It sounds like you've got yourself a full-size spare, which can work fine as a temporary replacement if needed, but there are a couple of things to keep in mind. The wheel and tire you mentioned (1865/60 R15H) are smaller than your current setup (215/45 R17). This difference means the overall diameter and rolling circumference are not the same, which could impact your car's handling and possibly throw off your speedometer slightly when driving on the spare.