There's a new marathon plus in 700x40
http://www.schwalbetires.com/on_tour..._plus_atb.gif#

Or for a smoother ride with less flat protection there's the
http://www.schwalbetires.com/on_tour...thon_slick.jpg

For maximum, there is also this possibility
http://www.schwalbetires.com/on_tour...arathon_xr.gif

So there are 6 marathons. [ maybe they are trying to copy specialized with "armadillo" referring to multiple tires with different characteristics but all build up the common name? ]

marathon
marathon slick
marathon plus
marathon plus ATB
marathon XR
marathon cross

A few months ago they only had 3 marathons. Wait til next year, there may be 12. ;-)

I wish they would do a better job describting the differences. I'm current running a mismatch of marathon on back and marathon slick on front. No compliants so far with a total gross weight of 260. But it's only been about 3 months. I would not recommend such a mismatch. Either go with regular marathons on both or slicks or ?? on both tires. I was going to get the plus but another rider suggested dropping down to the regular marathons for the advantage of the lighter weight and almost the same flat protection. A short while back schwalbe was talking about a new armid belt layer. I don't see on site now. They mentioned the thickness of the tire matched with the kelver belt was designed to absorb, i.e., retain glass fragments, etc. The new was designed to deflect glass, etc. Maybe there were some issues. It was only available in 2 sizes.

I don't know if you need x40 sizes. I'm running x30 on front and x35 on rear. But there is not much weight difference.

Let us know how it works for you.