Runflat wheel with non-runflat tire ?
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Originally Posted by Peter530i' date='Oct 1 2005, 09:26 AM
thanks guys, that is what I thought, the rim is normal only the runflat tire is different. So sad that each BMW dealer gives me different answer. Some of them even in Munich mention that the rim is runflat too ????????
anyway, now can a size 225 tire be fitted to 17" style 122 rim (currently 245 size tire)
anyway, now can a size 225 tire be fitted to 17" style 122 rim (currently 245 size tire)
[snapback]177651[/snapback]
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Originally Posted by Peter530i' date='Oct 1 2005, 09:26 AM
thanks guys, that is what I thought, the rim is normal only the runflat tire is different. So sad that each BMW dealer gives me different answer. Some of them even in Munich mention that the rim is runflat too ????????
anyway, now can a size 225 tire be fitted to 17" style 122 rim (currently 245 size tire)
anyway, now can a size 225 tire be fitted to 17" style 122 rim (currently 245 size tire)
[snapback]177651[/snapback]
Originally Posted by IrishEyes' date='Oct 1 2005, 07:06 PM
No, I believe the rim is different for the run-flat tyres but is backward compatible so it will take a standard tyre. I think there is an inner lip on run flat rims to help keep a punctured RSC tyre on the rim. A standard rim will NOT take an RSC tyre. The sidewall keeps the tyre up and the modified rim keeps the tyre on.
?
?
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Originally Posted by AC_S5' date='Oct 1 2005, 04:45 PM
As to my understanding, the rim is a normal rim and it is the tire that is different.? The runflat tire have a harder tirewall and that what makes it run flat, but it cannot run forever without air so a monitor is in place to detect the lose in tire pressure.? The tire will eventually runflat because of the stress the car put on the tirewall that's why the runflats can only runflat for a certain amount of km.? If you say that the rim is modified to keep the tire on that the runflats should be able to runflat indefinitely.
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The run-flats actually are more than just tires. BMW calls the system RSC for ?Run-flat System Component.? This system consists of three parts: the tire with ultra stiff sidewalls, a special rim which prevents the tires from slipping off even if they deflate, and the inflation monitoring system.
So, by progression, on to the E60, the same system must be incorporated. All run-flat rims have modifications to allow the tyre to stay on. The BMW runflat wheels have an extra ridge on the inside of each tire bead to keep the tire from moving off the rim (to the inside) when they are running without air. Normal rims will not have this ridge on the inside and therefore should not be used with runflat tires, as the runflat tires may not perform as required when they have no air in them.
Don't forget, the run-flat is only a temporary solution. You seem to think that if the rim is modified, a run-flat tyre, in its deflated condition, would last indefinitely. If that was the case, why put air in, Or why do they recommend no more than 100kms when deflated?
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My Ride: In a place where the Mercedes density is the highest in the world (no. of MB per square kilometer) I choose a Bimmer, why? because of one thing "The Ultimate Driving Experience"
My Ride:
523i Steptronic, Silver Grey Exterior, Black Interior with Black Dakota Leather and Maple Wood Trim. Chrome Grill, Style 123 rim, Airbags everywhere, PDC, Rain sensor, Auto lights, Moveable front armrest, Advance Climate Control, Glass Sunroof, Auto dimming interior and exterior mirror with foldable functions, Extended Lights package, 6 CD changer in glove box, Power seats with memory, Power adjustable steering wheel, Power rear sunblinds.
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Originally Posted by IrishEyes' date='Oct 2 2005, 12:05 AM
[quote name='AC_S5' date='Oct 1 2005, 04:45 PM']As to my understanding, the rim is a normal rim and it is the tire that is different.? The runflat tire have a harder tirewall and that what makes it run flat, but it cannot run forever without air so a monitor is in place to detect the lose in tire pressure.? The tire will eventually runflat because of the stress the car put on the tirewall that's why the runflats can only runflat for a certain amount of km.? If you say that the rim is modified to keep the tire on that the runflats should be able to runflat indefinitely.
[snapback]177708[/snapback]
The run-flats actually are more than just tires. BMW calls the system RSC for ?Run-flat System Component.? This system consists of three parts: the tire with ultra stiff sidewalls, a special rim which prevents the tires from slipping off even if they deflate, and the inflation monitoring system.
So, by progression, on to the E60, the same system must be incorporated. All run-flat rims have modifications to allow the tyre to stay on. The BMW runflat wheels have an extra ridge on the inside of each tire bead to keep the tire from moving off the rim (to the inside) when they are running without air. Normal rims will not have this ridge on the inside and therefore should not be used with runflat tires, as the runflat tires may not perform as required when they have no air in them.
Don't forget, the run-flat is only a temporary solution. You seem to think that if the rim is modified, a run-flat tyre, in its deflated condition, would last indefinitely. If that was the case, why put air in, Or why do they recommend no more than 100kms when deflated?
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[/quote]I see, this is what the forum is for, I learn more everyday through discussion. But you can still put in a regular tire can you?
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Originally Posted by AC_S5' date='Oct 1 2005, 05:43 PM
I see, this is what the forum is for, I learn more everyday through discussion.? But you can still put in a regular tire can you?
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Originally Posted by AC_S5' date='Sep 30 2005, 07:36 PM
[quote name='?gent99' date='Oct 1 2005, 07:31 AM']I think this is accurate but for those of you leasing, I am pretty sure you need to turn the car in with runflats installed.? Something to keep in mind and check on in case I'm all wet.... :'(
Naturally, if your car came with runflats, this should apply...if not...then you're fine but I don't know which cars come with runflats and which do not.
Naturally, if your car came with runflats, this should apply...if not...then you're fine but I don't know which cars come with runflats and which do not.
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To answer the question, the runflat tire should have a RSC logo on the tirewall which stands for Runflat System Components
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[/quote]You didn't read my post carefully. I'm talking about turn-in time for folks leasing their cars. I believe the car must be turned-in with runflat tires installed.
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damn see guys, from what I read above it is still not 100% confirmed that a regular tire can be used on runflat tire fitted rim
I guess Iceman has to solve the mistery. Or someone who is good friends with their service manager. So far I did no get a proper response for official BMW sources
see guys, from what I read above it is still not 100% confirmed that a regular tire can be used on runflat tire fitted rim I guess Iceman has to solve the mistery. Or someone who is good friends with their service manager. So far I did no get a proper response for official BMW sources
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From: Dublin, Eire
My Ride: Collected Sept 2009 - BMW E90 M3, Silverstone II, Novillo Black leather, 19" M Double-Spoke alloys, High Beam Assist, Electronic Damper Control, Voice Control, PDC, USB, DAB, High Gloss Shadowline, Sliding armrest, Trim Finishing in aluminium grey.
Originally Posted by Peter530i' date='Oct 1 2005, 07:54 PM
damn see guys, it is still not 100% confirmed that a regular tire can be used on? runflat tire fitted rim
see guys, it is still not 100% confirmed that a regular tire can be used on? runflat tire fitted rim [snapback]177794[/snapback]
Otherwise, there are a number of us on the forum running with non-run flat tyres on run flat rims. ...
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Originally Posted by ?gent99' date='Oct 1 2005, 07:19 PM
You didn't read my post carefully.? I'm talking about turn-in time for folks leasing their cars.? I believe the car must be turned-in with runflat tires installed.
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Re the leasing, I can't see what it should bother them. I reckon the state they get some of the cars back in, the last thing they will worry about is what tyres are on them. Maybe it's a call to the leasing company to answer this.
