Changing 19” wheels to 18” M340i Touring

[Tony Tee]

I’ve got a 2022 340i Touring with 19” alloys and Pirelli run-flats. What’s the view on changing to 18” and non run flats? Thanks

[Speed 3]

I ditched the runflats on ours as I always do with BMW/Mini cars, I absolutely hate them. The ride is much better and the TC doesn't keep kicking in in winter as the sidewalls are more compliant. I always go for Michelin Pilot Sports (4S IIRC on this car) which are the best you can get. I don't know why you'd want to drop to 18's, the ride is fine on 19's non-runflats. I have a spinal injury which forced me to change my Boxster S for a base on smaller wheels but I've been to the Alps and back in the BMW and its really comfortable. I'm not even sure you'd get them over the brake calipers (base spec I believe is 19 with options for 20" on the M340). I also run 19" winters on this car and they're fine too.

Edited by Speed 3 on Friday 18th April 14:52

[Lincsls1]

Loose the run-flats, but the 18's will look to small IMO. I don't know if that would bother you though?

[Tony Tee]

Thanks for your replies. One of the reasons, I’ve been given is 18” & non run flats provide slightly more protection against potholes. ( I’m on my 3rd tyre in less than 18 months). I accept it’s not ideal though. Non runflats have more sidewall flexibility and cheaper. My tyre info plate states it’ll take 17/18 or 19 inch rims/tyres.

[Big Rat]

Not the same car as yours OP mines a 2019 Xdrive 540i touring needed all four 20” runflats changing due to age and cracking, the run flats were coming in at £1400-1500 all in but chose non runflats in Goodyear Eagle 6’s all in fitted just over £800.00

Oh and a couple of tins of water soluble slime in the boot just in case, my recovery covers me in the event of punctures anyway.

The handling is unaffected the ride is night and day better and way so much quieter.

[danb79]

FWIW on my F31 - I binned the 19s with RFTs the weekend I collected it and have run it on 18s with non RFTs since and would never change

Drives so much better; handles better, quieter/smoother and it takes the rough local rural roads superbly

Straight set of 18" 405Ms with Goodyear Assym 6s all round - they don't look small at all and decent sidewall too, which is always good

Edited by danb79 on Friday 18th April 21:46

[Pica-Pica]

On my F30 335d, hated my 19” Pirelli sizes. I went to 18” Goodyear EfficientGrip (staggered, still). I kept to runflats, because the roads are quite good around here. Next tyre change I may go to non-runflats, though. You won’t regret the drop in size. They look much better than 19” as well.

[Omaruk]

It’ll be a much better ride with 18 wheels and more predictable on the limit

[JW911]

Not a 3 but a 6 in my case. I went from 18” with RFT to 19” with non-RFT. The ride improved so I wouldn’t worry too much about the alloys. Just ditch the tyres.

[SteBrown91]

From a fitment point of view they will be fine - police spec m340is are fitted with the standard m sport 18s.

Might look too much like a 320d though

[Billy_Whizzzz]

18s on my G31 530d M sport after endless nightmares with 20s

[Big Rat]

Billy_Whizzzz said:

18s on my G31 530d M sport after endless nightmares with 20s

Sorry to hear your 20”s were a problem guessing damage potholes etc ……

Mine touchwood have been ok over 50k but have switched out the runflats as mentioned earlier….

We’ve toured most of UK and Europe with it and done many thousands tugging this thing around…