I have 47 section CST "City" tyres on my Furo folder and they have proved fine on semi paved and washed out old railway cycle trails in County Durham last week. I haven't tried them in mud. On the road - hmm, they have a max of 45 psi and are quite "bouncy" and the tread is noisy and feels "squirrely". I have been looking for an alternative which will take higher pressures and have bookmarked Marathon's (though 20% heavier will take higher pressures (70psi) and probably a better tread for the road, can be medium priced) or Maxxis Torch or DTH which are both sub 400g. The difference between the 2 is degree of puncture protection. High price and thinner tread so likely less longevity, but can go to 110 psi. However I have to grind the tread off the stock tyres before I can justify £60 on a pair.