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Again , you're going to have to be patient here, but is the reason for running 29er rims so you can get wider tyres on there? If so, can you still run something like 28mm tyres or does it depend on the individual rim? I've always cycled on 23mm and although I know larger tyre = larger contact patch = lower pressure and more comfort, I'm just a little apprehensive that it won't feel as speedy as my current bikes.
monkeydan-
High pressure tyres give you the illusion that you're going fast due to road vibration, they ironicalLy have more rolling resustance, big tyres at low pressure have very little vibration that make it feel slow, but you're still going as fast as you usually do.
29ers rims are the same as 700c, 28mm will fit, hell I managed 23mm on the Mavic rims, not recommended to due to damaging the rims with pinch flat and increasing the contact point of the tyres too much that it expose the sidewall (some tyres have a remedy for this, such as the Bontrager AW2/3).
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Being shaken around on skinny tyres at high pressures gives some people the sensation that they are going faster. This is an illusion, a slightly wider tyre at lower pressure will roll better and give greater comfort.
There is a point at which larger tyres become significantly heavier. It is about finding the sweetspot (something I have not yet found with my commuto x bike as I also use tyres with puncture protection which affects ride quality, weight and comfort).
edscoble
dancing james
Weight saving are pointless, if you're slow, lose the gut.
The chainset include the two chainring, which you don't need, bear that in mind, the USE chainring is 261g.
If you want a lighter one, get the XM719, you did says it's a commuter, in other word, a hybrid.