A 50-year-old man who ran a company that sold part-worn tyres as new has been given a nine-month suspended sentence and fined £26,000.
Luke McKenzie of Lower Packington Road, Ashby-de-la-Zouch, Leicestershire was found guilty of 15 counts of possessing and supplying dangerous products.
Lincolnshire Trading Standards raided Moss Tyres on Spring Gardens Industrial Estate in Grantham after a tip-off.
A trading standards officer said the tyres could have put drivers at risk.
Daniel Brown, of Lincolnshire Trading Standards, said: “There were nails and pieces of wood embedded within the tyres … and also damage to the tyre walls which would have compromised the structure of the tyres.”
Andy Wright, principal trading standards officer, said: “This could have had life-threatening consequences for innocent consumers and their families.
“I am extremely concerned by the reckless attitude to customer safety that seems to be shown by McKenzie.”