Nilfisk BA855ST and BA755ST and ALTO Focus Scrubber Wheel and Tyre
They're 4 and a half inches (112mm) wide, 13 inches in diameter (330mm) It's probably a 6 inch diameter wheel and the tyre probably has a profile of 90mm ( 3 and a half inches)
At the moment, standard postage within Australia is capped at a maximum of $20! Maximise the saving on postage and buy some of the related auto scrubber parts below, such as a replacement scrub brush, some scrubbing pads, some replacement squeegee lips or a clean solution filters or a new floor tool and dustbags for your Nilfisk ALTO or WAP vacuum cleaner!!