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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.
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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).
If you insist on running light tyres and tubes then definitely latex is better than lightweight butyl. In terms of tyres, Gators are designed to be durable not so light and it depends on what size you want to run. You can run 20s which are super light but they're shit. Obviously you'll add grams as the size increases but the ride will be better, grip better, etc. Everything is a compromise.