Nearly 100 more people are to lose their jobs at Goodyear in Wolverhampton.
About 2,000 jobs have been lost at the factory in seven years
Goodyear Dunlop said on Tuesday that 84 jobs will be lost at its Stafford Road plant in the city because of a reduction in the number of farm tyres being made.
The Transport and General Workers Union (T&G) said 2,000 workers had been laid off at the site in the past four years, leaving fewer than 600 staff.
Peter Booth, national official of the T&G, said that the remaining workforce were worried about their future job prospects.
"Our members have worked hard and delivered improved productivity and efficiency.
"They are entitled to know what the future plans for the site are, so we are
demanding a meeting with the company.
"After all the bad news at this plant, the workforce will need to be assured
that the business plan will secure the Wolverhampton site."
More than 400 people were laid off last year when 70 years of car tyre production in the city came to an end.