The castors in the set are specially designed for Topstar office chairs and do not fit the Swopper Aeris. They are suitable for hard floors such as wood, parquet, tiles or stone and are compatible with certain Topstar models, e.g. "Open Base", "Open Art", "New Workart", "Sitness 50", "Wellpoint SY", "Syncro Net", "Syncro Soft" and "Lady Sitness Deluxe".
Topstar 6990 hard floor castors are generally designed for hard floors such as parquet, tile and stone and can be used as replacement castors for office chairs. However, there is no specific guarantee that they will fit the Topstar Ergo Free Plus office chair directly, without further details of the chair's construction and requirements.
To ensure that these castors are compatible, you should check the following points:
- Pin diameter: approx. 10 mm
- Pin length: approx. 25 mm
- Material and construction of the chair
If these specifications match those of your office chair, the castors should fit.
The pins have a diameter of 1cm. Please note that some office chair castors must have 1.2cm pins.
It would be really good if this information was visible.
I can't tell you, I couldn't use these castors because the bolt diameter didn't fit. Take a castor out of your office chair and measure the bolt with a sliding gauge and then look for suitable castors. Maybe you have to ask the customer service, like I did, what the diameters are.