I have a carbon Trek Farley. Putting 100mm Mastodon on it really made the bike much more versatile, a go anywhere trail bike, and with. the 29x3.0 wheels it rips. If I only rode it in snow or beach or gravel, rigid would be fine. But I like that I can head off piste and deal with anything I encounter. I also like riding it when I go out with buddies on faster trail bikes that may be slower riders.