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Subject Topic: Tyres question Post Reply Post New Topic
18/3/2016 at 10:29am
 Location: south cheshire
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Hi, having just bought a new-to-me car with low profile tyres (the first time I have ever had these) can someone tell me:
1. Are the tyre pressures the same for either?
2. Will it make any difference when towing my tiny caravan as opposed to 'normal' tyres?
3. Can I replace them with ordinary tyres at some point? I believe that these low profile tyres wear out quite quickly.

Not sure about the spare, it's full size though.

Sorry for the stupid questions, but this is bugging me! :)


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18/3/2016 at 11:19am
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 Outfit: Swift charisma Skoda Scout 4x4
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When towing put the pressure up to what it says for a fully loaded car, there will be a chart somewhere , inside the filler flap or inside one of the doors, or the car manual.

The only way to change tyre size is to see what sizes are fitted to your car, in the manual, then you will require the appropriate wheels and tyres also, so if you have 18 inch tyres, check to see if 16 inch could be fitted, but you would need to change the wheels to do this, the cheapest option is from a scrap yard, all wheel and tyre sizes will be in the owners manual, if you do decide to change, you will have to remember to slow things down as you wont have the same grip when not towing


18/3/2016 at 11:50am
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All cars these days have what might be called 'low profile tyres' which just means aspect ratio less than 80. They will last as long as any other tyre although it's fair to say tyres seem do less mileage than say, in the 1980s but thats just the grip/wear trade off.

I assume here that car does have standard as supplied wheels/tyres & that aftermarket wheels/tyres have not been fitted? If they have then you need to inform your insurance as premium will be higher. Check standard wheel/tyre sizes in handbook then you will know. Sizes can vary between different trim levels of same car but provided wheels/tyres are standard factory fit then ok.

As pointed out for towing, inflate to 'fully loaded' pressures as indicated on plate in front door jamb or in handbook.


18/3/2016 at 12:13pm
 Location: None Entered
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If the manufacturer fits different sized wheels to the model range, you don't need to inform your insurance, as its the same rule for fitting winter tyres, like if you have standard 18 inch alloys, you can fit 16 inch steel winters on the correct wheels, there will be no actual difference in circumference, only the wall height.


18/3/2016 at 12:32pm
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I said aftermarket wheels & tyres, ie those retro fitted by owner in the belief it makes car look & handle better not those fitted to car from new. Insurers will load premium for aftermarket wheels/tyres as it suggests owner want to drive faster & therefore greater risk.


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18/3/2016 at 1:53pm
 Location: south cheshire
 Outfit: VW Caddy Maxi
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Thanks for your replies. The tyres are indeed the same size as mentioned in the handbook. so must be factory fitted ones. Not sure about the spare, it's the same size though, but might be steel rather than alloy.

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18/3/2016 at 2:29pm
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The main difference you may feel when towing is that the outfit should be a little more stable.

A low-profile tyre has by definition shallower sidewalls which means less sidewall movement. As regards `wearing out faster`, this would only happen if the tyre is of a softer compound (the grippier they are they faster they wear) or you use the extra tread area to drive it like you stole it.

If the car has the original wheels and tyres fitted I would never consider changing to smaller wheels and narrower tyres - with the exception of winter tyres.


18/3/2016 at 10:38pm
 Location: West Yorkshire
 Outfit: Bessacarr Cameo 625 2011
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1)'Same' as what? As mentioned follow the recommendation on the plate on the car - various places,such as a door shut face, glove box, petrol filler door, handbook.

2)Since towing speeds are lower when towing, you probably won't notice any difference.

3)Again, as mentioned you could replace with a different sized rim, but must ensure that the diameter of the wheel/tyre combination remains the same. You must check the handbook tyre fitment for both front and rear axles-don't assume they are the same. Some cars have 'staggered' wheels (the rear wheels/tyres are wider than the fronts and this is not always readily obvious unless you look very carefully) One of our vehicles has rear tyres that are lower profiles at the rear than the front as well as staggered. Don't assume the previous owner got it right either. Finally,some older car factory navigation systems have used the factory circumference of the tyre in the onboard computer system that calculates Distance to go, Time of arrival and so on.

Low profiles deliver better handing due to less flex in the sidewalls, but are less comfortable as a result on our dreadful roads than higher profile tyres.


18/3/2016 at 11:32pm
 Location: Midlands
 Outfit: Mondeo Avondale Gram
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Different tyres may require different pressures to what the handbook states.

Use the handbooks pressures as a starting guide, I use 2 - 4 psi extra depending in the tyre brand and whether its the front or rear.

Khumo on the front then its an extra 4psi to get the correct even tyre wear. If i run the handbook pressure then the shoulders wear slightly faster than the centre.

A bit of trial and error, but the book pressure is a good starting point.





19/3/2016 at 10:28am
 Location: south cheshire
 Outfit: VW Caddy Maxi
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Thanks for the extra info, people. I'm a bit less confused now over this. Having no previous experience of low profile tyres, I just wondered.

I didn't realise that you would need new rims if you wanted to change the tyres to 'ordinary' ones.

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19/3/2016 at 11:05am
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Forget anything you have been told about 'low profile tyres'. Theres no such thing as 'ordinary' tyres now unless you have a car from the 1970s. All cars have low profile tyres nowadays.

You stated your car has the standard sized wheels & tyres that it left the factory with, yes? So it's a non issue, just inflate tyres to 'fully laden' pressures & you are ok to tow.


20/3/2016 at 9:40am
 Location: south cheshire
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Quote: Originally posted by Opensauce on 19/3/2016
Forget anything you have been told about 'low profile tyres'. Theres no such thing as 'ordinary' tyres now unless you have a car from the 1970s. All cars have low profile tyres nowadays.

You stated your car has the standard sized wheels & tyres that it left the factory with, yes? So it's a non issue, just inflate tyres to 'fully laden' pressures & you are ok to tow.



Thanks for the clarification Opensauce!

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20/3/2016 at 11:58am
 Location: West Yorkshire
 Outfit: Bessacarr Cameo 625 2011
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Quote: Originally posted by Opensauce on 19/3/2016Forget anything you have been told about 'low profile tyres'. Theres no such thing as 'ordinary' tyres now unless you have a car from the 1970s. All cars have low profile tyres nowadays.

You stated your car has the standard sized wheels & tyres that it left the factory with, yes? So it's a non issue, just inflate tyres to 'fully laden' pressures & you are ok to tow.



This is a generalisation that is too sweeping to be correct. Low profiles today are generally considered to be those with an aspect ratio of 50-55. As many towcars are 4x4 most of these won't have low profiles for example, except perhaps high end performance models,with larger rims

Remember too, that this is not just a number, but a ratio of sidewall height to tyre width. So a wide tyre will have a deeper sidewall height, than a narrower tyre,for the same aspect ratio value.

Its very important to get things right if your considering changing tyres,as even different tyre brands on the same car are best avoided on 4x4 for example, to reduce the risk of transmission 'wind up'




Post last edited on 20/03/2016 12:38:31



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