[teaston]

Originally Posted by DaveH28

I wasn't sure which combination works out, I've heard that different make tyres can bother the xdrive... I know that's x-treme(no pun) but gotta think of these things..

I'm not a car modder normally, but this 335d I've picked up is ready for it and I'm not built into pcp..

No it’s just the rolling circumference that matters, because any difference in the amount of revolutions the front and rear do means the clutches in the transfer box wear excessively. Officially it’s 1% allowance, but you can bet that’s conservative. I’m actually running 245/35’s on the front which are 1.09% different to the rears and I’ve had no problems. Many others have also done similar.

[DaveH28]

Originally Posted by teaston

No it’s just the rolling circumference that matters, because any difference in the amount of revolutions the front and rear do means the clutches in the transfer box wear excessively. Officially it’s 1% allowance, but you can bet that’s conservative. I’m actually running 245/35’s on the front which are 1.09% different to the rears and I’ve had no problems. Many others have also done similar.

If I ended up going for 20's...

What tyre size works then?

Tia

[teaston]

Originally Posted by DaveH28

If I ended up going for 20's...

What tyre size works then?

Tia

What width wheels? And what offset?

[DaveH28]

Originally Posted by teaston

What width wheels? And what offset?

Ahh, yes sorry..
Was thinking 9j and 10j
Not sure what offset.....

Am I sounding like the complete clueless simpleton I am when comes to this haha..

It was if I went for the quantum 44 as in the original post..
Think they're et35 and et42

[teaston]

Originally Posted by DaveH28

Ahh, yes sorry..
Was thinking 9j and 10j
Not sure what offset.....

Am I sounding like the complete clueless simpleton I am when comes to this haha..

It was if I went for the quantum 44 as in the original post..
Think they're et35 and et42

Either 235/35 front and 275/30 rear or 245/35 front and 285/30 rear, both setups are only 0.07% difference front to rear, so effectively identical rolling circumference. I think 285’s will be very expensive though!

Those rear wheels could be a problem though, firstly they’ll be 14mm closer to the suspension strut so you’d want to make sure it doesn’t foul there, but also it will poke out 24mm more, so will protrude out beyond the wing quite noticeably. Someone put 20mm spacers on oem wheels before and it looked like a roller skate.

A 9.5j rear wheel with that offset would probably just be ok, poking 17.7mm more than oem, which would be very close to my 15mm spacers.

[DaveH28]

Originally Posted by teaston

Either 235/35 front and 275/30 rear or 245/35 front and 285/30 rear, both setups are only 0.07% difference front to rear, so effectively identical rolling circumference. I think 285's will be very expensive though!

Those rear wheels could be a problem though, firstly they'll be 14mm closer to the suspension strut so you'd want to make sure it doesn't foul there, but also it will poke out 24mm more, so will protrude out beyond the wing quite noticeably. Someone put 20mm spacers on oem wheels before and it looked like a roller skate.

A 9.5j rear wheel with that offset would probably just be ok, poking 17.7mm more than oem, which would be very close to my 15mm spacers.

I though 437m was a 10j though similar offset

[teaston]

Originally Posted by DaveH28

I though 437m was a 10j though similar offset

Yes but the 437M is designed for the M3/4 which has wider arches to accommodate them.

[R99]

437m are;

19x9 ET29
19x10 ET40

With the correct sizes (245/35 & 265/35 or 235/40 & 265/35) they sit under the arches.

Yes, the fitment is more aggressive than stock, but they do fit. Lowering is the best option to complete the “look” if you intend to go down this route.

[teaston]

Originally Posted by R99

437m are;

19x9 ET29
19x10 ET40

With the correct sizes (245/35 & 265/35 or 235/40 & 265/35) they sit under the arches.

Yes, the fitment is more aggressive than stock, but they do fit. Lowering is the best option to complete the “look” if you intend to go down this route.

The first setup is 2.1% different front to rear so definitely not recommended on xdrive. Second setup is a possibility as it’s only 0.37% difference.

Have you got any pics of them on an F30/31?

[R99]

Originally Posted by teaston

The first setup is 2.1% different front to rear so definitely not recommended on xdrive. Second setup is a possibility as it’s only 0.37% difference.

Have you got any pics of them on an F30/31?

Yes, I posted earlier that the 245/35 & 265/35 is for RWD and the 235/40 & 265/35 is for xDrive

I’ve got loads of pics on my build thread, I’ll add one to this thread later on

[DaveH28]

Originally Posted by teaston

Either 235/35 front and 275/30 rear or 245/35 front and 285/30 rear, both setups are only 0.07% difference front to rear, so effectively identical rolling circumference. I think 285's will be very expensive though!

Those rear wheels could be a problem though, firstly they'll be 14mm closer to the suspension strut so you'd want to make sure it doesn't foul there, but also it will poke out 24mm more, so will protrude out beyond the wing quite noticeably. Someone put 20mm spacers on oem wheels before and it looked like a roller skate.

A 9.5j rear wheel with that offset would probably just be ok, poking 17.7mm more than oem, which would be very close to my 15mm spacers.

How do you work out if the wheels will be or not,

They do the quantum 44 with front wheel of 8.5j, still et35.

This stuff baffles... I'm usually so Behind the door.

[teaston]

Originally Posted by DaveH28

How do you work out if the wheels will be or not,

They do the quantum 44 with front wheel of 8.5j, still et35.

This stuff baffles... I'm usually so Behind the door.

This is a useful site:

https://www.willtheyfit.com

[DaveH28]

Originally Posted by teaston

This is a useful site:

https://www.willtheyfit.com

How are you working out the percentage between gone rear though?

[teaston]

Originally Posted by DaveH28

How are you working out the percentage between gone rear though?

The speedo error percentage.

[DaveH28]

Originally Posted by teaston

The speedo error percentage.

Sorry that was a typo, it was meant to say front and rear..

So you work out the percentage error for each axle and is it the difference between the two?

[teaston]

Originally Posted by DaveH28

Sorry that was a typo, it was meant to say front and rear..

So you work out the percentage error for each axle and is it the difference between the two?

No, you put the front size on one side and the rear size on the other and then the speedo error will tell you the difference in rolling circumference between the two.

[DaveH28]

Originally Posted by teaston

No, you put the front size on one side and the rear size on the other and then the speedo error will tell you the difference in rolling circumference between the two.

Haha...

I get you bloody hell, sorry for the hard work.

Thanks for the help.

[DaveH28]

Originally Posted by R99

437m are;

19x9 ET29
19x10 ET40

With the correct sizes (245/35 & 265/35 or 235/40 & 265/35) they sit under the arches.

Yes, the fitment is more aggressive than stock, but they do fit. Lowering is the best option to complete the "look" if you intend to go down this route.

I've gone jumped in, think I've got a good deal on some 437s

Goin for the acs springs and then 235/40/19 and 265/35/19... so all should look great and work for the xdrive too..

Cheers happy new year

[R99]

Originally Posted by DaveH28

I've gone jumped in, think I've got a good deal on some 437s

Goin for the acs springs and then 235/40/19 and 265/35/19... so all should look great and work for the xdrive too..

Cheers happy new year

Congrats, they will look superb.

Silver or black?

[DaveH28]

Originally Posted by R99

Congrats, they will look superb.

Silver or black?

I went for the black (well with silver outside, black inner)

Your car looks great... mines estoril blue will be highlighted with gloss black m performance parts... so hoping will look pretty mean without being ott

[DThr33]

Originally Posted by teaston

Either 235/35 front and 275/30 rear or 245/35 front and 285/30 rear, both setups are only 0.07% difference front to rear, so effectively identical rolling circumference. I think 285’s will be very expensive though!

Those rear wheels could be a problem though, firstly they’ll be 14mm closer to the suspension strut so you’d want to make sure it doesn’t foul there, but also it will poke out 24mm more, so will protrude out beyond the wing quite noticeably. Someone put 20mm spacers on oem wheels before and it looked like a roller skate.

A 9.5j rear wheel with that offset would probably just be ok, poking 17.7mm more than oem, which would be very close to my 15mm spacers.

All depends on your suspension setup really. My rears are 20x10 et40 and with a 265/30s and a bit of camber they fit pretty well. The rim itself is basically in line with the arch, though I could always add a touch of negative camber if I wanted.
Got a few pics here:

View post on imgur.com

[teaston]

Originally Posted by DThr33

All depends on your suspension setup really. My rears are 20x10 et40 and with a 265/30s and a bit of camber they fit pretty well. The rim itself is basically in line with the arch, though I could always add a touch of negative camber if I wanted.
Got a few pics here:

View post on imgur.com

That is quite an extreme look, certainly not for everyone!

Also it looks like your grille slats are missing?