I've used the goo in an older tube tired bike. Seemed to work OK (no vibes or wobbles) and also protected against nail holes etc. Only downside is that the stuff would pool in the tire if the bike sat for any period of time. Things would be pretty shakey until it re-distributed itself inside the tire. Also, the colder it was, the longer it took for the shakes to go away. Don't think I'd use it again.