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Winter Wheels

Discussing the current generation Z4
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sars
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Winter Wheels

Post by sars » Sat Jun 19, 2021 10:15 pm

Last November I purchased a set of winter wheels for the SL, which I will be selling later this year, I’d like to get a set of winter wheels for my G29 on order, as the SL was much better in cold conditions. I am however, finding it difficult to find a set of wheels that fit with front 225/40 R19 on 8 x 19 ET20 and 245/40 R19 on 9 x 19 ET28 unless I go with the full size equivalents.

Just wondering if anyone else has gone through this process?
Gorgeous SFR Z4 M40i 8)
Gone 2017 Iridium SL400, 2015 435d xDrive Convertible, 2012 E350 CDi Convertible, 2010 DSB Z4 sdrive30i, 2008 Audi A4 Cabriolet, 2006 Phoenix Yellow Z4 2.5Si, 2003 Saab 9-3 Convertible

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raven
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Winter Wheels

Post by raven » Sun Jun 20, 2021 8:08 am

I think they need to be 35 high for 19inch tires.

The dealership offers a set of 18" rims/wheels here:
18” Dubbelspaak 798M, Orbitgrey
front: 255/40R18 99V XL
rear: 255/40R18 99V XL
Continental Winter Contact TS830P*

I ended up buying bigger wheels for the summer and ordered wintertires for my summer wheels, because the 18inch wheels lowerd my car so much i couldnt exit the garage anymore without scraping the bottom of the car :)

255/35r19
275/35r19

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2019 BMW Z4 G29 M40i @600hp - IG: ZZZZ_M40i

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ronk
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Winter Wheels

Post by ronk » Sun Jun 20, 2021 11:15 am

sars wrote: Sat Jun 19, 2021 10:15 pm Last November I purchased a set of winter wheels for the SL, which I will be selling later this year, I’d like to get a set of winter wheels for my G29 on order, as the SL was much better in cold conditions. I am however, finding it difficult to find a set of wheels that fit with front 225/40 R19 on 8 x 19 ET20 and 245/40 R19 on 9 x 19 ET28 unless I go with the full size equivalents.

Just wondering if anyone else has gone through this process?

When I bought my 35is I negotiated a good discount from the BMW Winter wheels package - I got them for Mrs K‘s 335 - it’s a square set up as they recommend and comes all ready to fit and only tpms to re calibrate.
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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sars
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Winter Wheels

Post by sars » Sun Jun 20, 2021 11:24 am

Thanks Raven, that's interesting that they offered 18" wheels as I was concerned that they may not fit over the M40i brakes and that they offered a square set up on 255's. I already have a full set of Conti allseasons in 255/35 R19 from the SL so could just get a new set of 9 x 19 ET32 alloys and sensors :thumbsup:

If I was sticking with 255 fronts on 19" then the 35 profile would be correct, however changing to 225/R19 they would need to be 40's to keep a similar rolling diameter.
Gorgeous SFR Z4 M40i 8)
Gone 2017 Iridium SL400, 2015 435d xDrive Convertible, 2012 E350 CDi Convertible, 2010 DSB Z4 sdrive30i, 2008 Audi A4 Cabriolet, 2006 Phoenix Yellow Z4 2.5Si, 2003 Saab 9-3 Convertible

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sars
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Winter Wheels

Post by sars » Sun Jun 20, 2021 11:25 am

ronk wrote: Sun Jun 20, 2021 11:15 am
sars wrote: Sat Jun 19, 2021 10:15 pm Last November I purchased a set of winter wheels for the SL, which I will be selling later this year, I’d like to get a set of winter wheels for my G29 on order, as the SL was much better in cold conditions. I am however, finding it difficult to find a set of wheels that fit with front 225/40 R19 on 8 x 19 ET20 and 245/40 R19 on 9 x 19 ET28 unless I go with the full size equivalents.

Just wondering if anyone else has gone through this process?

When I bought my 35is I negotiated a good discount from the BMW Winter wheels package - I got them for Mrs K‘s 335 - it’s a square set up as they recommend and comes all ready to fit and only tpms to re calibrate.
Not a bad idea, thanks Ronk :thumbsup:
Gorgeous SFR Z4 M40i 8)
Gone 2017 Iridium SL400, 2015 435d xDrive Convertible, 2012 E350 CDi Convertible, 2010 DSB Z4 sdrive30i, 2008 Audi A4 Cabriolet, 2006 Phoenix Yellow Z4 2.5Si, 2003 Saab 9-3 Convertible

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Winter Wheels

Post by ronk » Sun Jun 20, 2021 11:41 am

sars wrote: Sun Jun 20, 2021 11:25 am
ronk wrote: Sun Jun 20, 2021 11:15 am
sars wrote: Sat Jun 19, 2021 10:15 pm Last November I purchased a set of winter wheels for the SL, which I will be selling later this year, I’d like to get a set of winter wheels for my G29 on order, as the SL was much better in cold conditions. I am however, finding it difficult to find a set of wheels that fit with front 225/40 R19 on 8 x 19 ET20 and 245/40 R19 on 9 x 19 ET28 unless I go with the full size equivalents.

Just wondering if anyone else has gone through this process?

When I bought my 35is I negotiated a good discount from the BMW Winter wheels package - I got them for Mrs K‘s 335 - it’s a square set up as they recommend and comes all ready to fit and only tpms to re calibrate.
Not a bad idea, thanks Ronk :thumbsup:
The 335 uses 18“ (winter) wheels with a higher profile v the Std 19“ Low Profile set up - however they are perfectly adequate thro the cold and damp winter months. :thumbsup:
My local garage charged me £15 to swap the four wheels over.
I have been tempted to buy one of those wheel storage tree gismos for the garage.
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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Winter Wheels

Post by raven » Sun Jun 20, 2021 1:41 pm

They even sell a set of 17inch wheels, not sure if that is meant for the m sport brakes.

I found the 255s driving terribly in the wet compared to the 275 summer tires, so not sure if I would go with a 245 setup in the rear.
They may be better in the snow but for the 10days it snows here in Belgium I think I prefer a wider tire setup and have more grip the other 100 something days I drive with the winter tires. :)
2019 BMW Z4 G29 M40i @600hp - IG: ZZZZ_M40i

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sars
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Winter Wheels

Post by sars » Sun Jun 20, 2021 3:33 pm

raven wrote: Sun Jun 20, 2021 1:41 pm They even sell a set of 17inch wheels, not sure if that is meant for the m sport brakes.

I found the 255s driving terribly in the wet compared to the 275 summer tires, so not sure if I would go with a 245 setup in the rear.
They may be better in the snow but for the 10days it snows here in Belgium I think I prefer a wider tire setup and have more grip the other 100 something days I drive with the winter tires. :)
What make of winters were you running on the 255's to be horrid in the wet? I was mightily impressed with Conti all season contacts on the SL which has the same maximum torque as the M40i @ 500 Nm
Gorgeous SFR Z4 M40i 8)
Gone 2017 Iridium SL400, 2015 435d xDrive Convertible, 2012 E350 CDi Convertible, 2010 DSB Z4 sdrive30i, 2008 Audi A4 Cabriolet, 2006 Phoenix Yellow Z4 2.5Si, 2003 Saab 9-3 Convertible

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Winter Wheels

Post by ronk » Sun Jun 20, 2021 4:00 pm

The 235 (from Memory)!Pirelli Sotozerro tyres seem to cope ok with the 630Nm on the 335 - yes it’s got x drive but I never lacked confidence. Indeed as we were mainly in lockdown last year, the Winter Wheels remained on the car. It probably only covered 2k - it was a little softer around corners in the dry but acceptable.
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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Winter Wheels

Post by raven » Sun Jun 20, 2021 5:35 pm

sars wrote: Sun Jun 20, 2021 3:33 pm What make of winters were you running on the 255's to be horrid in the wet? I was mightily impressed with Conti all season contacts on the SL which has the same maximum torque as the M40i @ 500 Nm
Continental Winter Contact TS830P

maybe its just the difference with the 275 michelin ps4s'es i had before.
But they lost traction a whole lot easier when it was raining.

Getting michelin tires for the new winterset now, but i think it's mostly the width difference, and hopefully it will still be drivable on the snow with the wide tires, otherwise it will be 10days of vacation each year when its snowing :)
2019 BMW Z4 G29 M40i @600hp - IG: ZZZZ_M40i

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Winter Wheels

Post by sars » Sun Jun 20, 2021 7:44 pm

Have you thought of getting a set of all season tyres for winter instead of full winters. Here in East Yorkshire snow is infrequent, but frosty mornings are not and February can see double digit temperatures or April can see frosts. All season tyres are vastly superior in wet conditions and have a wide operating temperature range than winters.

A good source of tyre information can be found here, https://www.youtube.com/user/TyreReviews
Gorgeous SFR Z4 M40i 8)
Gone 2017 Iridium SL400, 2015 435d xDrive Convertible, 2012 E350 CDi Convertible, 2010 DSB Z4 sdrive30i, 2008 Audi A4 Cabriolet, 2006 Phoenix Yellow Z4 2.5Si, 2003 Saab 9-3 Convertible

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Winter Wheels

Post by raven » Sun Jun 20, 2021 7:58 pm

I could also keep the summer-tires all year long then if they perform better than the winter set, we'll see next winter how it goes :)
2019 BMW Z4 G29 M40i @600hp - IG: ZZZZ_M40i

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Winter Wheels

Post by ori » Sun Jun 20, 2021 10:26 pm

Never bothered with winter tyres here in the U.K. if it snows they make a big difference though.

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Winter Wheels

Post by ronk » Mon Jun 21, 2021 12:24 am

They begin to influence grip under 7°C :thumbsup:
I never bothered years ago but after experiencing them, they are a must have!
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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Winter Wheels

Post by ori » Mon Jun 21, 2021 4:07 pm

ronk wrote: Mon Jun 21, 2021 12:24 am They begin to influence grip under 7°C :thumbsup:
I never bothered years ago but after experiencing them, they are a must have!
I’m in London. We have a few weeks of temperatures under 7 degrees and really not worth spending thousands for those few weeks.

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