Watling Tyres employee Matthew Hoare was repairing a puncture on a loading shovel's tyre when the accident happened.
The Health and Safety Executive's (HSE) investigation found that Hoare was working alone and using equipment that had not been properly maintained. He was not trained or competent to carry out the task.
After already pleading guilty to breaching Section 2(1) and Section 3(1) of the Health and Safety at Work Act at a hearing on 29 January, Watling Tyres was yesterday fined and ordered to pay costs of £99,485.