How many castors should a chair have for optimal stability?

Optimal stability in a chair is achieved with at least four castors. This design provides a solid base that distributes weight evenly, reducing the risk of tipping and enhancing overall balance, especially in environments where users may move frequently. Chairs with four castors can adjust better to shifts in weight and movement, making them more stable during use. This is particularly important in workplaces, such as clinical laboratories, where staff may be moving between different tasks and need reliable seating that supports active engagement without compromising safety. Additionally, with four castors, the chair offers a greater surface area in contact with the floor, which further aids stability. While two castors might offer some mobility, they lack the balance and support that four provide, which is essential in maintaining safety in a dynamic work environment.