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Spare wheel dilemma

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mpowell
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2018/12/11 15:34:45 (permalink)

Spare wheel dilemma

Hi All
 
I have a Macan S on order but cannot wait for the delivery so have a 1 year old SD coming next week.   I have 2 questions and would welcome the input of members:
1.  There is no spare wheel and the OPC is quoting over £500 to supply one (believe it is the collapsible job), which seems a lot.  I would welcome thoughts on whether this purchase is necessary, whether a 3rd party wheel is available  or if alternative emergency solutions are any good.
2. My Macan has 19" wheels with air suspension, which is what I was looking for.  However it also has PASM fitted.  I have no idea what the benefit of this would be with the suspension setup.  Any members have this config or thoughts on how it should be used?
 
As I say any thoughts on the above would be greatfully received
 
Regards
 
Mark

19 Replies

Lancerlot
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Re: Spare wheel dilemma 2018/12/13 21:51:52 (permalink)
The spare wheel is a complete waste of money until you find yourself stuck in the middle of nowhere with a pothole puncture, then you'd give twice the amount to have one!  It fits beneath the boot deck, so doesn't detract much from the boot space and comes with a bespoke tool kit. I have it and have used it quite recently to get me out of trouble 
 
PASM provides continuously monitored suspension settings taking account of driving direction, speed, yaw velocity and lateral acceleration. It provides optimum ride comfort, handling and performance.
Regards,
 
Clive

The older I get - the faster I was!
Past - 924T, '911 SC, 911 C, 911 C2, 964, 996, 996TT, 997TT, 997GT2, 430 Scuderia, 997TT, 997TTS, 991.2TTS. Macan SD. Raleigh bike!
Ian Gilmour
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Re: Spare wheel dilemma 2018/12/15 18:51:49 (permalink)
My wife and her disabled mother were stuck in a car park 75 miles from home with a puncture.  So glad our Macan had a spare wheel that Porsche Assistance could use to get them home.  Personally, I would look to have a spare wheel in future cars.  Have you thought of sourcing one from somewhere like 9 Apart rather than your OPC?

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tiskev
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Re: Spare wheel dilemma 2018/12/16 19:25:43 (permalink)
you should get a second hand spare wheel and tyre for £100 or less
I have an 18 which i think would fit .It should not be a problem with measurement
as you would only need it to get you home.I carry a full size wheel in the Kn all the time.
It is pretty rare for your boot to be full and if it was you can always put on roof rack ? ?
Lancerlot
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Re: Spare wheel dilemma 2018/12/16 20:12:57 (permalink)
I personally wouldn't put an 18" rim on a car with 19" wheels as it will tend to wind up and potentially damage the transmission. 
Regards,
 
Clive

The older I get - the faster I was!
Past - 924T, '911 SC, 911 C, 911 C2, 964, 996, 996TT, 997TT, 997GT2, 430 Scuderia, 997TT, 997TTS, 991.2TTS. Macan SD. Raleigh bike!
tiskev
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Re: Spare wheel dilemma 2018/12/18 20:35:44 (permalink)
put it on the front 
 
tscaptain
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Re: Spare wheel dilemma 2018/12/18 22:16:28 (permalink)
Presumably it's not the size of the rim but the circumference of the tyre that matters?  That said the spare on the 928, for example, was much smaller than the others so I guess it would run without any problem to the transmission?  Maybe modern cars with all of their electronic gizmos are much more sensitive?

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mpowell
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Re: Spare wheel dilemma 2018/12/19 12:54:11 (permalink)
Thanks all for your input.
 
I decided the pain of not having a spare when disaster struck outweighed all other considerations.  As was said here, the spare does not take up any room in the boot, and you will only ever need it in extreme circumstances - but then would be grateful you have it.  So I bought one
 
Mark
Lancerlot
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Re: Spare wheel dilemma 2018/12/19 13:28:53 (permalink)
That decision should give you peace of mind and hopefully, you will never need to use it. 
 
As tscaptain so perceptively remarks, should the rolling radius of the 18" rim and tyre be the same as the 19", then there should be no problem, however this is not usually the case.
 
The drive system on the Macan connects all 4 wheels via the transmission (drive) system. It needs 3 differentials to cope with differing wheel speeds, side to side and front to back . There is also provision for limiting drive to any wheel that briefly loses traction.
 
The differential system is designed for transient situations, not ongoing long periods of differing wheels speeds on the same axle, which would confuse the electronics, leading to red warning lights, possible limp mode, poor handling and road holding plus the potential for transmission damage unlikely to be covered under warranty.
 
Just saying ……..  
 
Regards,
 
Clive    

The older I get - the faster I was!
Past - 924T, '911 SC, 911 C, 911 C2, 964, 996, 996TT, 997TT, 997GT2, 430 Scuderia, 997TT, 997TTS, 991.2TTS. Macan SD. Raleigh bike!
BigCat
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Re: Spare wheel dilemma 2018/12/19 18:36:57 (permalink)
Lancerlot
That decision should give you peace of mind and hopefully, you will never need to use it. 
 
As tscaptain so perceptively remarks, should the rolling radius of the 18" rim and tyre be the same as the 19", then there should be no problem, however this is not usually the case.
 
The drive system on the Macan connects all 4 wheels via the transmission (drive) system. It needs 3 differentials to cope with differing wheel speeds, side to side and front to back . There is also provision for limiting drive to any wheel that briefly loses traction.
 
The differential system is designed for transient situations, not ongoing long periods of differing wheels speeds on the same axle, which would confuse the electronics, leading to red warning lights, possible limp mode, poor handling and road holding plus the potential for transmission damage unlikely to be covered under warranty.
 
Just saying ……..  
 
Regards,
 
Clive    


Clive, my new Macan has 21 inch wheels but currently running on a 20 inch winter wheel set, however the collapsible spare is 18 inches. My previous Macan GTS with 21 inch wheels and the same 20 inch winter wheels had a 19 inch collapsible spare but that was because the PCCBs require extra clearance.
Lancerlot
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Re: Spare wheel dilemma 2018/12/19 19:02:48 (permalink)
Thanks Adrian. You can change the wheel diameter settings in your PCM. Your space saver spare has a smaller diameter rim in order to save space of course, but the folded tyre has a higher profile in order to retain the correct rolling radius when inflated. 
Regards,
 
Clive   
 

The older I get - the faster I was!
Past - 924T, '911 SC, 911 C, 911 C2, 964, 996, 996TT, 997TT, 997GT2, 430 Scuderia, 997TT, 997TTS, 991.2TTS. Macan SD. Raleigh bike!
Ziggycol
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Re: Spare wheel dilemma 2019/12/23 10:43:12 (permalink)
Hi
Just purchased a 2017 Cayenne S diesel with 21" wheels and no spare. Considering getting a space saver. Advice I've seen suggests that if the rolling radius is < 3% difference to the original wheels it is ok for a short distance emergency situation. Not sure what size space saver wheel/tyre should be to achieve this. Has anyone got ay experience and advice?
spook
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Re: Spare wheel dilemma 2019/12/23 12:31:26 (permalink)
Ziggycol - I have an unused Cayenne space saver off my 2013 Cayenne.  If  you are interested email me at macan@porscheclubgb.com  
stevehaley
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Re: Spare wheel dilemma 2020/08/09 01:53:41 (permalink)
Sorry to jump on this thread but does anyone know what size spare wheel will fit a 2017 cayenne s dielsel with an adblue tank?
Ziggycol
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Re: Spare wheel dilemma 2020/08/09 11:27:44 (permalink)
stevehaley
Sorry to jump on this thread but does anyone know what size spare wheel will fit a 2017 cayenne s diesel with an adblue tank?


Don't think anything other than a space saver will fit but I may be wrong as that's what I have. You'll need a 195/75/18 space saver. If searching for used it's useful to know that the same wheel is used by various manufacturers models so don't discount things like Audi Q5/7 and VW Touareg.

Col
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stevehaley
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Re: Spare wheel dilemma 2020/08/09 11:36:11 (permalink)
Thanks. 
will have a hunt on ebay. I thought a 19 might fit but found reference to having to remove the support arm For the wheel compartment As i dont have ceramic brakes i dont need it.
so much to learn especially as i had to buy it remotely from over 500 miles away so no dealer training etc.
 
Did spook sell you his spare wheel?
 
Ziggycol
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Re: Spare wheel dilemma 2020/08/09 13:44:38 (permalink)
stevehaley
Did spook sell you his spare wheel?


Yes he did, so that is not available for you. Keep looking on ebay - they do come up.

Col
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stevehaley
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Re: Spare wheel dilemma 2020/08/12 03:02:27 (permalink)
What did you do about the jack and tool kit. It looks like there should be two trays is that correct? ie something like these although this is missing a few things
https://www.ebay.co.uk/itm/VW-Touareg-7LA-2-5-R5-Jack-7L0011031B-Set/174215000531?hash=item289005f1d3:g:M6QAAOSwt3teZSL8
Do they just sit on the passenger side of the wheel well?
How is the spare secured down? Looks like there is a bolt on top of the adblu that you bolt it down with but with what?
Thanks
Stephen
 
 
Lancerlot
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Re: Spare wheel dilemma 2020/08/12 06:37:43 (permalink)
Here's the standard collapsible spare wheel set up in Macan.
Regards,
 
Clive

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The older I get - the faster I was!
Past - 924T, '911 SC, 911 C, 911 C2, 964, 996, 996TT, 997TT, 997GT2, 430 Scuderia, 997TT, 997TTS, 991.2TTS. Macan SD. Raleigh bike!
Ziggycol
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Re: Spare wheel dilemma 2020/08/12 08:54:56 (permalink)
stevehaley
What did you do about the jack and tool kit. It looks like there should be two trays is that correct? ie something like these although this is missing a few things
https://www.ebay.co.uk/itm/VW-Touareg-7LA-2-5-R5-Jack-7L0011031B-Set/174215000531?hash=item289005f1d3:g:M6QAAOSwt3teZSL8
Do they just sit on the passenger side of the wheel well?
How is the spare secured down? Looks like there is a bolt on top of the adblu that you bolt it down with but with what?
Thanks
Stephen

You can try and get those trays and appropriate jack etc. Personally I don't like standard screw jacks so I didn't bother and just invested in a small bottle jack. You need the knurled plastic nut to secure the spare wheel - again used commonly by Audi, VW, etc. so I found one on eBay. 

Col
Previously:
Audi S4 Avant
BMW M Coupe
Porsche 968 Sport
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