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It really depends on what kind of cycling you do, honestly. Tubeless is great if you're riding in the mountains or on rough terrain because yeah, fewer flats and better traction, but it comes with its complications: you need compatible rims and tires, sealant that needs changing every so often, and if your tire gets badly damaged it's not as easy to fix on the road. For city cycling or road riding where the terrain is more predictable, tubes are still practical, cheap, and way simpler to repair anywhere. It's not like everyone's switching to tubeless; really, people just pick based on how they use their bike.
Most people go for tubeless now! Fewer punctures, better grip, and even though it costs a bit more upfront, people really value not getting stranded halfway through a ride.
It's not like people choose one or the other without hesitation, because the reality is that tubeless still remains relatively inconvenient to maintain if you don't have easy access to an air pump or spare sealant on the road. A lot of people still stick with traditional tubes precisely because it's more predictable: fewer flats with tubeless, sure, but when something does happen it's easier to fix in the middle of nowhere with what you're carrying. So the choice really comes down to what kind of trip you're planning and how willing you are to carry extra tools.
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