These wheels and tyres are for sale on Ebay.
So, I contact the seller asking how many millimetres of tread the rear tyres have got on them. His answer is "I'm not sure, how about I send you a photo?"
I say a photo is not much use, I'd rather he just measure them and tell me. After all, it's not difficult, and I like to know what it is I'm thinking of buying.
His reply is "They've got a fair bit of tread. Measuring them isn't easy if you have got the tool to do it".
WTF is wrong with people?!