MINI2

simonm · Sep 6th, 2007, 07:15 PM

Today I had my second set of 'ordinary' tyres fitted to my Cooper S. I was asked by the garage to sign a disclaimer absolving them of any responsibility for not fitting the reccomended runflats. The boss man then proceeded to tell me a horror story of how because S-lites are runflat rims that under heavy braking the tyre could slip on the rim and cut of the valve. It's not like he was trying to sell me the more expensive runflats as he'd already fitted the new ones.

This has made me think now. Has anybody else on the board heard stories like this? I'm guessing that generally everyone's happy with tyres with a bit of give, I know I am.

As an aside I fitted Toyos again. What a great tyre and from tryetraders they were V cheap too.

Interested to know what you guys think, maybe put my mind at rest.

Damo · Sep 6th, 2007, 08:00 PM

To be honest he's talking rubbish. If the tyres ever slipped it had nothing to do with the Rim being a run flat. And preety sure even if it did it would not effect the valve.

The runflats on a MINI are designed to fit ANY wheel, not specialist wheels. The design of S lites I think has a lip to increase the amount of air over a normal wheel to improve the ride. Not even sure it has that to be honest.

Rakey · Sep 6th, 2007, 09:44 PM

The tyre isn't even connected to the valve, so how the hell it slipping could cause the valve to slice off is daft

Fevs · Sep 6th, 2007, 10:25 PM

Quote: Originally Posted by Rakey (original)

The tyre isn't even connected to the valve, so how the hell it slipping could cause the valve to slice off is daft

well said mate load of bolox

rims are rims as far as i am aware but dont hold me to it its the tyre that is a run flat with the special side wall to hold it up and the bead seats on the wheel are just the same

but i maybe wrong and i am sure someone will come along and gun me down

wibbly · Sep 6th, 2007, 10:45 PM

Strangely enough I was talking to the guy at Camskill today as I ordered 2 new tyres, and he asked me if I wanted runflat tyres and what wheels I was running on the car as runflats and 'aftermarket wheels' don't mix! Perhaps there is some truth (or rumour mongering in it) after all...

As it was I ordered 2 standard tyres anyway, so didn't persue it with him

MINIAC · Sep 6th, 2007, 11:02 PM

Actually wheels have what is called a hump profile ... a bump put on the bead seat to prevent the tire from sliding off the wheel while the vehicle is moving. To ensure a run flat tire does not come off a wheel when running with zero pressure, the wheel must have a EH2 or EH2+ hump profile.

simonm · Sep 7th, 2007, 07:49 AM

Thanks guys, I'll take it that he was talking rubbish.
Up until then I've always felt 100% confident that I could chuck my MIN in at 10/10ths and it would come out the other side, and he put a doubt in my mind, but that's gone now.

Martin F · Sep 7th, 2007, 07:55 AM

Quote: Originally Posted by MINIAC (original)

Actually wheels have what is called a hump profile ... a bump put on the bead seat to prevent the tire from sliding off the wheel while the vehicle is moving. To ensure a run flat tire does not come off a wheel when running with zero pressure, the wheel must have a EH2 or EH2+ hump profile.

So, if I understand correctly, the converse is never fit runflats to aftermarket wheels unless you are sure they are EH2 or EH2+

Fu Manchu · Sep 7th, 2007, 08:07 AM

My experience is this.

OEM rims and none run flats - No problem, and never heard of anyone with one. Have heard lots of stories of tyre fitters talking nonsense about using non runflats though.

Aftermarket rims and runflats - Depends on the rim and runflats. The quote below is a post I made some time ago when I was hoping to use the run flats that came on my new MINI on aftermarket alloys.

Quote:

That appears to depend on the brand of runflat. The dunlop website for runflats clearly states that their tyres can be mounted on any rim. See the DSST section of the link below.

Dunlop Tyres UK

I asked the same question of pirelli with a view to using the runflats off my new Cooper on aftermarket alloys. Pirelli sent me the following reply via email.

"Thank you for your enquiry.
These tyres are recommended to be fitted to EH2 (Double extended Hump)
rims but, are permissible to be fitted to H2(Double Hump) rims."

This may help clear up a few things. I have to admit Pirelli's response didn't fill me with confidence.

The technical people can hopefully fill us in on humps and extended humps.

Damo · Sep 7th, 2007, 11:30 PM

So you CAN use a runflat with an aftermarket rim, but don't expect it to work as a runflat when it goes flat. Can't be an issue when its working as a normal tyre fully inflated

Sep 6th, 2007, 07:15 PM	#1
simonm MINI2 Newbie Join Date: Apr 2002 Location: Dunstable, Beds Local Time: 12:47 AM Posts: 41 Offline	Disclaimer for not fitting runflats Today I had my second set of 'ordinary' tyres fitted to my Cooper S. I was asked by the garage to sign a disclaimer absolving them of any responsibility for not fitting the reccomended runflats. The boss man then proceeded to tell me a horror story of how because S-lites are runflat rims that under heavy braking the tyre could slip on the rim and cut of the valve. It's not like he was trying to sell me the more expensive runflats as he'd already fitted the new ones. This has made me think now. Has anybody else on the board heard stories like this? I'm guessing that generally everyone's happy with tyres with a bit of give, I know I am. As an aside I fitted Toyos again. What a great tyre and from tryetraders they were V cheap too. Interested to know what you guys think, maybe put my mind at rest.

Sep 6th, 2007, 10:25 PM	#4 (permalink)
Fevs heading north !!!! Join Date: Aug 2003 Location: on the move Local Time: 01:47 AM Posts: 8,897 Offline	Quote: Originally Posted by Rakey (original) The tyre isn't even connected to the valve, so how the hell it slipping could cause the valve to slice off is daft well said mate load of bolox rims are rims as far as i am aware but dont hold me to it its the tyre that is a run flat with the special side wall to hold it up and the bead seats on the wheel are just the same but i maybe wrong and i am sure someone will come along and gun me down Global motivator

Sep 6th, 2007, 10:45 PM	#5 (permalink)
wibbly In my Classic Mk 1 :) Join Date: Jan 2004 Local Time: 01:47 AM Posts: 6,473 Offline	Strangely enough I was talking to the guy at Camskill today as I ordered 2 new tyres, and he asked me if I wanted runflat tyres and what wheels I was running on the car as runflats and 'aftermarket wheels' don't mix! Perhaps there is some truth (or rumour mongering in it) after all... As it was I ordered 2 standard tyres anyway, so didn't persue it with him \| MINIaddiction \| \| For MIDLANDS Folk in their MINI's \|

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Is it OK to run non-runflats front and runflats back?	Darren S	Wheels, Tyres & Brakes	13	Feb 10th, 2008 06:22 PM
Fitting Runflats with InnerTubes ?	Restyle	Wheels, Tyres & Brakes	8	Feb 5th, 2007 10:57 AM
Rallying on the road?! (Disclaimer: Safety first)	Kodak	MINI Cooper S	9	Dec 22nd, 2004 01:53 PM
Nav System Disclaimer	donner	Faults & Fixes	4	Oct 16th, 2004 12:08 AM

MINI2

Fuel for your MINI obsession

For (almost) all things alloy, steel and rubber, plus upgrading your MINI's stopping ability

Today
Sponsors	Sponsored Links Registered members do not see Google Ads posts, they can also post messages, pictures, and classified adverts. Register your free account today and become a member of MINI2 - MINI Forum

Sep 6th, 2007, 08:00 PM	#2 (permalink)
Damo Disillusioned with MINI2 My Classifieds Join Date: Nov 2001 Location: MINItorque.com Local Time: 01:47 AM Posts: 10,449 Offline	To be honest he's talking rubbish. If the tyres ever slipped it had nothing to do with the Rim being a run flat. And preety sure even if it did it would not effect the valve. The runflats on a MINI are designed to fit ANY wheel, not specialist wheels. The design of S lites I think has a lip to increase the amount of air over a normal wheel to improve the ride. Not even sure it has that to be honest.

Sep 6th, 2007, 09:44 PM	#3 (permalink)
Rakey Banned My Classifieds Join Date: Apr 2003 Location: The local Local Time: 01:47 AM Posts: 44,139 Offline	The tyre isn't even connected to the valve, so how the hell it slipping could cause the valve to slice off is daft

Sep 6th, 2007, 11:02 PM	#6 (permalink)
MINIAC MINI Profiler Join Date: Feb 2001 Location: City By The Bay Local Time: 05:47 PM Posts: 7,547 Online	Actually wheels have what is called a hump profile ... a bump put on the bead seat to prevent the tire from sliding off the wheel while the vehicle is moving. To ensure a run flat tire does not come off a wheel when running with zero pressure, the wheel must have a EH2 or EH2+ hump profile.

Sep 7th, 2007, 07:49 AM	#7 (permalink)
simonm MINI2 Newbie Join Date: Apr 2002 Location: Dunstable, Beds Local Time: 12:47 AM Posts: 41 Offline	Thanks guys, I'll take it that he was talking rubbish. Up until then I've always felt 100% confident that I could chuck my MIN in at 10/10ths and it would come out the other side, and he put a doubt in my mind, but that's gone now.

Sep 7th, 2007, 07:55 AM	#8 (permalink)
Martin F Making it add up Join Date: Apr 2006 Location: Sussex Local Time: 01:47 AM Posts: 610 Offline	Quote: Originally Posted by MINIAC (original) Actually wheels have what is called a hump profile ... a bump put on the bead seat to prevent the tire from sliding off the wheel while the vehicle is moving. To ensure a run flat tire does not come off a wheel when running with zero pressure, the wheel must have a EH2 or EH2+ hump profile. So, if I understand correctly, the converse is never fit runflats to aftermarket wheels unless you are sure they are EH2 or EH2+

Sep 7th, 2007, 08:07 AM	#9 (permalink)
Fu Manchu Formerly HUMPH Join Date: Jun 2006 Location: In The Wind Local Time: 01:47 AM Posts: 2,466 Offline	My experience is this. OEM rims and none run flats - No problem, and never heard of anyone with one. Have heard lots of stories of tyre fitters talking nonsense about using non runflats though. Aftermarket rims and runflats - Depends on the rim and runflats. The quote below is a post I made some time ago when I was hoping to use the run flats that came on my new MINI on aftermarket alloys. Quote: That appears to depend on the brand of runflat. The dunlop website for runflats clearly states that their tyres can be mounted on any rim. See the DSST section of the link below. Dunlop Tyres UK I asked the same question of pirelli with a view to using the runflats off my new Cooper on aftermarket alloys. Pirelli sent me the following reply via email. "Thank you for your enquiry. These tyres are recommended to be fitted to EH2 (Double extended Hump) rims but, are permissible to be fitted to H2(Double Hump) rims." This may help clear up a few things. I have to admit Pirelli's response didn't fill me with confidence. The technical people can hopefully fill us in on humps and extended humps.

Sep 7th, 2007, 11:30 PM	#10 (permalink)
Damo Disillusioned with MINI2 My Classifieds Join Date: Nov 2001 Location: MINItorque.com Local Time: 01:47 AM Posts: 10,449 Offline	So you CAN use a runflat with an aftermarket rim, but don't expect it to work as a runflat when it goes flat. Can't be an issue when its working as a normal tyre fully inflated

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)