If you don't mind me asking, which tubes are you using and how much psi do you normally run? Thanks.travis200 said:I run them in my CX bike. The only real disadvatage is the weight. The advantage in 18 races not 1 flat. I did hear a flat starting and lost a little air but the sealant did it's job. I think the sealant can harden over time and clog up the valve stem but I haven't had any issues yet.