Guessing 460 / 70 r24 , about 500 a pop
Buy this and cut some more tread in them. Or at least you could find how much rubber until you hit the cords.
Tyre Cutter regroover HGV tread recutting regrooving tool. Warranty & FREE POST | eBay
“ Tyre Cutter regroover HGV tread recutting regrooving tool. Ideal for HGV, Forklift or Race Slicks. Tyre Cutter. the one in pic is 240v. (The Rescut Mk3 will also run from a small inverter & 12v car battery has it's power consumption is only100 watts).www.ebay.co.uk
Maybe a bit more. but under 4K fitted surely?Guessing 460 / 70 r24 , about 500 a pop