Yep, not lighter. You need at least 30-40mm sealant. Not to mention every few months it dries up so you have to add more, you can easily find yourself with 60g in there some dry spread out, some liquid... Pro ones are 235g claimed (I can weigh mine tomorrow) so at best you can be the same as a good tyre with a good tube, not ultra light tube and in the end tube is probably going to be a lighter setup.
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pretty sure mine are exactly on weight.
its not an exact, direct comparison, but given the confidence i have with puncture resistance i dont carry spare tube, pump/co2, etc, when riding my tubeless setting.
so theres bunch more weight saving there - if thats the game we're playing.
ive had a puncture once , on the road. on center tread and it started spraying fluid on and off. it held pressure for me to ride 30km home with quite high pressure. i consider that a success, minus having to clean extra sealant from the downtube and fork bridge. patched it from the inside using a glueless patch (!!!) and its been damn perfect for 500km+ so far.
in addition to 25mm pro one tubeless, i have 25mm one clincher (w/ butyl). mounted on identical rims the P1 come out about 1mm wider. but the feel is completely different. initially the p1 tubeless felt a bit wooden or dead. after a few rides(is it break-in? familarity? purely mental?)... seat of pants evaluation at same pressure is that they feel luxurious by comparison with no sense of bogging. way more comfortable