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Wheels and Tyres - A Big Decision

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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mr wilks
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Wheels and Tyres - A Big Decision

Post by mr wilks » Fri Mar 16, 2018 11:06 am

TeeMac wrote: Fri Mar 16, 2018 9:26 am
HillWalker wrote: Thu Mar 15, 2018 10:28 pm Going from 30 profile to 35 on the rears makes the speedo 2.8 mph slow at 90 mph as smartbear says that probably makes it spot on, and going to 235 fronts only takes the sidewall increase from 3.1 to 3.2 in so no problem with it fouling on anything.
We might be at cross purposes here - the suggestion was to increase the tyre profile, not the width. Going from 225 35 to 225 40 on the fronts increases the sidewall height by 11mm, which might introduce the risk of fouling, hence my question.
215 40 19 on 8j fronts or 235 35 19 on 8j fronts will both add comfort + protection. Increase accuracy on speedo & reduce arch gap
That said 225 35 19 isn't really the problem , it's the rear 30 profile that is
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Wheels and Tyres - A Big Decision

Post by HillWalker » Fri Mar 16, 2018 11:58 am

One or two people have had slight issues with the 225/40, going the 235/35 gives a slight profile increase to go along with the 255/35 rears.

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Wheels and Tyres - A Big Decision

Post by biggles » Sat Apr 07, 2018 6:29 am

I ditched the run flats and upped the profile a long time ago and it’s such a major difference to the whole driving experience and no more cracked wheels either :thumbsup: it also fills out the arch gap nicely and to me the wheel/tyre aspect looks more balanced as well, the speedo now over reads by only around 1-2 mph, I now have 225/40/19 and 255/35/19 on stock non m sport suspension, there is no rubbing on the rears but the front does rub a tiny amount at full lock sometimes and it’s just a small patch on the front section of the arch liner, which can be sorted easily with a heat gun :o and a little reshaping if it bothers you!
For possible punctures I keep in the boot a pump, a bm jack which properly fits the jack points under the car and was a fiver from a scrap yard :thumbsup: a pack of rats tails and a tin of tyre stuff (probably would never use it because of the mess to clean out later)
Also if you think about it it’s rare to get a complete flat tyre it’s usually a slow puncture, but I have fixed a few and it only takes about 20 - 30 mins from start to finish, pumping it up is the longest bit! Or if you have break down cover get them to recover you and fix it later.
Now 2009 E89 3.0 Auto, Sapphire Black, Red Leather
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Wheels and Tyres - A Big Decision

Post by mcbutler » Sat Apr 07, 2018 2:44 pm

R60BBA wrote: Thu Mar 15, 2018 12:03 pm It would be probably more cost effective to replace your buckled alloy and get a set of PS4S tyres to replace your runflats instead of forking out for a set of 18s + tyres.

As Mr Wilks denoted, up the tyre profile, drive carefully and you’ll be fine :thumbsup:

How did you wrap your tyres in a playstation ?? :rofl:

I have 18s wrapped in PS4 and have found the sidewall quite forgiving :driving:
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Wheels and Tyres - A Big Decision

Post by R60BBA » Sat Apr 07, 2018 3:21 pm

mcbutler wrote: Sat Apr 07, 2018 2:44 pm
R60BBA wrote: Thu Mar 15, 2018 12:03 pm It would be probably more cost effective to replace your buckled alloy and get a set of PS4S tyres to replace your runflats instead of forking out for a set of 18s + tyres.

As Mr Wilks denoted, up the tyre profile, drive carefully and you’ll be fine :thumbsup:

How did you wrap your tyres in a playstation ?? :rofl:

I have 18s wrapped in PS4 and have found the sidewall quite forgiving :driving:
That’s sooooooo funny

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Wheels and Tyres - A Big Decision

Post by mcbutler » Sat Apr 07, 2018 3:28 pm

R60BBA wrote: Sat Apr 07, 2018 3:21 pm
mcbutler wrote: Sat Apr 07, 2018 2:44 pm
R60BBA wrote: Thu Mar 15, 2018 12:03 pm It would be probably more cost effective to replace your buckled alloy and get a set of PS4S tyres to replace your runflats instead of forking out for a set of 18s + tyres.

As Mr Wilks denoted, up the tyre profile, drive carefully and you’ll be fine :thumbsup:

How did you wrap your tyres in a playstation ?? :rofl:

I have 18s wrapped in PS4 and have found the sidewall quite forgiving :driving:
That’s sooooooo funny

:roll:
R60BBA wrote: Sat Apr 07, 2018 3:21 pm
mcbutler wrote: Sat Apr 07, 2018 2:44 pm
R60BBA wrote: Thu Mar 15, 2018 12:03 pm It would be probably more cost effective to replace your buckled alloy and get a set of PS4S tyres to replace your runflats instead of forking out for a set of 18s + tyres.

As Mr Wilks denoted, up the tyre profile, drive carefully and you’ll be fine :thumbsup:

How did you wrap your tyres in a playstation ?? :rofl:

I have 18s wrapped in PS4 and have found the sidewall quite forgiving :driving:
That’s sooooooo funny

:roll:
Your right, I will get my coat :telloff: :exitright:
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Wheels and Tyres - A Big Decision

Post by warmasice » Sun Jul 01, 2018 1:42 am

HillWalker wrote: Fri Mar 16, 2018 11:58 am One or two people have had slight issues with the 225/40, going the 235/35 gives a slight profile increase to go along with the 255/35 rears.
Did you go for 235/35? Are you on msport suspension?
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Wheels and Tyres - A Big Decision

Post by Zed Baron » Mon Jul 02, 2018 2:04 pm

step_change wrote: Thu Mar 15, 2018 4:15 pm I have considered doing likewise. However, the issue for me is if you get a flat tyre - even if you have a space saver spare - where do you put the wheel with the flat? It won't fit in the boot from what I have heard.
it will fit in the boot... so long as you have nothing else in there
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Wheels and Tyres - A Big Decision

Post by Rathean » Tue Jul 31, 2018 2:39 pm

Like the OP I've tried to stick with the runflats but 3 split alloys, 1 leaking damper and two new rear springs later I've got the message :headbang:

Replacing them with 4 of these bad boys clad in Michelin Pilot Sport

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Will post a piccy or two next week after they're fitted :driving:
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Wheels and Tyres - A Big Decision

Post by Rathean » Thu Aug 09, 2018 2:41 pm

Alpina alloys fitted with Michelin PS rubber. A quick 30 mile test drive to my favourite coffee shop and the ride is soooo much better than with runflats. It is like driving a different car, no more crashing over modest rough road surface but instead a more cushioned bump. The handling is still like rowing a canoe but I'm going to throw some after market dampers at it when pennies allow.

Anyone else considering sticking with runflats… don't, the damage over time on alloys and suspension is not worth it :poke:

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Wheels and Tyres - A Big Decision

Post by warmasice » Sat Aug 25, 2018 12:44 am

Rathean wrote: Thu Aug 09, 2018 2:41 pm Alpina alloys fitted with Michelin PS rubber. A quick 30 mile test drive to my favourite coffee shop and the ride is soooo much better than with runflats. It is like driving a different car, no more crashing over modest rough road surface but instead a more cushioned bump. The handling is still like rowing a canoe but I'm going to throw some after market dampers at it when pennies allow.

Anyone else considering sticking with runflats… don't, the damage over time on alloys and suspension is not worth it :poke:

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What size are you wheels and what size tyres did you opt for?
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