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    Emerg Wheel/collapsible spare tire question 1000

    Just received an emergency wheel/collapsible spare tire (185/60/17) from Sunset who tell me when in use to inflate to 60 psi. That seems a bit high. Has anyone heard to the contrary? ( I tried to search but my browser won't let me do diddly-squat)

    Thanks.

    Re: Emerg Wheel/collapsible spare tire question 1

    Here's both answers to the two types of spares.

    Sunset seems to have it confused for both types of tires; looks like yet another case of somebody advising without knowing he's wrong.

    Re: Emerg Wheel/collapsible spare tire question 1

    MMD: Is that a 996 or a 997 user's manual?

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    ADias said:
    MMD: Is that a 996 or a 997 user's manual?



    Yes, it is a 996 manual. No problem though because the _collapsible_ spare for the Carrera 4 and 4S (the only one which will fit in a 997's trunk) has a 996 part number and is _approved_ for use by Porsche and PCA for use on 997s.




    Actually the Carrera and Targa spare WILL fit in a _997/S_ but it's got near zero clearance and must be radically slanted. Not sure if it fits Turbo 997 or 997C4.

    Neither spare fit over Turbo PCCBs. I've _heard_ collapsible will fit normal 997s with PCCBs; other "doughnut" spare will not fit over any PCCBs.

    Re: Emerg Wheel/collapsible spare tire question 1

    Much appreciated MMD. 60 just didn't seem right.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    Circe said:
    Much appreciated MMD. 60 just didn't seem right.



    No problemo. Keep in mind you gotta go really slowly (fewer than 50mph?) if you ever use it.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    MMD said:
    Quote:
    ADias said:
    MMD: Is that a 996 or a 997 user's manual?



    Yes, it is a 996 manual. No problem though because the _collapsible_ spare for the Carrera 4 and 4S (the only one which will fit in a 997's trunk) has a 996 part number and is _approved_ for use by Porsche and PCA for use on 997s.




    Actually the Carrera and Targa spare WILL fit in a _997/S_ but it's got near zero clearance and must be radically slanted. Not sure if it fits Turbo 997 or 997C4.

    Neither spare fit over Turbo PCCBs. I've _heard_ collapsible will fit normal 997s with PCCBs; other "doughnut" spare will not fit over any PCCBs.



    I thought so. So... you are saying that a 996 C4 collapsible (the one I have currently) will fit the 997S even w/ PCCBs.

    I'm still wondering if it will not put a strain on the differential due to having a smaller circumference.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    ADias said:


    I thought so. So... you are saying that a 996 C4 collapsible (the one I have currently) will fit the 997S even w/ PCCBs.

    I'm still wondering if it will not put a strain on the differential due to having a smaller circumference.



    Hey Buddy, No problem with diff diameters (997 _tire_ diameter is one inch greater than 996 _tire_ diameter). You'd think that there would be one, but no, we're lucky. Here's what Porsche club expert says to this question:
    ------------------------------------

    I have studied all the comments on using a 996 space saver spare on the 997, but haven't seen any comment on the diameter issue of fitting a spare designed to substitute for an 18 inch wheel on a car originally outfitted with 19 inch wheels. Will it work and will there be no adverse consequences with computers,
    differential, etcetera ?
    Thanks,
    John


    Porsche actually has a spare tire and boot cover for the 997. The part number is 99636202003 for the tire and is in the parts film under wheels for the 997.

    If you order the cermaic brakes you will need the larger wheel, part number 99636202002 and that is 725.29.

    Peter Smith - PCA WebSite - 2/9/2007

    ------------------------------------------

    As far as the collapsible fitting over 997/S PCCBs? I _heard_ that it will. You'd have to find out for sure by getting confirmation. The above latter comment by Peter Smith seems to confirm that.

    I _know_ from personal experience it will fit over 997/S red and black calipers.

    Re: Emerg Wheel/collapsible spare tire question 1

    Ok. Good research work. I'll check w/ my PCA buddies just to make sure.

    The circumference delta between the 996 wheels and the 997 wheels is not trivial. There will be assymetrical loads on the diff, but it may be OK for short stints.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    ADias said:
    Ok. Good research work. I'll check w/ my PCA buddies just to make sure.

    The circumference delta between the 996 wheels and the 997 wheels is not trivial. There will be assymetrical loads on the diff, but it may be OK for short stints.



    Yeah, no joke, sounded freaky at first that Porsche would officially allow the use of the smaller dia. 996 unit.

    My guess is the "no-faster-than-50mph" requirement for using the spare should be given the same respect as The Laws of Physics.


    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    MMD said:
    My guess is the "no-faster-than-50mph" requirement for using the spare should be given the same respect as The Laws of Physics.





    MMD: the 50MPH was already a limit when it was used on a 996 with matched circumferences. That limit has to do with smaller tire patch and the weaker structure of the spare tire. On top of that there is a pronounced asymmetry due to circ. diff on a 997.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    ADias said:
    Quote:
    MMD said:
    My guess is the "no-faster-than-50mph" requirement for using the spare should be given the same respect as The Laws of Physics.





    MMD: the 50MPH was already a limit when it was used on a 996 with matched circumferences. That limit has to do with smaller tire patch and the weaker structure of the spare tire. On top of that there is a pronounced asymmetry due to circ. diff on a 997.



    Wow! You are good ADias, reeeeally good! I would never have thought of that.

    Dammit: it seems for us using that spare would be like driving a crippled car at..., say..., 45 max (?) mph.

    Re: Emerg Wheel/collapsible spare tire question 1

    MMD: This lack of spare tires on sports cars is becoming a common annoying thing. Even when run-flats are used (and PAG does not recommend them) they are also limited to 100 miles, not very good when the next tire center is 300/500 miles away.

    My dealer does not recommend a spare. I know that psychologically that is not good, as we all prefer a security blanket. I have to agree with them that these days a tire problem is rare, so living with the statistics is not so dire.

    I watch my tires (visually) very often and keep them at the right pressure and I think that helps. As far as road hazards, I'm also careful where I drive and watch for debris on the side of the road. Punctures normally (not always) happen on rear tires by screws/nails jettisoned by the front wheels when the car drives above a certain speed. There's a particular freeway exit near where I live with a traffic light. I'm often forced to stop there. To the left and the right of my lane there's an array of debris which includes cutting blades, nails, bolts and screws. I imagine those accumulate there having dropped from the back of contractors' pickup trucks (there's always a lot of construction in the area). I watch that area like a hawk and always drive through it very slowly.

    Re: Emerg Wheel/collapsible spare tire question 1

    I owe a LOT that I have learned on this spare tire subject to MMD. And thus a THANK YOU (again) is given.

    His grasp of accurate knowledge, comments, and photos / documentation is INCREDIBLE.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    1st997 said:
    I owe a LOT that I have learned on this spare tire subject to MMD. And thus a THANK YOU (again) is given.

    His grasp of accurate knowledge, comments, and photos / documentation is INCREDIBLE.



    LOL! Nah, you're too kind. A few years ago when I just got my brand new ___spareless___ M3 and two days later I had a friggin' flat.

    Funny nobody at dealership bothered to tell me there was no spare in M3s anymore when I ordered it (because of big muffler).

    Anyway it RUINED my whole day (a complicated busy day too!). I VOWED never to get stuck like that again; fifteen minutes on the side of the road and I could have salvaged most of the day. That self-promise and a bit of anxiety about always being prepared makes me informed about the spare.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    1st997 said:
    I owe a LOT that I have learned on this spare tire subject to MMD. And thus a THANK YOU (again) is given.

    His grasp of accurate knowledge, comments, and photos / documentation is INCREDIBLE.



    Agreed. MMD is always at the forefront with meaningful contributions.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    Circe said:
    Quote:
    1st997 said:
    I owe a LOT that I have learned on this spare tire subject to MMD. And thus a THANK YOU (again) is given.

    His grasp of accurate knowledge, comments, and photos / documentation is INCREDIBLE.



    Agreed. MMD is always at the forefront with meaningful contributions.






    Disclaimer: Please notice I know next to nothing about numerous and vast areas of The Porsche Universe. E.g. I can't explain the hydraulics of Variocam, I know nothing about racing, know zero about "motronics," PWIS and CAN, can't discuss anything except as an informed amateur and _consumer_ of the cars I've actually owned.

    OTOH, for example, I read about how the turbochargers are lubricated the other day and found it very interesting.

    Re: Emerg Wheel/collapsible spare tire question 1

    I always keep a spare in my car for any type of trip out of town. I have a 997S with PCCB and use the non-collapsible spare - 99636202002 (found it on ebay - un-used from an '02 Carrera - for $150). It works and fits the PCCB just fine. I prefer it over the collapsible spare. I store it in front, packed tightly with a duffelbag (luggage). SunSet Porsche (bless them!) supplied the foam-insert that fits inside the wheel to secure the tool and jack, which they also supplied. I always travel with a torque wrench to make certain the wheels are secure (when was the last time you checked your tire pressure much less the wheel studs torque?)

    Keep in mind that regardless of the type of spare you have you should always only mount them on the FRONT. If you have a flat in the rear you need to move the front tire to the rear and put the spare on the front. Don't put the spare on the REAR, ever. This is well documented. (And yes, a large garden trash bag is best used to contain the flat tire and wheel which will need to be stored in the back seat.)

    Personally I would never use the goop tire repair kit which Porsche includes.

    I do keep a tire repair kit (plugs) in the car. You may be able to install a plug and complete your journey (but you will need to remove the tire to do this so a jack and a spare are still a good idea) or at least be mobile on regular size tires until you find a replacement. A correctly plugged tire that is not leaking air is much safer than a spare to complete your journey, especially at 60mph (OK, I am ready for the hate mail from the safty rennteam patrol - but first drive with the spare at over 50 mph and tell me what you think).

    If you don't know how to plug a tire (or how to tell when a puncture can be plugged) and you are man enough then stop by you local filling station or tire dealer and have them show you how - I would not try to do this the first time on you own without instruction and a basic understanding.
    -AS ALWAYS - a plugged tire should be replaced as soon as possible and can no longer be used at high speeds.

    Can you tell I am serious about covering long distances without interruptions? (anyone want to co-drive an attempt to break the NY to LA record just set by a Ferrari 550?)

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    Leawood911 said:


    Personally I would never use the goop tire repair kit which Porsche includes.





    Oh Gee..., I wonder why you feel that way?

    Re: Emerg Wheel/collapsible spare tire question 1

    "Goop" is a latin word for Fing PITA.

    Re: Emerg Wheel/collapsible spare tire question 1

    Oh, BTW, interesting post Leawood911.

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    Leawood911 said:...Keep in mind that regardless of the type of spare you have you should always only mount them on the FRONT. If you have a flat in the rear you need to move the front tire to the rear and put the spare on the front. Don't put the spare on the REAR, ever. This is well documented....



    This may only be true for 997s and it may have to do with the circumference diff I raised before, when using the smaller circumference 996 spare on a 997. PAG has no directives for 997s obviously, and there is no such directive for 996s.

    If this is indeed required on 997s - and it may be, it is a major hassle. In my experience punctures are more frequent on rear tires, given the dynamics of how a nail/puncture usually happens.

    If this is a requirement, I think that using a 996 spare on a 997 is quite impractical for most people; it's just not worth the trouble especially given the low probability of the event.

    If there is a significant critical mass of 997 19" rim owners who insist on a spare, I suggest those people should demand PAG to sell them a 19" spare with a tire with the same circumference as the regular tire.


    P.S. - If this is a requirement due to the circumf. diff, then the 996 spare cannot be mounted on the front axle of a C4S (or a 997TT) given its front-differential.

    Re: Emerg Wheel/collapsible spare tire question 1

    It is not a circumference issue at all. It's a width issue. Replacing a 295 rear (11 inch wide wheel) with such a skinny spare wheel makes the rear really, really nervous at any speed. I know, as I did not know to put the spare on the front the first time I had a flat on the rear in my 996. When I ran accross the recommendation to move the spare to the front I totally saw the light.
    I routinely get in my car and cover 1500+ miles in 20 hour blasts by myself just for grins. If I have a flat on the rear and have my choice of waiting for (four+) days for a new tire and be stranded or move a couple of wheels and be back on the road I will not waste any time changing tires. I bet I can do the whole change (front to rear and spare on front) in less than 10 minutes without breaking a sweat. Not having a spare is totally out of the question for me. For long road trips I take all kinds od spares and extra tools with me - headlight bulbs, fuses, spare quarts of oil and coolant (specific types can be hard to find on the road), laptop with Durametric software (allows the co-pilot to monitor all types of engine parameters in real time). I also pack a first aid kit!

    If you are really lazy I bet you could call Porsche roadside assistence to come and change the tires for you!
    The only benefits I can see by not having a spare are $ savings and weight savings for Porsche. Maybe you don't drive many miles and hence do not get many flats. I drive around 20K miles per year and all the new monster homes being built around my neighborhood cause many nails on the streets .

    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    Leawood911 said:
    If I have a flat on the rear and have my choice of waiting for (four+) days for a new tire and be stranded or move a couple of wheels and be back on the road I will not waste any time changing tires. I bet I can do the whole change (front to rear and spare on front) in less than 10 minutes without breaking a sweat. Not having a spare is totally out of the question for me. For long road trips I take all kinds od spares and extra tools with me - headlight bulbs, fuses, spare quarts of oil and coolant (specific types can be hard to find on the road), laptop with Durametric software (allows the co-pilot to monitor all types of engine parameters in real time). I also pack a first aid kit!





    YUP! Sounds good to me. Got the First Aid kit, got H2O, got "Power Bars," got blanket, flashlights, flares, toolz, etc. etc.; no coolant, no durametric.

    Oh, know CPR.


    Re: Emerg Wheel/collapsible spare tire question 1

    Quote:
    Leawood911 said:
    It is not a circumference issue at all. It's a width issue. Replacing a 295 rear (11 inch wide wheel) with such a skinny spare wheel makes the rear really, really nervous at any speed. I know, as I did not know to put the spare on the front the first time I had a flat on the rear in my 996. When I ran accross the recommendation to move the spare to the front I totally saw the light.
    I routinely get in my car and cover 1500+ miles in 20 hour blasts by myself just for grins. If I have a flat on the rear and have my choice of waiting for (four+) days for a new tire and be stranded or move a couple of wheels and be back on the road I will not waste any time changing tires. I bet I can do the whole change (front to rear and spare on front) in less than 10 minutes without breaking a sweat. Not having a spare is totally out of the question for me. For long road trips I take all kinds od spares and extra tools with me - headlight bulbs, fuses, spare quarts of oil and coolant (specific types can be hard to find on the road), laptop with Durametric software (allows the co-pilot to monitor all types of engine parameters in real time). I also pack a first aid kit!

    If you are really lazy I bet you could call Porsche roadside assistence to come and change the tires for you!
    The only benefits I can see by not having a spare are $ savings and weight savings for Porsche. Maybe you don't drive many miles and hence do not get many flats. I drive around 20K miles per year and all the new monster homes being built around my neighborhood cause many nails on the streets .



    In many years of operation of my 996 C4 I had a single puncture (in a rear tire) and it occurred yards from my driveway. I guess we live in the same type of neighborhoods.

    I did install the spare in the rear and drove without any problem whatsoever 15 miles to my specialist tire shop.

    I constantly drive long road trips (2000+ miles) here out West and never had a tire problem.

    You all are discounting the circumference diff. between the 996 18" wheels and the 997 19"wheels and its deleterious effect on differentials. Do not blame me if your diff fries.

    Re: Emerg Wheel/collapsible spare tire question 1

    I just want to eliminate any confusion... .

    There is _no_ problem with using the 996 spare on the 997 (different wheel and tire diameters). I guess, to be safe (in more ways than one) just keep speed under 50mph.

    It's been officially approved by Porsche and even the Porsche Club of America for a few years now.

     
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