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post #1 of 11 (permalink) Old Jun 20th, 2014, 01:45 PM Thread Starter
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Mini Cooper S - Flat runs to normal?

Hi, this is probably a really stupid question, but is it possible to change the run flat tyres on my 07 plate Mini Cooper S to normal tyres of the same size? There's probably already a tonne of threads for this on here but I'm new to this and obviously too stupid to work it, so if anyone could point me in the right direction that would be great, thanks! Emma

P.s. I realise I put flat runs instead of run flats in the title :|
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post #2 of 11 (permalink) Old Jun 20th, 2014, 01:57 PM
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post #3 of 11 (permalink) Old Jun 20th, 2014, 02:33 PM Thread Starter
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Surely your very helpful comment applies to all threads on this forum then as I'm sure Google has the answer to everything?
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post #4 of 11 (permalink) Old Jun 20th, 2014, 04:58 PM
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Quote:
Originally Posted by emmajsx View Post
Hi, this is probably a really stupid question, but is it possible to change the run flat tyres on my 07 plate Mini Cooper S to normal tyres of the same size? There's probably already a tonne of threads for this on here but I'm new to this and obviously too stupid to work it, so if anyone could point me in the right direction that would be great, thanks! Emma

P.s. I realise I put flat runs instead of run flats in the title :|
Hi Emma

Yes You can change to non run flats not a problem,
As you say stick to the same size you will be fine.
Most guys carry a can of tire wield/repair in the boot Incase you get a flat, you can get this from halfords.

Don't mix RF with non RF tires and when you get your tires fitted make shore you reset you tire pressure monitor system,

Hope this helps
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post #5 of 11 (permalink) Old Jun 20th, 2014, 05:22 PM
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Yes you most definitely can and you will notice a huge difference on the ride quality. Just make sure you check your tyre pressure more often than you did with run-flats, as normal tyres do tend to loose pressure faster than the run-flats.
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post #6 of 11 (permalink) Old Jun 27th, 2014, 09:21 PM
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But in the interests of full disclosure...

People who know far more than me about tyres and wheels tell me that current Run Flat spec models are shipped with EH2 alloy wheels (Extended Hump 2) which is a lip on the outside of the rim that keep a run flat attached in the event of a puncture.

A conventional tyre is, I am told, perfectly safe on a run flat alloy up until the moment of a blow out when the aforementioned lip could make a NRF tyre potentionally more prone to consciously uncoupling itself from your wheel.

Makes no odds to me as my feels are flat spotted, the shape of 50p pieces, near cracking and generally knackered bar my off-side rear so I'm going to get new alloys to go with my new NRF rubber when the time comes since they're shot.

This isn't my opinion, just what I am told and what I've read and I'm sure I know less than many people on here. I would just try to gather some info from maybe a smaller garage, a Mini main dealer, and a few bigger tyre places, and when they tell you something different to what you've heard elsewhere, put it to them.

There are different opinions depending on who you ask, and they can't all be right. But if there is a chance it's less safe, I'd rather know about it and then make my judgement with that in my mind. It's probably a small chance.

But then again, thanks to run flat tyres, Cooper S suspensions, and chronic pot-holed roads I was driving around on a completely cracked alloy for God knows how many months - and that can't have been that safe!

I just wish there was some definitive answer. But at less than 400 sheets for some 17" alloys that don't look like Wolfrace budget specials from places like Wheelbase and such (I don't work for them!) it's not much of a dent to have it looking a bit tasty with something in gun metal grey and to your taste as I find the Mini wheels all look a bit chronic - especially at the ridiculous prices they charge to replace 17" Flames like I have.

So in short, no answers here, but it might be worth consulting a wider field of opinions rather than just saying sling them on. I have read (unvalidated potentially manufactured and elaborated horror stories, admittedly) that if you put conventional rubber on a car made for RFT you need to notify your insurer about it.

Some insurers then ask if they are going on the OEM alloy originally made to take RFT tyres and demand you get a letter from BMW saying this is OK, and BMW say you can run a NRF tyres on the car, but only on a NRF alloy without the EH2 lip.

Like I say - before I get shot down(!) - this is just what I've read, heard and been told and I'm just giving you the "benefit" of my advanced state of confusion on the matter!

But for the sake of 400 snots, I'd buy myself some cheapo but OK-looking after-market alloys.

Cheerio...
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post #7 of 11 (permalink) Old Jun 28th, 2014, 12:00 PM
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As you do say, you may be repeating nonsense - the benefit of the internet is that you can read stuff at home that you used to have to stand next to a drunk bloke in the pub to hear.....

A comparison between H2 (ordinary, in red) and EH2 (fun-flat, in blue) rim profiles is shown below from a SEAT workshop manual:



You can see that the wider seat and hump on the EH2 rim makes it harder for a deflated tyre bead to fall off. Not impossible, but less likely to happen than on an ordinary rim.

So a non-runflat tyre on a runflat rim will only be a little safer than all the other cars than have non-runflat tyres.

And remember, runflat tyres offer absolutely no protection from attack by either tigers or sharks - you may be lulled into a false sense of security by all this talk of safety and then find you are completely and utterly vulnerable to shark/tiger attack.
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post #8 of 11 (permalink) Old Jun 28th, 2014, 02:56 PM
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Woah...

Absolutely no protection against tigers? Hell's bells.

Well they aren't the conditions under which I bought the car. What's Anne Robinson's number?

Well, if nothing else my piece did get that comprehensive response which cleared a few things up in my mind, anyway!

Plus I've had reason to have a BMW Assist chap out today for an entirely different mechanical matter, but put the question to him and he said it was perfectly safe to put conventional rubber on an EH2 rim.

And thinking about it, in terms of notifying your insurer about it, who's to say it didn't have conventional rubber on when you bought it.

As I say, I have to get some new wheels as mine are mullered anyway, and MINI rims are way too dear and cr@p-looking and I'll no doubt have to replace at least one corner of my next set due to the roads around here! Any recommendations for the sub-500 a set region? And are there a specific few NRF tyre that runs well on a R56 MCS?

Wheel-wise I've been looking at some Inovit KE10s in gun-metal grey or something of that ilk. It's always hard guessing what would look nice in situ.

Apologies if these have been handled well elsewhere.

Cheers to the previous poster for their addition - good points well (and charmingly) made!
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post #9 of 11 (permalink) Old Sep 13th, 2014, 10:10 AM
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There are different opinions depending on who you ask, and they can't all be right. But if there is a chance it's less safe, I'd rather know about it and then make my judgement with that in my mind. It's probably a small chance.
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post #10 of 11 (permalink) Old Sep 18th, 2014, 10:55 PM
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The illustration just shows it's more about the effect on the rim from the tyre rather than the effect on the tyre from the rim, they had to strengthen the rim, in which case, using non rft's cannot be a detriment to safety of the rim.

Some dealers are telling customers the suspension has been calibrated for use with rft's and they should not be swapped for non. Swapping away from rft's will change the suspension feel due to the sidewall or carcass strength anyway. I think the (firmer if at all) suspension from a rft car is complimented by non rft tyres, which maybe is why so many are overly pleased?

Who knows, but not all BMW cars have rft tyres, so I don't believe what the dealers say, the staff just don't know what to say I suspect, as they are not allowed to express their own opinion in case one of us holds them responsible for something, they have some sort of dealer approved ******** to state.

I like the idea of tyres staying up, but I do not like the crashing suspension feel or the stupid price hike, my car drives so much better without them.
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post #11 of 11 (permalink) Old Nov 15th, 2014, 04:58 PM
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i just removed the old run flats and fitted yokohama c-drive tyres and the ride is much better on 16"s

i had a S on 17s a while ago and the ride on run flats was terrible
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