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Discussion Starter · #1 ·
For the most part, I don't mind not having a spare tire.

I live in a part of the world where I'm never without a cell phone signal so the AAA/Porsche service is within easy reach.

Plus I have a truck and car trailer.

So, for all my local driving, I wouldn't bother carrying a spare tire even if I had one.

But we have talked about doing a bigger tour around the USA. I know there are parts of this country where it would be better to have a spare tire on-board. So I'd really like to carry a spare tire, even if it's a pain in the neck and chews up space.

There are plenty of Porsche 911 "donuts" on eBay or craigslist, etc. for reasonable cost
(and I know Suncoast has spare tires too, but they're pricey).

Here's my question: Will a late 911 "donut" fit on a 718?

(maybe some of you guys who own both cars have tried this?)

Even if a 911 spare will only fit on the front of my 718 and I have to swap a front wheel/tire onto the back (in the event of a rear puncture), I'm OK with that.

And I know a normal 718 wheel/tire won't easily fit inside my Cayman. Again, I'm OK with that and am willing to stuff the flat tire in a garbage bag and bungee-cord the rear lid closed to drive to service, if need be.

I did an advanced search here and didn't see any definitive answers on this.
 

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For the most part, I don't mind not having a spare tire.

I live in a part of the world where I'm never without a cell phone signal so the AAA/Porsche service is within easy reach.

Plus I have a truck and car trailer.

So, for all my local driving, I wouldn't bother carrying a spare tire even if I had one.

But we have talked about doing a bigger tour around the USA. I know there are parts of this country where it would be better to have a spare tire on-board. So I'd really like to carry a spare tire, even if it's a pain in the neck and chews up space.

There are plenty of Porsche 911 "donuts" on eBay or craigslist, etc. for reasonable cost
(and I know Suncoast has spare tires too, but they're pricey).

Here's my question: Will a late 911 "donut" fit on a 718?

(maybe some of you guys who own both cars have tried this?)

Even if a 911 spare will only fit on the front of my 718 and I have to swap a front wheel/tire onto the back (in the event of a rear puncture), I'm OK with that.

And I know a normal 718 wheel/tire won't easily fit inside my Cayman. Again, I'm OK with that and am willing to stuff the flat tire in a garbage bag and bungee-cord the rear lid closed to drive to service, if need be.

I did an advanced search here and didn't see any definitive answers on this.
Also wondering about this since I'm planning a 4,000-mile-plus road trip in early June to some fairly remote areas in the upper Great Plains. Always good to know what the options are while planning ...

Anyone?
 

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Unless you really tear up the tyre, wouldn't the tyre sealing compound and air compressor supplied with vehicle be sufficient to get you to service or phone signal? Never had cause to use it over 3 boxsters now but often wondered how efficient the system is!
 

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The 718 Cayman parts catalog lists the emergency wheel as part #991 362 020 00 and boot as #996 361 521 00.
$620 for just the wheel at ECS. O-U-C-H!
 

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I guess I'm resurrecting an old thread but felt I had to chime in re: Spare Tire
I recently acquired an '09 Cayman S which will see some track day use and it has no spare.

Only about 1/3 of new cars now come with a spare. As others have mentioned they come equipped with a can of fix a flat and a small compressor. In my opinion these are useless. And from my experience you never get a puncture in a repairable location on the tire on a nice sunny day in a safe location right next to a tire shop.
My flats seem to happen at 4am on my way to the airport in a torrential rain.
I have quite a few cars and those that did not come with spares I've found donuts to fit. For instance the spare from my CTS fits both my street and track Vettes. I used to trailer my Vette to the track and always had extra tires with me. Now I usually drive it to the track and I carry a donut spare which came in handy a few weeks ago when one of my wheels cracked and also tore up my tire before I realized what had happened. I was able to borrow 2 slicks to finish out the weekend and use my donut spare for the drive home. I also found a low profile scissors jack and bought 3 of these. I welded a 1/2 drive socket to all the scissors jacks so I can use my breaker bar instead of the little handles that normally come with these jacks. In some cars I carry a lightweight aluminum Harbor Freight floor jack. If I'm driving locally during the day I'm not that concerned about a spare but as others have said for longer drives I don't leave home without a spare & a jack. I'm pretty sure the spare from my Boxster will fit the Cayman S. I've not yet looked at the bolt patterns or offsets but I think they'll probably fit. If I get ambitious I can just remove a Cayman wheel and test fit the Boxster spare. The Boxster spare is 17" my Cayman currently has 19" street tires and will probably run 18" track tires but in a pinch should not be an issue using the 17" donut in the event I can't find an 18" donut.
That's my take on spare tires.
 

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I'm pretty sure the spare from my Boxster will fit the Cayman S. I've not yet looked at the bolt patterns or offsets but I think they'll probably fit. If I get ambitious I can just remove a Cayman wheel and test fit the Boxster spare. The Boxster spare is 17" my Cayman currently has 19" street tires and will probably run 18" track tires but in a pinch should not be an issue using the 17" donut in the event I can't find an 18" donut.
That's my take on spare tires.

I believe the problem with fitting the 17" Boxster spare to your Cayman S would not be the bolt pattern or offset, but the size of the calipers fitted to the Cayman S.
The standard wheels with the CS is 19" due to the caliper size. The CS gets the 911 calipers. The standard 718 Cayman gets the caliper upgrade from the 981 S models. the standard wheels on the 718 is 18"


From experience washing the wheels on my CS with 20" wheels, it is a tight squeeze getting your fingers in there to clean the wheels around the calipers. it may not be as much of an issue on the rears as the calipers there are smaller. but you couldn't move a rear tire to the front due to the width of the wheel/tire. even if the 17" spare would fit the rear.
 
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aren't the overall diameters of the front and rear tires different?
On the 911, or the Boxster/Cayman? I don't think so; only widths (atypical) and offset (typical) are different.
 

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Discussion Starter · #12 ·

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I believe the problem with fitting the 17" Boxster spare to your Cayman S would not be the bolt pattern or offset, but the size of the calipers fitted to the Cayman S.
The standard wheels with the CS is 19" due to the caliper size. The CS gets the 911 calipers. The standard 718 Cayman gets the caliper upgrade from the 981 S models. the standard wheels on the 718 is 18"


From experience washing the wheels on my CS with 20" wheels, it is a tight squeeze getting your fingers in there to clean the wheels around the calipers. it may not be as much of an issue on the rears as the calipers there are smaller. but you couldn't move a rear tire to the front due to the width of the wheel/tire. even if the 17" spare would fit the rear.
aren't the overall diameters of the front and rear tires different?

putting these two together to comment on.


according to my sales guy, who is also a friend and fellow track rat, the wheels for the 718 are 1/2" wider than the wheels on the previous generation, and while i am positive this applies to the S/GTS i am 99.98% certain it is the same on the base models of the 718.



prior to delivery i was asking him about the wheels while hunting for a set of track wheels. i had found some older boxster wheels for sale locally pretty cheap and was checking to see if they would fit. like most wheels in the end it was a "buy em and see if they clear the brakes" scenario and i ended up passing on that set. i currently run volk wheels on the track and the fit just fine (they came from a cayman r).
 
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