not gonna fork out unnessecerily for a single new thick rubber which will upset the balanced tread depth across the 4 wheels and make the steering drift over more.
plenty of life left at 4mm.
8mm new, 1.5mm min, 6.5mm useable tread available so the tyres only down to 38%.
according to my tyre records I estimate theres bout 5k miles left
when the front right punctured tyre wears down enough, I may be able to fit a spare rotas from the trackday set of wheels with no puncture.
once I've got my moneys worth from these, then I'll change to 595rs-r