SB8 are VERY fast rolling but thats one of their weaknesses…you arrive at an off-camber, slightly loose corner way too fast, they dont dig in very well under heavy braking & let go suddenly when your already commited in a corner. I still wince at the thought of that day. 🙂
That aside, & if your bimbling along they are ace. I didnt find the walls weak at all, I took the last set down the machX with no issues.
I’ve swapped to the new Ralphs now, initially for the big volume on my rigid SS. I’ll not fit the SB8’s again. They roll almost as quick but grip surprisingly well. (SB8’s 29er versions if anyone is intrested…).
I really liked the XR2’s, but only ran them for a short while. As above for the SB8, they have a quite specific use IMO, mid summer they are great, but they clogged instantly in mud of any sort.
I think other mfrs have caught up & passed the SB8 now. I’m going to say a smaller vol Ralph.