 4yrs of owning the D4, is that the DSC reacts more to a deflated tyre, than one larger or smaller diameter tyre.

Baz.

[Graeme]

A 29" RRS wheel sounds a few alarms when mixed with D3/4 30" wheels.

[shanegtr]

I thought I was going to have problems today. Got a flat - my tyres that I run are 265/65/17, the spares are both 235/70/17. Didn't have any issues with faults getting thrown up or DSC playing silly buggers. It did go berserk when the tyre let go but:D

[Mungus]

At 12000kms I took the D4 in for an engine oil & filter change today and requested a 5 wheel rotation. Only did front to back as they said the wear was greater than 1.5mm difference to the unused spare and could not be done as it would cause the wheel speed sensor to throw a fault. I told them I will do it myself. I can't find anything on Topix or in the Owners Manual on this matter. LRA should state a recommended rotation at 5000kms if this is the outcome.

[Tombie]

At 12000kms I took the D4 in for an engine oil & filter change today and requested a 5 wheel rotation. Only did front to back as they said the wear was greater than 1.5mm difference to the unused spare and could not be done as it would cause the wheel speed sensor to throw a fault. I told them I will do it myself. I can't find anything on Topix or in the Owners Manual on this matter. LRA should state a recommended rotation at 5000kms if this is the outcome.

LR don't state what distance you need an alignment at either...

Both have too many variables....

I don't even bring my spare into rotation, I'm not a fan of reversing rotation on Tyres once fitted.

My spare moves onto the vehicle at under 3 years so will be fine for use.

[Mungus]

I don't quite understand Tombie. Not much of a variable if 1.5mm is too much out of whack from a dealers point of view. Wouldn't it be better to get the spare worn down, so all tyres are worn to a much closer percentage in case you need to use it far from home? Do you leave your spare for when you replace the others with new ones at around the 3 year mark, cause I thought your post #2 supported the too late and will cause issues reasoning?

[discotwinturbo]

I always use a 5 wheel rotation to the left.

I left the last change a bit late at 15k, and new tyre placed on back left and no issue at all with ABS sensors.

Brett...

[Tombie]

I will put the spare on with 3 new Tyres and the spare will become a brand new one.

Having seen wheels that are now running backwards to their original rotation fail at the belt
Overlap I only move front to rear.

I'm about to throw out 2 spare wheels that have never seen the road due to age on the D2 my son now drives.

Personal choice, and with the D4 your call.

Myself and another member have felt the minute adjustments the vehicle makes when being worked (trailer on verge of sway) and can tell you the system is very sensitive.

Also, for those who comment they can feel the vehicle float - this is it compensating for poor wheel alignment (front wheels) being fed by the steering angle sensor.

[Tombie]

As a rule, for me, my spare stays a spare - and will only touch the road in event of a primary failure.

[RHS58]

I have 2 spares and rotate 3 wheels along the left side and 3 along the right side.
Every 10000 km and no issues.

[discotwinturbo]

As a rule, for me, my spare stays a spare - and will only touch the road in event of a primary failure.

But if your tyres have worn down a fair way, then you need your spare, would the minute adjustments become bigger adjustments ?

Just checked my tyre depth from my swap last week, after towing the comp truck, the new one has 4 mill more depth then the other 3.

Brett...

[BobD]

I have two new D697's on the front one half worn on the back right and one well worn on the left rear (it was a spare when I destroyed a new tyre). I have also put a well worn spare on with near new tyres for the other three with no problems. I don't think it is as sensitive as the dealer is saying in real life. No DSC flashing or anything silly at all.

[jon3950]

Only did front to back as they said the wear was greater than 1.5mm difference to the unused spare and could not be done as it would cause the wheel speed sensor to throw a fault.

I guess the question is how much more, but 1.5mm? Really? That's a difference of around 0.2% on the rolling diameter. I find it very difficult to believe that would cause a problem. Tyre pressures and temperatures will make a bigger difference than that.

I think it's bad practice to put tyres with significantly different wear on the same axle purely from a performance point of view and if I destroy one tyre I will generally replace two, even if it's with the spare. Of course dealing with a flat tyre on the road is completely different.

Cheers,
Jon

[Epic pooh]

I did notice recently that mine let me know it had a tyre with a screw in it and a slow leak by some unexpected DSC activation. This behaviour was evident when one front tyre got to about 20psi - not sure what reduction in rolling diameter this is compared to the other tyres.

I too only do 4 tyre rotations on all my vehicles. This is not exactly classy as I've owned one of my cars for the past 23 years and it still has the factory supplied tyre as a spare (has been used once in that time) ... :eek: ... I probably should care about this but as this car pretty much only does town duties these days it's no big deal.