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Spare tyre anomaly
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FreakyFrenchFan   
Wed Nov 02 2016, 04:31pm
Joined: Feb 08 2015
Member No: #2057
Location: Bicester
 I have what appears to be an unused Michelin Pilot Primacy spare tyre in my boot. On closer inspection I note that it's a 225 and not 245 as all the other tyres on the car are. I suspect this spare is what the car left the factory with as I know the C6 had Michelin Primacys on when they were made. I'm just curious as to its smaller width. Is this the standard size for the spare? Is it a space saving exercise?
onthecut   
Wed Nov 02 2016, 04:58pm
Joined: Sep 20 2016
Member No: #2793
Location: West Mids
 I noticed that on my new toy. Also, a 17" rather than 18" in my case. Mind, it's a tightish fit to extract, so maybe anything bigger just won't go.

Mike.
gmerry   
Wed Nov 02 2016, 05:53pm
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 Hi, 225/55 17" on a steel rim is the standard factory spare for the 2.7s.

A 18" 245/45 18" on an alloy rim will fit in the well for the spare but the boot baseboard, will sit about an inch higher.

regards
G
Dan595   
Thu Nov 03 2016, 05:44pm
Joined: Nov 26 2010
Member No: #299
Location: Wiltshire
 A nice bonus for most 2.2 owners and a rarity these days - the spare is actually the same size as the rest of the tyres.
pattersonoxford   
Sun Nov 06 2016, 10:34pm
Joined: Feb 09 2010
Member No: #48
Location: Oxford
 When the development of the C6 began (1999-2000) it was to have 17" wheels. The body shell was therefore designed with a 17" spare wheel well. By the time the C6 was launched in 2005, wheel fashion dictated an 18" wheel on the V6 cars, but it was too late to change the body shell. Hence four 18" wheels on the corners and one 17" spare in the boot.
gmerry   
Mon Nov 07 2016, 08:12am
Joined: Dec 11 2009
Member No: #21
Location: Scotland
The body shell was therefore designed with a 17" spare wheel well.


The rolling diameter is the same!
furriegurrie   
Mon Nov 07 2016, 08:35am
Joined: Dec 23 2015
Member No: #2448
Location: Roosendaal
 But the width (245 vs 225) is different as you already mentioned earlier. Adapting that would mean altering the body or raising the boot floor. And the boot already isn't that high...
gmerry   
Mon Nov 07 2016, 10:27am
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 The recess under the boot base (spare wheel well) doesn't know or care what size RIM (the spare wheel) is being put there: could be 16", 17", 18" 20". Its irrelevant. So actually, there's no anomaly. No design issue around the imagined change from 17" to 18" that would affect the spare wheel well.

Can't think for a moment what supposed issue this thread is supposed to be addressing!

regards
G
 

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