New Tyres - 340i Touring

[interstellar]

My 340i Touring is getting some new tyres soon as I have done 30k in it so far.

It has pzero run flats at the moment but I want to move away from run flats to avoid road noise etc.

If I fit normal tyres does anything need to be changed reference the tyre pressure monitors or anything else or is just change the wheels and drive the thing? I assume so?

Any other 340i drivers changed yet and if so what to and why?

Thanks in advance.

[Lowtimer]

Makes no difference which engine your F30 has. Just put the new tyres on and drive.

[MattOz]

Just change them and drive! Michelin PS4S would be the tyre of choice.

[interstellar]

Lowtimer said:

Makes no difference which engine your F30 has. Just put the new tyres on and drive.

I realise the engine makes no difference but wondered if other 340i drivers have changed tyres yet as the model is only about 18 months in and not many private owners would have done 30k plus.

[Roma101]

Doesn't really help you, but I recently went through this thought process on my 2 year old 340i (14k miles). I concluded that if I was going to keep the car, I would swap the current factory RFTs for PS4s. Not because they have worn out, but because everyone (well, most) says the car feels much nicer to drive on normal tyres. However, I am probably going to change cars at some point in the next 6 months, so I have decided not to waste my money.

[interstellar]

Any issues with changing the rears to non run flats but keeping the fronts on run flats (the fronts have plenty of life left in them)?

[Lowtimer]

I wouldn't do that.

[jon-]

interstellar said:

Any issues with changing the rears to non run flats but keeping the fronts on run flats (the fronts have plenty of life left in them)?

You're changing the roll stiffness of the rear of the car and not the front.

You can do it, but I wouldn't advise it.

[GTEYE]

interstellar said:

Any issues with changing the rears to non run flats but keeping the fronts on run flats (the fronts have plenty of life left in them)?

Its a huge no-no to do that

[Silverbullet767]

Bite the bullet and change all 4 for Michelin PS4S.

The car will be transformed.

[interstellar]

i have always rated uniroyals rainsport 3’s but they only do a 235 for my fronts not a 225.

I have asked on a different thread but thought the bmw guys would also have an opinion on this.

Apart from the clearence in the arch and the wheel liner any other reason not to do it?

[jon-]

interstellar said:

i have always rated uniroyals rainsport 3’s but they only do a 235 for my fronts not a 225.

I have asked on a different thread but thought the bmw guys would also have an opinion on this.

Apart from the clearence in the arch and the wheel liner any other reason not to do it?

You'd have to tell your insurance co as it's classed as a modification.

[Hunky Dory]

Silverbullet767 said:

Bite the bullet and change all 4 for Michelin PS4S.

The car will be transformed.

I have done this on mine and I was amazed at the improvement.

Much more communication through the steering (although it is still not exactly full of feeling),

I immediately noticed the reduced high frequency vibration that used to be constantly there with the stiff RFT's, now virtually disappeared as the PS4's seem to have just that little more compliance and therefore absorb small surface imperfections far better.

As for the difference when hitting medium sized bumps / holes / cats eyes, again a massive improvement.

These were the main improvements - mainly benefits in ride as opposed to handling IMO.

I have read many people eulogising over the amazing improvements in handling and cornering prowess and, whilst I would admit there are improvements in this area, they're secondary to the ride quality benefits IMO. Ultimately, there's no escaping it's an estate car and no tyres in the world will transform it into a sports car...!

I would wholeheartedly recommend it.