I have wondered this as well, when trying to compute an optimal cassette for my bicycle. I don't think it's possible to get truly even spacing using the chain-and-cog model due to the fact that the teeth always have to be the same distance apart. So since we're limited to discrete numbers of teeth, we're always going to run into a situation where the more teeth you have in the rear, the less difference there are between cogs; thus you get jumps from 17 to 19, then even higher you get jumps of 21 to 24.

I would love it if it were possible, but I doubt it is due to simple geometry.

What exactly is the difference between the Ultegra and DA Di2 wiring? I read that the Ultegra wiring was "smaller," but I was under the impression that it was still external and just as unsightly (if you care..) as the DA version.

Honestly, I can't see why you wouldn't be able to use whatever damn cables you felt like, if you can junction them to compatible terminators. How much electricity can they possibly be running?

'Unslightly'? It's hidden under the down tube for crissake. You can only see it if you turn the friggin bicycle upside down.

Another 41 Idiot Contest. It's like a 9 way tie as usual.

Don't you turn your bike upside down when you clean it?

I actually didn't know the wires ran underneath. I've only seen a few Di2 bikes, but never payed too much attention since I wasn't looking to buy one. I figured with the battery being on the top tube and it being the "main junction," there would be at least some wiring visible on the top tube. Not that it's even a big deal considering we've been looking at exposed shift/brake cables forever...

So the wiring system is still pretty much the same, only with smaller wires? Is that right?

'Clean it'?

The staff does that.

I just read here that Ultegra Di2 will have aluminum brake levers rather than carbon. This article was reviewing a prototype, so maybe the production version will have carbon levers? Can anyone confirm this?