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Latex inner tubes are more durable than butyl: being more pliable, they're more likely to stretch around anything piercing the tyre.
I picked up a thorn that was a good couple of mm through the tyre and I only stopped to find out what the thunk-thunk-thunk noise was.
Which is why lightweight butyl tubes is such a daft idea: making them lighter makes them even less puncture proof, which is hardly what you want on your daily bike (which is the only instance butyl makes sense, due to not having to pump them up every couple of days).
I'm not insisting on anything really, just wanting to hear opinions of those more in the know than me. Maybe when I come to building it I'll have a play around with what suits me and my riding.
Lighter tyres/more durable tubes - or - Durable tyres/lighter tubes
I think the gators I have at the moment are 25s or 23s, which are probably the widths I'd be happiest using.
If the final build is a little over 7kg but durable then I'll be happy.