Thread: Mixing tyre types

No problem as long as the tyres are the same size.
The electronics can be sensitive to different size tyres as it'll show up a wheel speed fault so it may be worthwhile to physically check they're the same diameter. Some brands have different diameters even though they're the same stamped size.

The rule was it had to be the same tread pattern directly across the vehicle.
If you have to temporally fitt a spare I'm sure that would be ok.
As mentioned same size tyres will be ok.

Seeing a lot of cars come with a space saver these days , I see no problem running a different size or whatever as a second get out of jail spare.

While I have 255.70x16 on the car I intend to have a 205x16 as a second spare (spare on my camper trailer).

If push comes to shove you can reduce pressure in the other tyres and maybe blow the spare much higher to make the rolling diameter similar then drive slowly somewhere.

Lets face it, it should only ever be used in an emergency which would imply away from civilization.
Regards Philip A

Thanks all

I note the hankooks and wranglers have the same od so a good match



I guess if it came to it you would use a square tyre if it got you out of trouble 😊

Richard

Originally Posted by PhilipA

Seeing a lot of cars come with a space saver these days , I see no problem running a different size or whatever as a second get out of jail spare.

Regards Philip A

Space saver tyres are narrower than the standard tyre but the same rolling diameter of the standard tyre.

A constant 4WD vehicle, especially a D3, D4 or RRS will not like a smaller diameter tyre if driven anything more than a short distance. ( Within a few mm is ok but not say 12 - 20mm or more)
Wheel sensors will pick up the difference and bring up a DSC warning or fault.

Space saver tyres are narrower than the standard tyre but the same rolling
diameter of the standard tyre.

No way Jose', not the ones I have had. Mazda 121, Honda Jazz have both been considerably smaller, and all the ones I have seen mounted on cars have been smaller.

Regards Philip A

I those cars manuals do they say to put the space saver on the undriven wheels? ( Rear for those you mention)

I those cars manuals do they say to put the space saver on the undriven wheels? ( Rear for those you mention) 13th February 2014 05:53 PM

That is my experience also, but keep in mind you are only using a second spare to keep a wheel off the road. The instances where both a damaged tyre and the first spare are unable to be repaired with plugs are few and far between.

I would be willing to pull the ABS fuse so that the traction control would not object on my D2. BTW the early Range Rovers warn not to use tyres with a greater difference than 10% in diameter, and my D2 at least has a very similar mechanical drivetrain. In my instance a 205x16 is less than 5% different to a 255.70x16 and will be much less if the tyre were inflated to say 45PSI and the others reduced to say 20PSI.
IMHO car manuals only say those things to protect the car maker from litigation from people with absolutely no common sense.
Regards Philip A