Looking at Hemmi's picture I take it that he has a full size spare.
I have a similar spare rim, but recently discovered that the tyre on it is not the same size as the other Khumo Solus tyres sold as standard. Whereas they are 195/65R15 the spare is a 185/65R15!!
I enquired with my Hyundai service agent about it, having thought they'd made a mistake, and requested a replacement. My service manager made some enquiries and got back to me, stating that apparently all of the spare tyres fitted to the steel rims are narrower so that they fit in the under-floor boot space. He said that's why they have a 80km/hr sticker on them.
It all sounds a bit dodgy to me, especially since one of my alloy wheels with the 195's fits into the space just fine. I'm getting the 185 spare replaced with a 195 in any case.
I'd be interested to know whether any others have encountered this issue.