The FM901 is an ultra high summer performance tire (and an entry-level one at best...), while the 5000 is one of the best ultra high performance *all season* tire we've tested.

All season tires compromise some dry grip and cornering for longer wear, snow light snow capability, and normally &lt;certainly in this case&gt; a smoother and quieter ride.<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR8&amp;url=/tires/index.jsp">Tires</a></li></ul>