I've run both..
Tubed
+ simple, reliable. .. can be made to work with a large hole in the tyre, or a cracked rim ... or both.
- Time taken to fix. Your on tour .. time is not an issue. Relax. Have a tea. It is a bit much in the hot sun though.
Tubeless
+ easy and quick to fix a normal flat.
- Must have tubeless type tyres.
- Difficult to change tyres
- Must have back up tube for emergencies (rim dent, tyre rip etc)
- if you run too low a pressure the tyre can burp and loose even more pressure.
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Rate of flats .. I suspect the tyre has a large part to play here .. tubeless tyres are usually heavier and thicker than the tube type tyres .. and thus get less flats just from their increased thickness and density. If you want to compare then run the same tyres with the same bikes riders etc .. one with a tube the other without and see.
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Tube type rims ....Yes the 'newer' type rims have a significant lip .. older rims don't have it and are much easier to change. The newer ones are supposed to be better if you have a blow out. Your choice - keep the supposed increase in safety .. or remove some of the lip to make it easier to get the tube out. I remove about 200mm length of one the lips opposite the valve.
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