Technical Tyre Question

What is the Marker circled in red, it is the first time I have spotted that one and presuming the bumps circled in yellow are the depth wear markers. 

The tyres do have 5.5 to 6.0mm of tread left on them.

Is it not a wear bar?

www.tiresplus.com/blog/tires/what-are-wear-bars/

The one circled in red would leave about 4mm of thread depth. Could it be an 'Off Road' tread wear indicator? Obviously for off road use you don't really want to get down to 1.6mm. So do AT tyres have two wear marker indicators, one for minimum road legal limit and one for minimum off road grip/performance?

Definitely a tread wear bar, never seen one set at 4mm before, but never had proper AT tyres. Maybe Google the tyre & see what the manufacturer says,

wrote:

do AT tyres have two wear marker indicators, one for minimum road legal limit and one for minimum off road grip/performance?

This has been, so to speak, my experience and my assumption.

Over a couple of decades and a half dozen or so different brands of AT tires, I've noticed what appears to be two sets of wear bars, and I've assumed, that the taller one is for off road usage.

If you look on the side wall a small triangle with twi printed under it
Tread wear indicator 

Never seen the other indicator circled in red 
When my tyres get to around 8mm they get changed 
Only really used off road 

wrote:

Definitely a tread wear bar, never seen one set at 4mm before, but never had proper AT tyres. Maybe Google the tyre & see what the manufacturer says,

Yeah thanks, tried that, but all it came up with was your normal side wall markings.

 

wrote:

If you look on the side wall a small triangle with twi printed under it
Tread wear indicator 

Never seen the other indicator circled in red 
When my tyres get to around 8mm they get changed 
Only really used off road 

Thanks, I'll have a look tomorrow.

My standard Dueler tyres have these and they indicate 3mm tread left so I assume that is a common sense ( change me if you know what's good for you) as against the legal limit marker ( change me you idiot ) of 1.6mm.

Roger

Here in Norway the limit for tyres during winter is 3mm.
I f this tyre is also sold here with an three peak snow flake marking, then that might be an explanation.

Should be min. 3mm all year in my opinion so Rogers interpretations are good guidelines.