700x32.
Once it wears through the outercasing it has like 1/8" inch or so of that blue stuff. It seems pretty pliable stuff so once that appears the tire could just tear to little bits and leave me stranded. Problem is where will it show up hmm..

I just realized it is only 800 grams I could stick one in my left bag and just carry a spare tire around. I started carrying around my huge krypto u-lock since people complained about me leaving it at work what is a little tire
I can't wait to see the look on my weekend roadie pals face when he see a spare marathon plus in my bag I don't think they'll ever let me in their rides now