hehe...they have around 70-75% tread left (approx 10 mm) they are firestone tyres and they are on nissan alloys (well 4 of them are and 1 of them is not on a rim).
I must tell you tho, 1 tyre has managed to get a very fine cut in it, isnt affecting the tyre at all and I am still driving with it, but if you were worried you could use that 1 as the spare.
the current spare is a Khumo with simular tread pattern and depth. I had a wheel alignment done and the guys diddnt think it was a prob at firestone but just wanna be strait up.
So dont miss out on this great opportunity to get yourself onto this fine rubber
http://www.trademe.co.nz/Browse/Listing ... =216499209 this is the link to the trademe auction
Good luck!