Originally Posted by
bruce19
This is my experience.....I have Mavic Ksyrium Elite USTs w/Mavic Yksion tires. They were developed as a "system" by Mavic. You can inflate with a regular floor pump. I'm in my 3rd season (I have them on my GFs bike too) and neither of us has had a flat. They are lighter than my Ksyrium Elite clinchers. They seem to roll more easily and they are definitely more comfortable. I haven't encountered any down side yet.
We have 3 of our mountain bikes in our stable that use the UST system and I have to agree that it works great. Problem is that the tires no longer seem to be made, and that early standard has been abandoned.