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Tobesetc
Barcelona


Joined: 02 Jun 2014
Posts: 1407
Location: West London, UK


PostPosted: Wed May 16, 2018 9:39 pm    Post subject: Spare wheel - anyone drive without it? Reply with quote

Does anyone take the view that even if they had a puncture they'd not use their spare wheel, and thus remove it?

Heard mention (here?) of freeing up space and reducing weight... The space would actually be useful on some trips. Not sure I'd risk it, though.

What does the hive mind think?
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993 C4, Coupe '94 manual
Previous - '03 986 Boxster S

Last edited by Tobesetc on Wed May 16, 2018 9:56 pm; edited 1 time in total
 
  
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ColinC
Österreich


Joined: 16 May 2013
Posts: 978
Location: Sunny Central Scotland


PostPosted: Wed May 16, 2018 9:48 pm    Post subject: Reply with quote

I read somewhere that the space saver insitu adds to the structural rigidity of thr car in the event of frontal impact............maybe this was because it was in place when they did the crash test originally Dont know
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AVI_8
Silverstone


Joined: 19 Jan 2014
Posts: 113
Location: Prestwick


PostPosted: Thu May 17, 2018 12:01 am    Post subject: Reply with quote

ColinC wrote:
I read somewhere that the space saver insitu adds to the structural rigidity of thr car in the event of frontal impact............maybe this was because it was in place when they did the crash test originally Dont know


That’s correct and with the fuel tank just behind it it’s really not worth the weight saving.
 
  
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Tobesetc
Barcelona


Joined: 02 Jun 2014
Posts: 1407
Location: West London, UK


PostPosted: Thu May 17, 2018 6:49 am    Post subject: Reply with quote

I have to hope that stories of the spare wheel adding strength are an urban myth!

Firstly, it's held in place with a tiny spindle, so it will just pop out the instant there's any sort for structural deformation.

If it doesn't pop out, it'll just pass forces through towards the lower bulkhead when that area crumples.
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AVI_8
Silverstone


Joined: 19 Jan 2014
Posts: 113
Location: Prestwick


PostPosted: Thu May 17, 2018 10:01 am    Post subject: Reply with quote

I think you’d find that far from popping out in the event of a heavy front impact the wheel would be very much held in place by the deformed metal surrounding it and yes it would pass the forces through to the structure behind but it would do that evenly.
I’ve been in a head on collision before (not in a 911) due to an eejit taxi driver trying to overtake a large puddle and was very thankful of the metal out front that day, 3 days in hospital with a broken sternum was a tad painful though.
 
  
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gunner
Hockenheim


Joined: 04 Jul 2014
Posts: 676
Location: Kent


PostPosted: Thu May 17, 2018 11:52 am    Post subject: Reply with quote

I leave it in place, mainly so I could use it, but secondly because low at the front is not where I'd be trying to save weight.

Follow up question though, anyone actually tried inflating theirs recently?
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Tobesetc
Barcelona


Joined: 02 Jun 2014
Posts: 1407
Location: West London, UK


PostPosted: Thu May 17, 2018 1:18 pm    Post subject: Reply with quote

Good question - mine doesn't ever look to have been inflated. Given that tyres go hard around 5-10 years...what chance a 24 year old deflated unit? Nice hard skinny tyre...mmmm!

It looks temptingly like the right size to store two sleeping bags on my upcoming LM24 trip...

And on the curve-ball subject of crash strength, I'm with the Illuminati...

http://911uk.com/viewtopic.php?t=78799
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AVI_8
Silverstone


Joined: 19 Jan 2014
Posts: 113
Location: Prestwick


PostPosted: Thu May 17, 2018 5:27 pm    Post subject: Reply with quote

It seems the illuminati are divided also. On the subject of spare tyre inflation I presumed it was a one time use tyre, mine only just fits in and no more past the battery, I would have thought that once inflated it would be difficult to deflate enough to get it to fit in again.
Personally I think I’d call the AA if I got a puncture and get towed home, a whole lot less hassle
 
  
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Dream911
Indianapolis


Joined: 24 Dec 2008
Posts: 2409
Location: London


PostPosted: Thu May 17, 2018 6:49 pm    Post subject: Reply with quote

I have mine but wouldn’t really want to have to rely on it should I get a puncture.

I have the foam insert from a boxster to hold the jack neatly in the spare wheel so if I got rid of the wheel I’d need to start hunting for the infamous bag for the jack. Grin
 
  
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AndyS
Barcelona


Joined: 25 Mar 2010
Posts: 1429
Location: The fast lane


PostPosted: Thu May 17, 2018 7:57 pm    Post subject: Reply with quote

Some interesting responses on Tobe's link. I particularly like this one from Chris W:

Chris W wrote:
Back on topic, do you all know how to refit the spacesaver in the very small space? Its useful to know!

You take the valve out using the special valve cap. It has a valve core tool on the other end. Take this out completely to allow the tyre to FULLY deflate. Sit on it, hug it, get all the air out you can.

Squeeze the spacesaver back in the hole, without the valve core it will compress.

Once in situ then replace valve core and put cap back on!

Job done!


I've used mine once - about 5 years ago I think. It inflated without a problem and got me to Kwik-Fit fine. The biggest issue I had was getting it out, then getting it back in again.

I've also taken it out and re-fitted it a couple of times since, a proper ball-ache each time. Plus you risk doing your back in 'cos you don't want to lean on the PU nooo

With Chris's tip it should be a breeze next time
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1996 Polar Silver 993 Coupe - AKA 'the money pit'
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wozy
Österreich


Joined: 06 Feb 2013
Posts: 876
Location: Worcestershire


PostPosted: Thu May 17, 2018 9:22 pm    Post subject: Reply with quote

I’m sure I read in Paul Freres excellent book on the history of the 911, that indeed it is a crucial part of the front protection of the 911.

Mind you, possibly I could have dreamt it. Very Happy
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AVI_8
Silverstone


Joined: 19 Jan 2014
Posts: 113
Location: Prestwick


PostPosted: Thu May 17, 2018 9:44 pm    Post subject: Reply with quote

Well whether it’s part of the structural integrity or not one thing I’ve noticed is that my car feels as though it handles better with a full tank of fuel.
I can definitely feel a difference when the tanks running low.
So even for that reason I’m keeping mine in.

A couple of recarro SPG’s is a good way of removing a fair few Kilos Or pole positions if you’re a bit ..... Wider!
 
  
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Tobesetc
Barcelona


Joined: 02 Jun 2014
Posts: 1407
Location: West London, UK


PostPosted: Fri May 18, 2018 11:47 am    Post subject: Reply with quote

Interesting comment that people think it handles better with weight over the front. Can certainly understand the rationale for that.

Mines a C4, but never the less, may give it a go with near-empty tank and no wheel, then fill up and replace wheel.

Interesting!
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 12476
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Fri May 18, 2018 4:22 pm    Post subject: Reply with quote

I'm sure some illuminati members over the cold dark winter months spend the odd day inflating their spare to lubricate the rubber and then watch it go back down folding in to its original size Rolling Eyes

My dough is on jonttt to have tried it a few times Dont know
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motivator
Silverstone


Joined: 06 Jun 2014
Posts: 123
Location: Purley


PostPosted: Fri May 18, 2018 5:38 pm    Post subject: Reply with quote

AndyS wrote:
Some interesting responses on Tobe's link. I particularly like this one from Chris W:

Chris W wrote:
Back on topic, do you all know how to refit the spacesaver in the very small space? Its useful to know!

You take the valve out using the special valve cap. It has a valve core tool on the other end. Take this out completely to allow the tyre to FULLY deflate. Sit on it, hug it, get all the air out you can.

Squeeze the spacesaver back in the hole, without the valve core it will compress.

Once in situ then replace valve core and put cap back on!

Job done!


I've used mine once - about 5 years ago I think. It inflated without a problem and got me to Kwik-Fit fine. The biggest issue I had was getting it out, then getting it back in again.

I've also taken it out and re-fitted it a couple of times since, a proper ball-ache each time. Plus you risk doing your back in 'cos you don't want to lean on the PU nooo

With Chris's tip it should be a breeze next time


OK apart from the lack of space for the inflated and deflated spare, what did you do with the no doubt filthy, full size alloy with wide tyre, does it just squeeze in the frunk or have to go on the rear seats?
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AndyS
Barcelona


Joined: 25 Mar 2010
Posts: 1429
Location: The fast lane


PostPosted: Fri May 18, 2018 8:17 pm    Post subject: Reply with quote

motivator wrote:

OK apart from the lack of space for the inflated and deflated spare, what did you do with the no doubt filthy, full size alloy with wide tyre, does it just squeeze in the frunk or have to go on the rear seats?


It was a front that had a flat, so it fit in frunk (just) once the space saver was out.
If it was a rear, I would have had to get the seat cover out of the tool roll and stick it on the passenger seat.

.....that’s what I had to do with my 996 when I blew a rear - and Mrs S had to get a taxi home Laughing
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tim993
Zolder


Joined: 22 Aug 2006
Posts: 5095
Location: Hampshire


PostPosted: Sat May 19, 2018 6:52 am    Post subject: Reply with quote

I used it once in 2011. It looked unused at that point. It inflated easily and was fine for the 15 miles or so to get to the tyre shop. Once they had replaced the punctured tyre, they deflated the space-saver and replaced it in the frunk. They'd done it several times before so knew exactly what to do. I got the impression they had sucked the air out, rather than remove the valve.🤷‍♂️
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johnty1
Trainee


Joined: 12 May 2016
Posts: 70
Location: Cheshire


PostPosted: Sat May 19, 2018 3:08 pm    Post subject: Reply with quote

AVI_8 wrote:
I would have thought that once inflated it would be difficult to deflate enough to get it to fit in again.


yes, a right pain.

The spare did perform well though, over 100 miles to get home. The worst bit was driving the motorway at 50mph - very scary
 
  
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2553


1999 Porsche 996 Carrera 2

PostPosted: Sat May 19, 2018 4:37 pm    Post subject: Reply with quote

AndyS wrote:
motivator wrote:

OK apart from the lack of space for the inflated and deflated spare, what did you do with the no doubt filthy, full size alloy with wide tyre, does it just squeeze in the frunk or have to go on the rear seats?


It was a front that had a flat, so it fit in frunk (just) once the space saver was out.
If it was a rear, I would have had to get the seat cover out of the tool roll and stick it on the passenger seat.

.....that’s what I had to do with my 996 when I blew a rear - and Mrs S had to get a taxi home Laughing
Thumb


Not as bad as a 350z.

They have a space saver.... But it cannot go on the back. There is a lug that only fits the front.

So if you get a rear puncture, you have to jack the front, swap the spare on, then jack the rear and swap the rear wheel for the front wheel.

Now you have to find somewhere for the rear wheel.... No chance of a passenger! Chuck it in the hedge and come back for it.
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tyinsky
Nürburgring


Joined: 29 Jun 2012
Posts: 426
Location: London, UK

1997 Porsche 993 Carrera 2S

PostPosted: Sun May 20, 2018 6:10 am    Post subject: Reply with quote

Tobesetc wrote:
Good question - mine doesn't ever look to have been inflated. Given that tyres go hard around 5-10 years...what chance a 24 year old deflated unit? Nice hard skinny tyre...mmmm!

It looks temptingly like the right size to store two sleeping bags on my upcoming LM24 trip...

And on the curve-ball subject of crash strength, I'm with the Illuminati...

http://911uk.com/viewtopic.php?t=78799


I used mine last year. I didn’t know how the tyre worked at the time and was amazed at how it inflated. Was on the car for a week while I waited for a tyre and getting it fitted. Delayed fine too and went back in the hole at the front. Really clever bit of design.

You could be right suggesting that the crash rigidity is urban myth, probably not worth finding out though. Maybe leave it out for a track day but the thought of being stranded would put me off. Dont know
 
  
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