I wonder why there is no BitmapSize property on the TMSFMXSpeedButton like that of the TMSFMXButton component.
The TTMSFMXSpeedButton was one of the first TMS Pack for FireMonkey components and is styleable and the bitmap size needs to be set through the style editor. The TTMSFMXButton extends TButton and adds a bitmap and a html text which are not accessible through the style editor, therefore the bitmap size properties are added. We have added this on our todolist for implementation.