Tyre depths

I've just changed our Audi Q3's tyres at a little bit over 2mm at 32K miles

1.7 

Absolute min 3mm.

From ROSPA:

Stopping distances start to increase dramatically at tread depths of below 3mm. At the legal minimum tread depth of 1.6mm, the stopping distance is increased by 36.8% on the hot rolled asphalt and
44.6% on the smooth concrete.

OR 5 years old regardless of how deep the tread is.

Minimum legal is 1.6mm I would not wish to go down any where near that. My tow car is used almost exclusively when on holiday. I check pressure just before each of 3 tours and one closer 2 week stay. I suppose that on a tour the tow car could easily do 2k miles. If the front tyres were anywhere near 3mm at that time I would change them. The rear tyres and those on our local runabout tyres are changed on age rather than wear.

I always change at around 3 mm but with premium tyres could you go closer to the 1.6

many tyre places inc Costco will  only fit new tyres to the rear & assuming they're same size, swap the old rears to the front. 

I've  just  had  my  'van  M O T 'd  &  serviced  With  a  full  set  of  five  new  boots  on  .  12  Reg  van  28K  on  the  clock  &  the  tyres  definitely  shewing  signs  of  incipient  cracks.  Much  better  scrapping  the  tyres  than  scrapping  me  !!

I think most will. My local tyre fitter would certainly do so without charge. I really don't worry about it. 

Totally agree - I've just put a set of BFG's on my Touareg after 26k miles when the originals were down to 3 to 4 mm.  Just not worth taking a risk and although an expensive exercise, it's something you have to be aware of when towing with a big heavy 4x4 which tends to eat tyres anyway. At least the Goodrichs should give me much better mileage.

Really got no idea. National tyres go round all the company cars in the works car park every couple of months and check all the tyres and replace when required.

All I know about it is when I get a call from reception to give them the keys while the work is done.

Just had a quote from the mobile caravan engineer i use to replace the caravan tyres now they are 8 years old. £130 the pair, fitted.