tyres currently 2 mm, how far to 1.6 mm

[Scraggles]

Went to a local tyre dealer last week, they confirmed the front tyres are 2-3 mm across the tyre on both of them

fleet managers specify some £150 tyre that is not held in stock by any of the branches, so they ordered a pair for me to have swapped over today, or would have been if someone had not rolled one of the tyres out of the door and took it home, like no-one would notice

can anyone give an estimate of how far you can drive before it drops to 1.6 mm ?

had booked in a mobile fitter to change it tuesday, boss is having a hissy fit as would lose a site day and had to postpone it to friday afternoon

looks like a couple of trips of about 250 miles in total

am i worrying too much or is 250 not an issue ?

found myself aquaplaning on the motorway and noticed the tyres were thinner than thought they might

[Plotloss]

Roughly 0.4mm

[Scraggles]

meant distance, not the tread

[K87]

Plotloss said:

Roughly 0.4mm

So you think he can only drive 0.4mm??

Worst attempt at humour ever!



Should be ok for a coupld of hundred more, without any heavy cornering etc.

[chris1roll]

Tyres usually start out at around 7/8 mm, so however far you have driven since they were new divide by the number of mm's you have used gives you your miles per mm
40% of that is roughly what you have left.

Unless you drive like an absolute nutter wheelspinning at every opportunity I wouldn't worry about 250 miles


ETA - Just worked it out, I got about 3,750 miles per mm, on the front of the Octavia, guessing at 8mm starting depth, so 0.4mm would last 1500 miles

(although I think tyres harden as they wear so may be longer, conversely the first few mm may wear away quicker)

Edited by chris1roll on Monday 7th December 21:22

[K87]

How do you get 40%?? If he's around 2.5 mm at the moment that gives him 0.9mm until the limit. 0.9mm of 7mm of wear is more like about 13%

[Scraggles]

ok cheers for the advice, going to be driving carefully and mostly on dual carriageways

[chris1roll]

K87 said:

How do you get 40%?? If he's around 2.5 mm at the moment that gives him 0.9mm until the limit. 0.9mm of 7mm of wear is more like about 13%

2-3 mm he said - work on worst case of 2mm, so he has 0.4 mm left (as another poster pointed out) 0.4 is 40% of 1

40% of the miles per mm left.

Edited by chris1roll on Monday 7th December 21:25

[K87]

chris1roll said:

K87 said:

How do you get 40%?? If he's around 2.5 mm at the moment that gives him 0.9mm until the limit. 0.9mm of 7mm of wear is more like about 13%

2-3 mm he said - work on worst case of 2mm, so he has 0.4 mm left (as another poster pointed out) 0.4 is 40% of 1

40% of the miles per mm left.

Edited by chris1roll on Monday 7th December 21:25

Ahh I see, sorry thought you meant 40% of the overall wear.

[chris1roll]

No worries, typing one - handed with a six month old on the other arm, so posts are rief and perhaps not explained fully!

[ridds]

tbh 2mm in the middle of winter I'd probably splash out and change them.

Summer, fair enough you could get away with it but with the heavy rain recently the last thing I'd want is to hit a large puddle of standing water at high speed on very low tyres.

[Vixpy1]

1K easily

[Scraggles]

hit a sheet of water at high speed and quickly wished that it was about 30 mph slower

suspect someone from a local tyre company is due to get the sack, none of the branches have the special tyre, so swiping one might not be the smartest thing to do, esp as they cost around £150 or so....

if it was my own car it would have been replaced a week or so back...

[mybrainhurts]

Plotloss said:

Roughly 0.4mm

I can confirm that, just checked...

[Beyond Rational]

chris1roll said:

Tyres usually start out at around 7/8 mm, so however far you have driven since they were new divide by the number of mm's you have used gives you your miles per mm
40% of that is roughly what you have left.

Unless you drive like an absolute nutter wheelspinning at every opportunity I wouldn't worry about 250 miles


ETA - Just worked it out, I got about 3,750 miles per mm, on the front of the Octavia, guessing at 8mm starting depth, so 0.4mm would last 1500 miles

(although I think tyres harden as they wear so may be longer, conversely the first few mm may wear away quicker)

Edited by chris1roll on Monday 7th December 21:22

Risky, you're not taking into account surface area, less rubber to wear away at 2mm than 8mm.

[phumy]

You must also take into account the rolling circumference of the tyre which now has a diameter 12mm smaller than when he started, therefore the tyres will be doing more revolutions now (at 2mm tread), at a given speed, than they would have when they were new (at 8mm tread), therefore the wear rate will be faster and the distance shorter.

If you do a graph of wear against distance it will be exponential.

[Scraggles]

will be checking the tires every day and if they seem to drop below the limit, might have to cancel work for the day, but suspect will be ok

[F i F]

Now put him on a conveyor belt...

[GC8]

Theyll last a fair while if the cars geo isnt too far out. Theyll be pretty poor from a safety perspective though: youe better not letting your tyres fall below 3mm of tread, as their wet performance drops of quickly here...

[GKP]

Make sure your tyre pressures are correct too if you're going for max longevity of tread.