Their exact wording on the web page is:
Have any of you hired a bike with this shop, and if so, did you actually have to leave your passport with them? I have serious qualms about leaving my passport with any vendor while overseas, so I'm not too happy about this condition.ORIGINAL PHOTOGRAPHIC ID SUCH AS A PASSPORT OR DRIVING LICENCE MUST BE LEFT FOR THE DURATION OF THE HIRE
Regards,
--- Victor.