I am about to do 140 km challenge cycling event next Sunday. I have 2 options of wheels. I have Zipp 404 tubular with Conti Gatorskin tubes which are lite weight wheels, great for climbings and quite good in terms of puncture protection vs. Mavic Cosmic SL mounted with Schwalbe Ultremo ZX with latkes tubes which I tend to believe are more tend to get puncture but on the other end you can always fix clinchers on the road. Also they are quite heavier than the Zipp. I guess the options are clear...! The question as well..! What would you do? --- I am here: http://tapatalk.com/map.php?dtjmmt