only cuz the weather is so good at mo.. usually i ride those zaff rigids on front and that white one(a bit like new shelltoes) i bought from you.. yea for a few days to give me a change but there not so good all the time and if wet atall, try them and see.. plenty fast..!no skiding on that rear one tho...conti do a touring 28 that Andy FGL had on the other night that looked like my randonneur but more robust..even if they are cracked they should be fine..i think..