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48/32 is a decent range, I'm keeping it for now, as the 32/34 combo may prove useful off road.
2.3 is just about too much as tyres flex likely to rub on the chainstay, luckily there's a G-One Speed in 2.0 instead which will be a lots better.
Felt like a road-going version of a fat bike, G-One Speed is awesome, so much nicer on the road than the standard G-One, haven't tried it off road yet.
seatpost is fine, it's standard own brand one, gonna source a 46cm Cowbell handlebar.
2.3 tyres (650b 60mm) is just about the max on the rear of this Arkose.