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Home > General > Different sized tyres on the same axle |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4946 |
If you have a front tyre puncture on a FWD car is it best to put the space saver on the rear and move a rear tyre to the front ? (assuming front and rear are the same).
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24th Mar 2022 8:15 pm |
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Simon J Member Since: 27 Jul 2019 Location: Norn Iron Posts: 703 |
I had to do that as the space saver wheel wouldn’t clear the larger front brakes on the Volvo but it would seem to make sense to do that in any case, especially if the radius/diameter of the space saver was significantly different to that of the standard tyre. This is quite a useful site for comparing different tyre sizes - https://tiresize.com/comparison/ |
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24th Mar 2022 8:20 pm |
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Andy131 Member Since: 09 Dec 2009 Location: Manchester Posts: 2175 |
I usually get punctures in the rear - objects thrown up by front tyre?
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24th Mar 2022 9:45 pm |
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Simon J Member Since: 27 Jul 2019 Location: Norn Iron Posts: 703 |
The space saver tyre supplied with a vehicle is rated at at least half the maximum axle loads of the vehicle. The standard skinny Pirelli 18” tyre has a 104 load rating, i.e. 900 kgs. So perfectly adequate to keep on the rear while towing. They really are very cunningly designed items. |
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24th Mar 2022 9:51 pm |
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ozjeff62 Member Since: 28 May 2018 Location: Sydney, NSW Posts: 494 |
"temporary" In another part of the legislation/regulation will be an appendix or glossary containing the legal definition of words used within the rest of the text. So in those regs which you have quoted the word "temporary" will be used without explanation - the definition will be in yet another place. Failing that, if it has not been defined, it will be up to case law and subsequent precedent for courts to determine what "temporary" means. In this case you have to search case law for judgements. That's why we employ lawyers, barristers, clerks, magistrates and such. It becomes too complex for lay people - unless you have a lot of time, and a lot of resources. So in this case, we are probably wasting our time. It's on the side of the tyre, in the manual, on the tyre placard. The manufacturer didn't put it there just for a laugh. The clue lies in the MOT fail. As a copper I was able to defect cars. Some defects could put a car off the road instantly, some would not. Some would have a longer period or a different process for allowing the car to be driven on the road again. Some things that are a MOT fail do not make it illegal to use the motor vehicle for a particular use. Such as driving it to a MOT inspection. Did you see Edd China driving that terrible Range Rover to the MOT station? They actually refused to inspect it as it was such a piece of dangerous rubbish. But on the trip to the MOT station, and on the way to the place of repair, it was legally driven although it was indeed legally unroadworthy. I've done the same. MY11 SD4 SE Auto |
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27th Mar 2022 11:00 am |
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Jagracer Member Since: 22 Feb 2019 Location: east anglia Posts: 182 |
Why not save the hassle and fit a full size spare, carried in the boot. My FL2 has a Labelon the spare as if it is a spacesaver, but it is a steel wheel with a 225/65r17 Hancook correct load rated tyre. So why a label? Just swap for an alloy with a 235/65R17 tyre, job done. If you have a different size, then have five wheels all the same. Make sure the spare is not directional. |
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27th Mar 2022 2:29 pm |
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2071 |
When I had an MG ZS180, the space saver wouldn't fit over the front brakes, so a puncture on the front meant fitting the space saver to the rear, the good rear tyre was then fitted to the front. This issue was unique to the ZS180, as the lower powered ZS models had smaller front brakes, so the space saver fitted just fine on the front. In reality, providing the spare fits the brakes, I can't see where it fits is much of an issue, although with a really skinny spare, braking heavily will be effected. Hyundai Ioniq 5 Ultimate. The family car. 2009 Rimini Red SE TD4. Gone. 2006 Tonga Green i6 HSE. Gone. Audi A5 convertible, my daily driver. 1972 Hillman Avenger GT, the project. |
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27th Mar 2022 2:36 pm |
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Simon J Member Since: 27 Jul 2019 Location: Norn Iron Posts: 703 |
The lower speed rating of the Hankook tyre - H vs V - would presumably fall foul of Regulation 27 (1) (a) of the C&U Regs 1986 which relates to the suitability of a tyre having regard to the tyres on the other wheels. But the lower speed rating would also mean that the tyre is classified as a temporary use spare tyre - see Regulation 3 - Interpretation - of the C&U Regs - and thus Regulation 27 (1) (a) would not apply provided the vehicle was driven at a speed of less than 50 mph by virtue of Regulation 27 (3). Hence the 50 mph sticker. There’s no such thing as a 'space saver' as far as the Regulations are concerned - it’s whether or not the tyre is classified as a 'temporary use spare tyre' that determines the need for the sticker. But I’d agree - if space permits, get hold of a matching wheel and tyre. But if space doesn’t permit, the space saver temporary use spare tyre is a good alternative. And there is no definition of 'temporary' in the Interpretation Regulation I refer to above, just a definition of 'temporary use spare tyre' with no mention of what is meant, if anything, by temporary. So it’s really hard to see what offence you could be committing by using a 'temporary use spare tyre' other than if the tread were to be worn below the legal minimum of 1.6mm. |
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27th Mar 2022 10:17 pm |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4946 |
My old BMW had 245 wide tyres on the front and 265 on the rear. The BMW supplied space saver was 125 wide - I drove very carefully when I had cause to use it. Jules |
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27th Mar 2022 10:52 pm |
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Andy131 Member Since: 09 Dec 2009 Location: Manchester Posts: 2175 |
Just a note - full sized steel wheels still have a 50mph Limit - WHY, because the wheel bolt shoulders are profiled for alloy wheels. If you wanted to go faster with the steel wheel you would need to carry a set of wheel bolts that are correct for steel wheels.
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27th Mar 2022 10:56 pm |
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Lightwater Member Since: 21 Aug 2014 Location: Sydney Northern Beaches Posts: 4905 |
In outback Australia I plug the tyre myself like everyone else, also have TPMS to catch the leak before the tyre is destroyed. No road service out there. Procrastination, mankind's greatest labour saving device!
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27th Mar 2022 11:04 pm |
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MotionInc Member Since: 17 Jun 2019 Location: North America Posts: 1343 |
Excellent point! |
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27th Mar 2022 11:05 pm |
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Simon J Member Since: 27 Jul 2019 Location: Norn Iron Posts: 703 |
If the steel wheel carries a temporary use spare tyre, e.g. the Hankook 225/65 R17, then you are still limited to 50 mph regardless of what wheel nuts you use. |
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28th Mar 2022 5:41 am |
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Jagracer Member Since: 22 Feb 2019 Location: east anglia Posts: 182 |
I have never met a member of Plod who has ever furthered his pension by pullin someone for spare tyres other than the canvas showing, which used to be legal once. Its worth noting that some FL2 wheel sizes will take a Commercial tyre on the spare, correct speed and load. It is common to the Ford Courier van. |
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29th Mar 2022 10:31 am |
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