i have tried these, combined one one particularly memorable and expensive occasion with open corsa cx seta's. and oh, yeah, gommitalia's. these weighed about 140 grams.
i distincly recall being forced over the most brutally profiled "botts Dots" mid pack and being greeted to the sound and feel of the tires bottoming out 'gainst the rim repeatedly.
they may not increase your avg speed by .4 as much as riding in a skinsuit will...
they also will react to the lube used in pumps and deteriorate from the inside out!
probably no big advantage, but i still may use them again. when it comes to cycling, tell me folly does not rule!
wilmar13 said:If you have [censored] tires that may be true... if you have really nice tires (i.e. supple casings) and you go from standard butyl tube to latex, the difference is quite noticeable. But they are more hassle. I keep seeing claims of less flats, but I have more flats with latex than the thin butyls.