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I'd prefer that time riding my bike
Which is what you get when you've had several punctures seal themselves without you having to stop and change or patch a tube.
Not trying to convert you. I just wouldn't go back to tubes unless in an emergency.
Cost wise, it was £15 for a pair of valves which can be reused basically forever, and about the same again for a bottle of sealant which has set up 5 or 6 tyres.There's also environmental impact concerns. I rarely patched tubes which I should have done more of but eventually they go in the bin and I think something like 96% of London's bin waste gets incinerated. Sealant is mostly latex which is biodegradable in UV light and Stans I believe has some sand in it. And plastic bottles are recyclable (if we didn't ship it abroad to be landfilled somewhere else under the label of recycling)
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That's fine but tubes and tyres are consumables, and if you bought your rims in the last few years there's a fair chance they're tubeless compatible.
No one is saying you have to sell all your shit to change over, but it just comes down to what you buy to replace (which at some point you'll need to).
So what's the disadvantage of tubeless for road that's made you decide it's no good without trying it?