Def NOT hardcore....as I say, its bridleways, footpaths and tracks. I am using Alex S500's at the moment, and they are standing up to whatever abuse I am throwing at them, it was the lack of spokes on the R501's that bothered me. I have used them previously on road, and was pleased with them then, but wasnt sure they were up to the extra stesses involved. ATEOTD, £70's a bargain, so I may well give them a go anyway. As for the 5mm differ between MTB and road frames, I usually add or remove spacers accordingly. Its never been an issue.