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Old 28 Nov 2009, 20:59 (Ref:2590942)   #1
HughGJohnson
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Miniature spare tires

Is there a reason for these abominations... other than to save me some trunk space? I had to put one of those on and I made it maybe 10 miles driving very carefully over a snow covered mountain pass. It said not to exceed 55 mph right on the tire and coasting downhill I got up to 45 mph and the spare goes flat. The car felt weird the whole time I had the spare on it and I wouldn't have been comfortable going faster than 45, let alone 55. I understand it's a temporary tire until you can get service, but I still don't understand it. Why not use a real tire?
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Old 28 Nov 2009, 21:29 (Ref:2590952)   #2
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A reply . . .

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Originally Posted by HughGJohnson View Post
Is there a reason for these abominations... other than to save me some trunk space? I had to put one of those on and I made it maybe 10 miles driving very carefully over a snow covered mountain pass. It said not to exceed 55 mph right on the tire and coasting downhill I got up to 45 mph and the spare goes flat. The car felt weird the whole time I had the spare on it and I wouldn't have been comfortable going faster than 45, let alone 55. I understand it's a temporary tire until you can get service, but I still don't understand it. Why not use a real tire?
Your tire probably failed due to underinflation which is why it `felt wierd'. The proper tire pressure is ~65psi. When was the last time you checked it? There should be no reduction in traction or control with a properly inflated `spare' up to the recommended 55mph. Handling will of course be comprimised and the corner with the spare will sit a little lower.

As to their `existence' it is primarily for weight reduction. Cost reduction is another reason. The proliferation of alloy wheels as standard equipment with their wider cross sections require even more expensive tires. I would hope you replaced yours with one from a junkyard. Chances are those have never been on the road.

Our "Government" in it's mandatory Motor Vehicle Safety Standards uses the weight of the vehicle as one determinant of crash survival acceptability. That originally resulted in slightly smaller fuel tanks as less fuel carried also reduced the weight of the vehicle. Gas mileage has increased slightly so the lower fuel capacity has not caused grat `outcry'.

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Old 29 Nov 2009, 01:41 (Ref:2591064)   #3
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Your tire probably failed due to underinflation which is why it `felt wierd'. The proper tire pressure is ~65psi. When was the last time you checked it? There should be no reduction in traction or control with a properly inflated `spare' up to the recommended 55mph. Handling will of course be comprimised and the corner with the spare will sit a little lower.

As to their `existence' it is primarily for weight reduction. Cost reduction is another reason. The proliferation of alloy wheels as standard equipment with their wider cross sections require even more expensive tires. I would hope you replaced yours with one from a junkyard. Chances are those have never been on the road.

Our "Government" in it's mandatory Motor Vehicle Safety Standards uses the weight of the vehicle as one determinant of crash survival acceptability. That originally resulted in slightly smaller fuel tanks as less fuel carried also reduced the weight of the vehicle. Gas mileage has increased slightly so the lower fuel capacity has not caused grat `outcry'.

Thanks for the reply and the information. I should have known money is always the answer. I still have a ten gallon tank, but now I have a normal sized tired in my trunk.
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Old 30 Nov 2009, 05:06 (Ref:2591536)   #4
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The question has been asked (but not answered!) locally as to whether a car fitted with a space-saver spare tire would actually be road legal - due to mis-match in tire size, lack of stability under emergency braking etc.

I've never had an 'official' space saver tire (although have had 'original' size spare with wider road tires) and would not have one due to the speed and range restrictions - what are you supposed to do if you have a flat in the middle of a long trip at night time?
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Old 9 Dec 2009, 14:42 (Ref:2596697)   #5
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NO SPARE TYRE

Probably think I am mad. I owned for several years a Healey 100/4 with a small block chevy fitted, with the boot full of petrol tank. No room for a spare wheel and tyre. Several trips to LeMans etc with a tin in the boot of some rapid fix tyre repair fluid. Fortunately I never got a puncture to find out if his miracle cure would ever work!!!
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Old 9 Dec 2009, 15:52 (Ref:2596730)   #6
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This whole business of the "space saver" spare tyre is, in my opinion, a complete con!

It does not save any space as it sits in the well where a normal spare would fit. It is just a cost cutting exercise on the part of the manufacturers.

I have been trying for some time to find a full size spare for my wife's Jaguar without success. (can get the size but not the style)

Touch wood, we have not had a puncture yet, but I am dreading the day that we will.
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Old 9 Dec 2009, 15:54 (Ref:2596731)   #7
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Originally Posted by markjtaylor View Post
Probably think I am mad. I owned for several years a Healey 100/4 with a small block chevy fitted, with the boot full of petrol tank. No room for a spare wheel and tyre. Several trips to LeMans etc with a tin in the boot of some rapid fix tyre repair fluid. Fortunately I never got a puncture to find out if his miracle cure would ever work!!!
I understand that some cars come with this set up as standard from new.

From proper spare to space saver to a can of majic gunk!!!
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Old 9 Dec 2009, 16:21 (Ref:2596749)   #8
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My daughter has a new Colt CZC steel folding roof convertible coupe, well its a year old now. Anyhow they have taken it one stage further, no spare at all and unbelievable an aerosol can of Tyre sealer fluid and a plug in air inflator in the boot. I suppose on this model there is a little justification as you can only half fill the boot with the roof retracted and there is a little sensor that stops you overfilling it but I dread to think what will happen if she gets a puncture one day as she wont have a clue how to use the thing. Mind you I have a Chevy Blazer and where the spare wheel went is now filled with an Autogas tank, if I go anywhere far I chuck a spare in the back of the SUV apart from that its the RAC!
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Old 9 Dec 2009, 20:36 (Ref:2596894)   #9
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Originally Posted by markjtaylor View Post
Probably think I am mad. I owned for several years a Healey 100/4 with a small block chevy fitted, with the boot full of petrol tank. No room for a spare wheel and tyre. Several trips to LeMans etc with a tin in the boot of some rapid fix tyre repair fluid. Fortunately I never got a puncture to find out if his miracle cure would ever work!!!
It does work, but if you plan on patching the tire, you cannot after using "fix-a-flat". Also, if you ever are forced to use this make sure your tire shop thoroughly cleans the wheel. If they don't you will be chasing a tire imbalance forever.
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Old 10 Dec 2009, 12:52 (Ref:2597260)   #10
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that tyre repair stuff is excellent in my experience - it dealt with an inch square hole in a huge 4x4 tyre many years ago. i've driven on one of the emergency spares as well - in normal weather conditions it just takes a bit of careful driving and being aware that cornering is nigh on impossible. it also managed more than 50 miles and a considerable number of roundabouts and was still almost immaculate when it was replaced.

al, the rac can't supply a new tyre just change the old one, if you don't have a replacement there's nothing they can do. so make sure you've got some of that stuff in the glove compartment
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Old 10 Dec 2009, 19:03 (Ref:2597404)   #11
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The one time i had to use i used it for two or three days going to school and back, the only problem i had with it was it had more tendency to spin on wet roads. the other main problem with it is once you've changed the wheel u then have to try and fit a normal sized wheel in the space where a small one would go.
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Old 12 Dec 2009, 16:29 (Ref:2598542)   #12
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If you have the wife, kids and a boot full of luggage and have a puncture, what do you do with the wheel that comes off of the car. It wont fit in the spare wheel well and there is no room in the car as it is full of kids etc. Are you supposed to leave the wheel at the side of the road?
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Old 12 Dec 2009, 20:28 (Ref:2598637)   #13
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No leave the wife!
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Old 15 Dec 2009, 03:00 (Ref:2599875)   #14
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I know a guy who did a 200 mile trip on one (at least one trip, could have been more!), and would have been travelling at 65mph+. He wouldn't have given a thought as to whether it was a good idea or not, the corner of the car was held off the ground so that is all he would have worried about.
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Old 29 Dec 2009, 22:29 (Ref:2606197)   #15
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Originally Posted by markjtaylor View Post
Probably think I am mad. I owned for several years a Healey 100/4 with a small block chevy fitted, with the boot full of petrol tank. No room for a spare wheel and tyre. Several trips to Le Mans etc with a tin in the boot of some rapid fix tyre repair fluid. Fortunately I never got a puncture to find out if his miracle cure would ever work!!!
I ran a kit car for over 20 years in just the same condition. No trips to Le Mans, though.
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I know a guy who did a 200 mile trip on one (at least one trip, could have been more!), and would have been travelling at 65mph+. He wouldn't have given a thought as to whether it was a good idea or not, the corner of the car was held off the ground so that is all he would have worried about.
I did nearly 200 miles on a space saver tyre at about the same speed. I would have stuck to 50mph, but a race engineer friend said they were good up to 80mph. He drives faster than me on ordinary tyres, so I split the difference.
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