Join Date: Nov 2004
Location: Portland, OR
Bikes: 07 Fisher Paragon, 00' Lemond Buenos Aries, Specialized Langster, Schwinn World Sport SS townie, 99 SS-Works single speed conversion, early 90s Raleigh roadie rain bike, 07 Fisher Rig, Trek 520, and a home-modified chopper
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I went tubeless because I go sick of getting flats. Living in Phx at the time, I was getting a flat about one out of every 3 rides. The tubeless fixed that. No pinch flats and, with a tire sealant, no punctures.
It's not always lighter. The major advantage is tire pressure. You can run a good 10-15 psi less with tubeless (down around 30 psi or less even for 200lb rider) than with tubes because there are no pinch flats. You can use your rims with a Stans NoTubes kit.
I converted my singlespeed wheels and have not had any problems. I have CrossMax tubeless on another bike with no problems either. You don't need the CrossMax. While the wheels are great, they're pricey. If i had to do it again I'd probably use the Mavic UST rim and pick a hubset I liked. Even a Chris King set up would be cheaper than CrossMax (at least the SLs).
Bottomline, tubeless are great. I won't go back to tubes. They can be hard to seat the first time, but it's worth it. No flats since I've converted (over a year ago, but only really rode for the first 6 months of it). With the Stans conversion you can run any rim and tire you want, but I recommend a UST tire because they have stronger sidewalls. Even if you go the full UST rim and tire route I'd still recommend Stans. It's a great tire sealant.