when do you replace your worn tyres?

[otolith]

kambites said:

otolith said:

I reckon some people would run their tyres down to the canvas if it were legal.

Some people do despite the fact that it's not!

I'm sure they drive to the conditions, and are in fact perfectly safe driving on canvas

[kambites]

otolith said:

I'm sure they drive to the conditions, and are in fact perfectly safe driving on canvas

Very grippy material, I'm sure.

Do modern tyres actually still contain a canvas layer; presumably these days it's kevlar or something?

[Hilts]

Asssuming you only drive in the dry, wouldn't you get more grip if your tyres were like slicks? ie 0mm

[HustleRussell]

kambites said:

Very grippy material, I'm sure.

Do modern tyres actually still contain a canvas layer; presumably these days it's kevlar or something?

Kevlar and polyester, high load tyres have multiple layers of both. Oh and steel beads.

Hilts said:

Asssuming you only drive in the dry, wouldn't you get more grip if your tyres were like slicks? ie 0mm

Nah it doesn't work that way. Different rubber used for the bits which are supposed to grip.

[Dangerous Dan]

Around 2 - 2.5mm

No point waiting until they are borderline.

[HustleRussell]

...apart from a cost saving of 6-15% on tyres (conservative estimate as tyres wear slower as the tread depth decreases) and many fewer environmentally nasty tyres to dispose of over the years.