Its time to replace the tyres. I've used conti 4 seasons for a few years now as a reasonable compromise between running performance, longevity and puncture resistance. Are there any other models I should be looking at with similar properties ? (puncture resistance being critical here, as local roads get lots of little flints washed onto them). cheers
The tyres I'm replacing are 25mm clinchers (no room in forks for wider, unfortunately).