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Old 01-29-2008, 07:21 AM
Rik Rik is offline
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Question Spare tyre (tire)

A couple of questions if I may for those of you with the knowledge.
I will shortly be changing my E53 for a 5 seat E70 which entails loosing my spare tyre. I will be dragged into the directional run flat era very reluctantly but I would like to buy a full size spare to carry in the back when I visit more remote places. The thing is what ??? My present E53 has 255/19's front and 285/19's rear with a 235/17 spare (same rolling radius). This works fine as the spare is rated for full load and speed of the car.
The E70 will have 275/20's front and 315/20's rear directional run flats. Any suggestions as to spec for the spare ? Would 245 55 18 (same rolling radius) do the job and would it have to be a run flat or could I use a 'real' tyre.
The other question is - can a directional run flat be run in the opposite direction in an emergency?
Thanks in advance for the loan of your brains!
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Old 01-31-2008, 01:11 PM
Rik Rik is offline
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Looks like the way to go is with a style 209 wheel and 255/55 18 non runflat tyre. Being only a 8.5 inch wide rim is should just about fit in the well in the back - after taking the carpet out of that area and probably the gas ram as well !! The diameter is about 9mm larger than both the 19 and 20 inch wheels even though this is basic OEM fitting for the E70 but should be OK for short term emergency use. My local dealer suspects I may get a few lights on the dash until the car 'learns' that this is not a fault but will cause no damage. He recommended that DSC be turned off initially.
I'm sure that I will not be alone in wanting a 'real' spare so will keep you informed how things go when the car arrives. I just hope that the floor goes down over the wheel - it will be close one way or the other. I'm sure it can be modded if only a few mm in it.
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