Spare tire rotation??

[Wazza D]

That has been the "classic" tyre rotation chart for very many years, and it works if you wish to to include your spare.
I I think the original chart came out with an attachment regarding termite treatment for the spokes.
When radial ply tyres first come out there was a recommendation not to include the spare but to move the tyres directly back and forth, no crossing over.
Anyhow, I really think it's up to the owner how he wants to do it.
As already pointed out, the space saver tyres indicate that it's not a big issue, and to confirm that further, my MB has different size wheels front and back plus a space saver. It would look bloody silly if you rotated them!
The most important thing to consider when rotating tyres on a 4x4 without a central diff, is to ensure that you don't create too much drive line wind up. This would be of more concern than the diffs compensating for a diameter discrepancy.
I don't include the spare on my JK but that is my decision, not my recommendation.
Also, I rotate mine on inspection or whether or not I am endeavoring to go on a long trip etc, not on kilometers.

[SeaComms]

Another tip. If you have directional tyres and do have a matching spare, you rotate the spare in on the passenger side as the most wearing tyre is usually front passenger. So drivers side just go front to back to front again, passenger side goes front to spare to back to front again.

Sent via Tapatalk from a small keyboard on my phone with fat thumbs and no glasses...

[PureCaboose]

Originally Posted by Kiwi Jeeper

Are you sure it has to be the same? How do you technically explain space saver donut spares? They are legally on many cars from the factory.

The space saver tyre is the same rolling diameter as the stock tyres, it is a different profile and width though. this leads to different amounts of grip and therefore traction which is why the space savers are limited to 80 km/h.

They can plan havoc with torque management differentials, such as a torsion or the likes if driven enthusiastically.

[PureCaboose]

Originally Posted by Wazza D

That has been the "classic" tyre rotation chart for very many years, and it works if you wish to to include your spare.
I I think the original chart came out with an attachment regarding termite treatment for the spokes.
When radial ply tyres first come out there was a recommendation not to include the spare but to move the tyres directly back and forth, no crossing over.
Anyhow, I really think it's up to the owner how he wants to do it.
As already pointed out, the space saver tyres indicate that it's not a big issue, and to confirm that further, my MB has different size wheels front and back plus a space saver. It would look bloody silly if you rotated them!
The most important thing to consider when rotating tyres on a 4x4 without a central diff, is to ensure that you don't create too much drive line wind up. This would be of more concern than the diffs compensating for a diameter discrepancy.
I don't include the spare on my JK but that is my decision, not my recommendation.
Also, I rotate mine on inspection or whether or not I am endeavoring to go on a long trip etc, not on kilometers.

Tyre rotation is a personal thing, I do a 5 tyre rotation on my Jeeps. When I had my Subaru I did a 4 tyre f-->r rotation due to directional tyres.

An acquaintance of mine had a Toyota MR2 and a Toyota Turbo Supra and they had different size tyres front to rear, so no tyre rotation could be done at all as they were directional as well. Used to annoy the tyre fitters as they tyre could only go on one way of you got it wrong you had to remount it

Each to their own. Do what works for you.

I know, when my 285/75R17 muddies were on the wear bars and I did a side by side comparison with the new ones there was over 20mm of different in height. This difference is enough to damage a differential, especially a clutched LSD over a long distance.

I don't know the impact on an ESP/traction control equipped vehicle but I can imagine it would trigger early as it would 'see' the wheels spinning at different speeds and react according to programming.

[Wazza D]

Originally Posted by PureCaboose

Tyre rotation is a personal thing, I do a 5 tyre rotation on my Jeeps. When I had my Subaru I did a 4 tyre f-->r rotation due to directional tyres.

An acquaintance of mine had a Toyota MR2 and a Toyota Turbo Supra and they had different size tyres front to rear, so no tyre rotation could be done at all as they were directional as well. Used to annoy the tyre fitters as they tyre could only go on one way of you got it wrong you had to remount it

Each to their own. Do what works for you.

I know, when my 285/75R17 muddies were on the wear bars and I did a side by side comparison with the new ones there was over 20mm of different in height. This difference is enough to damage a differential, especially a clutched LSD over a long distance.

I don't know the impact on an ESP/traction control equipped vehicle but I can imagine it would trigger early as it would 'see' the wheels spinning at different speeds and react according to programming.

What you are indicating is a rolling difference of more than 5" per revolution!
I am pretty sure that it would damage an LSD and surely effect your ESP etc.
To put that into perspective, that is about the same as fitting the OEM tyre back onto your Jeep running 285/70 R17s.

[Wazza D]

Oops. Having a low caffeine moment.
Not 5", about half that. Still too much though.

[PureCaboose]

Originally Posted by Wazza D

What you are indicating is a rolling difference of more than 5" per revolution!
I am pretty sure that it would damage an LSD and surely effect your ESP etc.
To put that into perspective, that is about the same as fitting the OEM tyre back onto your Jeep running 285/70 R17s.

I agree, and this is why I do a 5 tyre rotation on my Jeeps. Especially with the muddies. This way I know I can put on the spare and not damage the diff's or freak out the ESP/BAS/Nanny Computer thingy.