According to the manufacturer, "universal castors suitable for hard and carpeted floors" are mounted on the chair.

Technically there doesn't seem to be any difference here, they are also both models with armrests. However, the other linked offer comes from a dealer partner who sells through our shop. It therefore appears that one of them is an import. So in this case, you can definitely go by the price. And this model here is currently very cheap.

I am 192cm tall and the chair fits me perfectly.

In this case, please contact our customer service directly at https://helpcenter.galaxus.ch/hc/de/requests/new :) Our team will be happy to clarify this.

We do not currently have the optional lumbar supports from Giroflex in our range. You are welcome to contact our customer service directly (digitec@digitec.ch), then this can be checked individually with the supplier.

Not sure if this is what you want to know but from the floor to above the armrest is 62 cm when the chair and the backs are at the bottom. You can raise the backrest 10 cm to 72 cm. The chair can be 11 cm high and then the distance from the floor to the armrest is 73-83 cm.

ask the customer service

The backrest and the seat move synchronously when the backrest lock is switched off. This ensures ergonomically better sitting. When the backrest moves backwards, the seat surface at the back also lowers slightly at the same time.