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Combination of Old & New Rear/Front Tyres

I wouldn't replace two tyres that had done only 8000 miles as if you replace all four tyres they are unlikely to wear evenly

The recommendation for safety to counter oversteer on a rear wheel drive car is to put the two new tyres on the rear and the two 8K tyres on the front. Other way around for a FWD car because the rears hardly wear compared to the fronts.
 
I should know this, but I get confused with the various models these days: is the GLE 4WD ?
If so, the diffs might not like a mix of worn and new tyres front and back and or left to right.
Correct 😁😁. Hence post 18 #
 
I wouldn't replace two tyres that had done only 8000 miles as if you replace all four tyres they are unlikely to wear evenly

The recommendation for safety to counter oversteer on a rear wheel drive car is to put the two new tyres on the rear and the two 8K tyres on the front. Other way around for a FWD car because the rears hardly wear compared to the fronts.
Not much use when different sizes front and back.
 
Reminded me of this I saw earlier…

 
I would change all four, but look for the best quality tyres you can find - in my experience they are often worth the additional cost.

Michelin are my preference on SUVs - I have noticed significantly better tyre wear rates compared to the MO Pirellis that were fitted previously.

Flog the other two on eBay as part worns, someone will want them - or keep them as spares (but sod’s law says you’ll never use them!)
 
I would change all four, but look for the best quality tyres you can find - in my experience they are often worth the additional cost.

Michelin are my preference on SUVs - I have noticed significantly better tyre wear rates compared to the MO Pirellis that were fitted previously.

Flog the other two on eBay as part worns, someone will want them - or keep them as spares (but sod’s law says you’ll never use them!)
MO Pirelli PZero wear very quickly, I can cover more than twice as many miles with AO Pirelli PZero on the same car!
 
I wonder what tyres the OP is running at the moment - with only 8k they must be the OEM fitment.

@vghiya, out of interest do you know what tyres you have currently?
 
Yes, it's expensive to change all four tyres at once. But what price do you put on your car's occupants and other road users near you?

Mixing old and new tyres on the same axle is not recommended because it creates an imbalance in grip and traction, potentially leading to unpredictable handling, compromised braking, and increased risk of losing control of the vehicle, especially in slippery conditions; essentially, one tyre will grip the road differently than the other, causing uneven wear and potentially dangerous driving situations.

It's illegal to put different brands or models of tyres on the same axle. So if you choose to just buy two new tyres you'll be limited to matching those that you already have fitted. These may not be the best value available.

Don't do it.
As others have said, whilst it is not advisable it is not illegal.
 
Reminded me of this I saw earlier…


Great grip in the dry though ;) :D
 
I wouldn't replace two tyres that had done only 8000 miles as if you replace all four tyres they are unlikely to wear evenly

The recommendation for safety to counter oversteer on a rear wheel drive car is to put the two new tyres on the rear and the two 8K tyres on the front. Other way around for a FWD car because the rears hardly wear compared to the fronts.
I believe that the recommended practice if only changing two tyres is to fit tyres with the deepest tread to the rear regardless of the vehicle being RWD or FWD as having more grip on the front may lead to oversteer and understeer is easier for most people to deal with.

 
Because they have next to no grip!...... especially below about 7c.
I have had Pirelli tyres fitted to two cars, one new, one used.

Even with the new car I had them replaced after a couple of weeks as the grip was appaling in the wet and not overly inspiring in the dry.
 
To be fair to Pirelli it even says on their website that Zero's are not suitable for use below 7c.
 
To be fair to Pirelli it even says on their website that Zero's are not suitable for use below 7c.

I didn't check their website, but I don't think that's what it says... more likely it will say that below 7⁰C, winter tyres are better (or recommen).

Which is not the same as saying that the summer tyres are unsuitable (or unsafe) when the ambient temperature is below 7⁰C.
 
Because they have next to no grip!...... especially below about 7c.
That’s often said and it is mostly true, but a lot of it is because people have heard or read it. Some PZero take a while to get into their operating window, however not all PZero are equal.

Far from it, there are significant variations depending upon generation, manufacturer homologation and application which mean that the operating window also varies quite considerably.

Generally speaking though, their operating window is high than some other brands.
 
I wonder what tyres the OP is running at the moment - with only 8k they must be the OEM fitment.

@vghiya, out of interest do you know what tyres you have currently?
I have Michelin: Here are the details:
Front: Michelin Pilot Sport 4 SUV 275/45 R21 at Blackcircles.com
Rear: Michelin Latitude Sport 3 315/40 R21 at Blackcircles.com
Since they are different sizes, I can't put the used ones in front as some have suggested.

Both tyres are MO1 (Designed for Mercedes).

Costco is selling https://www.costco.co.uk/Tyres-Auto...-R21-110-Y-PILOT-SPORT-4-SUV-XL/tire/p/984972

Its same as the front one, but it doens't mention MO1 status.

If I were to go ahead with replacing only problematic tyre, is it ok to have two same tyres, but one with MO1 status and other not?
 
I have Michelin: Here are the details:
Front: Michelin Pilot Sport 4 SUV 275/45 R21 at Blackcircles.com
Rear: Michelin Latitude Sport 3 315/40 R21 at Blackcircles.com
Since they are different sizes, I can't put the used ones in front as some have suggested.

Both tyres are MO1 (Designed for Mercedes).

Costco is selling https://www.costco.co.uk/Tyres-Auto...-R21-110-Y-PILOT-SPORT-4-SUV-XL/tire/p/984972

Its same as the front one, but it doens't mention MO1 status.

If I were to go ahead with replacing only problematic tyre, is it ok to have two same tyres, but one with MO1 status and other not?
Wow - that’s surprising. Maybe the MO1 compound is different?

By comparison, I run PS4 SUV tyres on mine (GL63 AMG), but non-MO (I don’t think they were available in this fitment when I bought them).

Mine are also 21” (295/40/21) and after 11k miles they were still on around 5/6mm from memory.
 

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