Correct tyres for 640D on R18s ?

[doublejay]

I can't quite pin down the correct tyres for this car. It currently has 245/45/R18 all round - but a lot of place are suggesting a 275 tyre for the rear. It's Premium / LE trim rather than M Sport, if that makes a difference.

[Monty Python]

Have you tried Black Circles? Put your reg in and it'll show the recommended tyre fitments.

[cslwannabe]

Our 640d SE had 245/45/18s all round.

[doublejay]

That's settled then !

Thanks both.!

[cslwannabe]

No problem! Switched ours from Dunlop run flats (which weren’t bad) to Michelin Super Sport (PS4 didn’t exist back then!).

It was also excellent in the snow with Vredestein Wintrac winter tyres.

[d_a_n1979]

doublejay said:

I can't quite pin down the correct tyres for this car. It currently has 245/45/R18 all round - but a lot of place are suggesting a 275 tyre for the rear. It's Premium / LE trim rather than M Sport, if that makes a difference.

Are your alloys the same size all round; or do you have a staggered set up?

For staggered; wider alloys at the rear etc, will be why the wider rears are being suggested

Also; check Camskill for tyre prices; you just need to get them fitted locally

[junglie]

My F11 had staggered 613M alloys (similar to the 640d) and 275 section rears.

The 245s fit perfectly well all round, and well within the tyre manufacture tolerance, so no need for a 275 unless you specifically want to.

[doublejay]

junglie said:

My F11 had staggered 613M alloys (similar to the 640d) and 275 section rears.

The 245s fit perfectly well all round, and well within the tyre manufacture tolerance, so no need for a 275 unless you specifically want to.

Good to know. I have 245s on the rear now, but I think i cheaped out (well, I know i did) and they've been triggering DSC lights at speed in gentle corners. I had begun to think they were undersized but now i think it's just a crummy tyre.

[d_a_n1979]

doublejay said:

junglie said:

My F11 had staggered 613M alloys (similar to the 640d) and 275 section rears.

The 245s fit perfectly well all round, and well within the tyre manufacture tolerance, so no need for a 275 unless you specifically want to.

Good to know. I have 245s on the rear now, but I think i cheaped out (well, I know i did) and they've been triggering DSC lights at speed in gentle corners. I had begun to think they were undersized but now i think it's just a crummy tyre.

Have you checked what alloys you have?

[doublejay]

d_a_n1979 said:

Have you checked what alloys you have?

I haven't.

I will do, but they are factory 18's for the LE model.

[doublejay]

d_a_n1979 said:

Are your alloys the same size all round; or do you have a staggered set up?

For staggered; wider alloys at the rear etc, will be why the wider rears are being suggested

Also; check Camskill for tyre prices; you just need to get them fitted locally

how much would i expect to pay for fitting only ? Would I have them delivered to the garage ?

[d_a_n1979]

doublejay said:

d_a_n1979 said:

Have you checked what alloys you have?

I haven't.

I will do, but they are factory 18's for the LE model.

Which specific alloys do you have?

http://www.bmwstylewheels.com/6

[d_a_n1979]

doublejay said:

d_a_n1979 said:

Are your alloys the same size all round; or do you have a staggered set up?

For staggered; wider alloys at the rear etc, will be why the wider rears are being suggested

Also; check Camskill for tyre prices; you just need to get them fitted locally

how much would i expect to pay for fitting only ? Would I have them delivered to the garage ?

That's down the garage; for £beertokens, it'll be somewhere between £10-£20 a wheel; for full old tyre off, new tyre on and full balancing

You can have them delivered to you or your garage; you just input the specific addresses on Camskill etc...

[doublejay]

d_a_n1979 said:

Which specific alloys do you have?

http://www.bmwstylewheels.com/6

most like this

http://www.bmwstylewheels.com/bmw/218

[d_a_n1979]

doublejay said:

d_a_n1979 said:

Which specific alloys do you have?

http://www.bmwstylewheels.com/6

most like this

http://www.bmwstylewheels.com/bmw/218

According to this alloy wheel site; your alloys should be staggered:

https://www.auto-treff.com/wcf/index.php?article/2...

So that's something you need to find out. If you remove the rear alloys; it'll tell you the fitments on the rear of the spokes; it'll give you the size, the offset (ET) etc

Personally I wouldn't be running 245s on a 9" wide alloy; they need to be 265s or 275s as per the OEM sizing. If you've got a straight set of 19x8.5 alloys all round; then the 245/40s will be perfect

[doublejay]

d_a_n1979 said:

According to this alloy wheel site; your alloys should be staggered:

https://www.auto-treff.com/wcf/index.php?article/2...

So that's something you need to find out. If you remove the rear alloys; it'll tell you the fitments on the rear of the spokes; it'll give you the size, the offset (ET) etc

Personally I wouldn't be running 245s on a 9" wide alloy; they need to be 265s or 275s as per the OEM sizing. If you've got a straight set of 19x8.5 alloys all round; then the 245/40s will be perfect

really appreciate this. I'll try to get the wheel checked, but it seem to explain the DSC triggering under load - which it didn't do on the tyre it has on originally. Sadly i dont remember what size they were.

[d_a_n1979]

No worries

It could be that the tyres are passed their best too and slipping, hence the DSC kicking in!

[ATM]

d_a_n1979 said:

No worries

It could be that the tyres are passed their best too and slipping, hence the DSC kicking in!

This

I have the same 245 front and back on my 550i. The DSC will flash occasionally if they slip a little. That's normal. Having the same size means you can swap them round from front to back. If the back ones are looking a bit more worn than the front then try a swapsie.

The big question is what tyres are they?

A mid range Kumho will destroy a premium Pirelli run flat.

And obviously as the tyre ages it will go off. A newer tyre is always better than an older one.