Tyre tred

Takmon

red_eye said:

red_eye said:

Takmon said:

red_eye said:

New tyres are 8mm. Also make sure your not measuring on the wear indicator as that would take around 2mm off.
the front tyres have to deal with acceleration, braking and cornering forces. Obviously driving like you stole it will eat tyres 

the secret to getting the most out of your Tyres is to have new tyres on the rear and the tears moved to the front. On fwd  front tyres wear quicker then the rears this leaves the rear tyres to degrade over time. I seen tyres with 6mm all cracked up

Incorrect, if you actually measure a new tyre you will find they do vary and won't necessarily be 8mm.

There 8mm for all season, 9 for some winters and up to 10 for off road

Obviously there will minor differences if your using engineering measuring devices, but if your using a normal tread depth gauge you’ll find it pretty much 8mm. No point getting a three decimal place resolution for tyres

Like I said above I have measured new tyres and they were 6.75mm which is certainly nowhere near 8mm. There is no standard and if you don't believe me then here is a link from Michelin themselves that says their tyres range from 7 to 9mm depending on the model so that proves your 8mm rule wrong right away:

https://www.michelin.co.uk/auto/tips-and-advice/advice-auto/discover-the-suv/suv-frequently-asked-questions/what-is-the-legal-limit-for-suv-tyres

red_eye

Takmon said:

red_eye said:

red_eye said:

Takmon said:

Like I said above I have measured new tyres and they were 6.75mm which is certainly nowhere near 8mm. There is no standard and if you don't believe me then here is a link from Michelin themselves that says their tyres range from 7 to 9mm depending on the model so that proves your 8mm rule wrong right away:

https://www.michelin.co.uk/auto/tips-and-advice/advice-auto/discover-the-suv/suv-frequently-asked-questions/what-is-the-legal-limit-for-suv-tyres

Like I said there’s no need to go in to the tenths or hundreds of a mm for a tyre. I have no resolution info for depth measurements doing a quick google so the legal limit is 1.6mm 
So my tyres are 1.562mm your honor won’t get you off points and a fine it’s still 1.5mm
https://www.toolstation.com/draper-tyre-tread-depth-gauge/p15731?store=D4&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=EAIaIQobChMI_9mXzZzy5wIVAkPTCh1E7garEAQYAiABEgKn5PD_BwE Is all you need to measure tyres

AdrianC

red_eye said:

There 8mm for all season, 9 for some winters and up to 10 for off road

If you're going to wave such wild generalisations around without the slightest hint of a source, at least include the 80-90% of new tyres sold which are summer tyres...

red_eye

My source is
https://www.toolstation.com/draper-tyre-tread-depth-gauge/p15731?store=D4&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=EAIaIQobChMI_9mXzZzy5wIVAkPTCh1E7garEAQYAiABEgKn5PD_BwE And nearly 10 years having to fit tyres as part of my job

Takmon

red_eye said:

Takmon said:

red_eye said:

red_eye said:

Takmon said:

Like I said above I have measured new tyres and they were 6.75mm which is certainly nowhere near 8mm. There is no standard and if you don't believe me then here is a link from Michelin themselves that says their tyres range from 7 to 9mm depending on the model so that proves your 8mm rule wrong right away:

https://www.michelin.co.uk/auto/tips-and-advice/advice-auto/discover-the-suv/suv-frequently-asked-questions/what-is-the-legal-limit-for-suv-tyres

Like I said there’s no need to go in to the tenths or hundreds of a mm for a tyre. I have no resolution info for depth measurements doing a quick google so the legal limit is 1.6mm 
So my tyres are 1.562mm your honor won’t get you off points and a fine it’s still 1.5mm
https://www.toolstation.com/draper-tyre-tread-depth-gauge/p15731?store=D4&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=EAIaIQobChMI_9mXzZzy5wIVAkPTCh1E7garEAQYAiABEgKn5PD_BwE Is all you need to measure tyres

I don't think you are reading what i'm saying... You said that tyres are 8mm from new i have just proven to you that some tyres are 7mm from new which means you are wrong. In my example my tyres were supposed to be 7mm from new but they actually measured 6.75mm so that's quite a bit under.
Which brings me back to my original point that you can't assume a new tyre is 8mm. 

red_eye

your not getting what I’m saying.
it doesn’t matter if there 8mm 7mm 6mm there’s so many variables that contribute to tyre wear that it is pointless worrying about .00 of a mm outside of Motorsport. The hint was the link I posted of the cheapest type of gauge available not including the wear indicator.

Takmon

red_eye said:

your not getting what I’m saying.
it doesn’t matter if there 8mm 7mm 6mm there’s so many variables that contribute to tyre wear that it is pointless worrying about .00 of a mm outside of Motorsport. The hint was the link I posted of the cheapest type of gauge available not including the wear indicator.

In your first post on this thread you said "New tyres are 8mm" then in your next post you said "There 8mm for all season, 9 for some winters and up to 10 for off road"

So considering that different tyre manufacturers have different tread depths when new (like michelin have some tyres that start at 7mm) then you are wrong when you said both those phrases as if they are standard depths. 

I never mentioned measuring tyres to the nearest micron i'm just saying all tyres manufactures have different specifications so you can't assume it will be 8mm from new like you and the OP have. 

red_eye

Takmon said:

red_eye said:

your not getting what I’m saying.
it doesn’t matter if there 8mm 7mm 6mm there’s so many variables that contribute to tyre wear that it is pointless worrying about .00 of a mm outside of Motorsport. The hint was the link I posted of the cheapest type of gauge available not including the wear indicator.

In your first post on this thread you said "New tyres are 8mm" then in your next post you said "There 8mm for all season, 9 for some winters and up to 10 for off road"

So considering that different tyre manufacturers have different tread depths when new (like michelin have some tyres that start at 7mm) then you are wrong when you said both those phrases as if they are standard depths. 

I never mentioned measuring tyres to the nearest micron i'm just saying all tyres manufactures have different specifications so you can't assume it will be 8mm from new like you and the OP have. 

Use the gauge I linked to you round up or down to the nearest. Arguing over a pointless .00mm when it doesn’t matter because of variables that you cannot control is not helping the op.

daveyjp

daveyjp said:

How do you know they were 8mm when new?  

We have had two new Dunlop tyres recently due to punctures and they were barely 7mm.  I measured because I wondered if 8mm was accurate.  

Confirmed following a service last week.

N/S Front TyreOuter: 7.0mm Middle: 7.0mm Inner: 7.0mm Dunlop 175/65/15 84 H

Biggus_Dickus

[Deleted User] said:

Biggus_Dickus said:

sophlouwhit said:

In October we got 2 new front tyres.

We just had a service done and they claim the tred is now 6mm, 4 months in 2mm down? Im not 100% sure but do think this sudden 8-6mm tred drop has happened before..? Are they over wearing? If not then why do 8-6mm drop happen so fast over 6-2mm?

I also noticed with these new tires we have had done they have put the tred down as 6mm? not sure why this is considering they are brand new?

Too add again, our drive is at a corner so you have to turn a full 180 from the small side road to mount up it, kerb is dipped etc, but drivers side always mounts the drive before the passanger side.. will this cause excess wear or am i over thinking? obviously this is usually done at a pretty slow speed.

Also, how many miles can i expect out of each set of tyres? i know it generally depends but typically what is under performing?

The answer to your question depends entirely on your journey profile and your style of driving.

The rate that tyre tread wears down isn’t linear; i.e. the first ‘‘mm’’ of tread will wear down quicker than the second ‘‘mm’’,...the second ‘mm’ will wear down quicker than the third ‘mm’,... and so on.

Are you sure about that? Isn't it the reverse?

After the first mm, the rolling circumference of the tyre is smaller, so the wheel has to turn more often to cover the same distance, and so the second mm will wear more quickly than the first. Albeit only by a fraction of a percentage.

No, it isn’t the reverse seemingly,...although it does seems to be a bit of an anomaly;

...notwithstanding the miniscule effect of a tyre losing a small amount of overall diameter as it wears, the deeper the tread the more it is subjected to friction/abrasion/deformation as it interacts with the surface of the road during braking, acceleration or cornering etc.

The deformation and subsequent wearing of the tyre surface decreases as the tread depth decreases. I’ve seen studies over the years and the tyre tread depth wear (for the same mileage) can be significantly higher for a new tyre than when the tyre is well worn. From memory something like 20% difference for an average car tyre.

I think the moral of the story was don’t abuse your new tyres or they’ll wear down quicker than you’d like.

However, as always, much depends on the type of car and how/where it is driven,...and how aggressively.