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@edscoble
My old Genesis without rack (mudguard and brooks though) is 11kg, my Oak is 12kg including rack and dynamo.
Wide rims can allow you to run a lower pressure, as well as reduced tyres squirming a lots if set the same pressure as you have now, only noticeable if the rims is really wide, like 21-22mm internal (like the ZTR).
They're perfect with 28mm which look closer to a 23mm on 23mm rims.
Any bigger it's hard to tell. I can't tell much difference with a 42mm tyres on a 17mm and 20mm internal, the width haven't changed.