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If you want it cheap, don't use Di2. Friction shifters are fine, especially for shorter stuff.
What do you get included with the P2? Do you need wheels, etc?
I have a set of Shiv bars (with the adapters that don't kill you) sitting on my dining table.
http://www.tredz.co.uk/.Specialized-Carbon-Aerobar-and-Aero-Stem_89106.htm
They ain't cheap though and I was going to use them on the PX to replace the older PRO bars.
Low-Stack 'fix' example on left.Fast people ride Castelli. Fast people ride NoPinz. Good luck getting data without paying £££ testing or buying both and DIYing with Aerolab.
I didn't like the fit of Castelli so went with NoPinz.
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P2, TriRig Omegas, Tulas. Single chainring, grind off the FD mount. Fast bike.
NoPinz suit is as fast or faster than BP3, and it won't fall apart at the sight of a pin.
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brakes
I've got a DA AX brake that @umop3pisdn freecycled (+ post) to me: same to you.
Or a centre-pull Tektro (I think) that was OE on a 2014 Felt B12: marked R725 but a quick Google says they're U-brakes. £15 + post? No brake pads or holders, but I might have something in "the box".
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I intend to get that P2 of TT forum.
Did you decide on this?
There's a medium Transition on TTF for £600. Good enough for @umop3pisdn 's favourite tester/twitterer - All it needs is wheels.
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So I will build with Di2 components.
Also, DI2 on the old style P2s isn't necessarily easy. Either you end up using the stick on external cable routing that Shimano sell, or alternatively you end up doing some drilling (e.g. http://forum.slowtwitch.com/cgi-bin/gforum.cgi?post=4955231;search_string=internal%20p2%20di2; ) and even then I think you'd need to be pretty inventive to hide the battery.
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Right. Aerodynamicsts Assemble!
I decided against the Trek SC. It's too much money. Better to get a cheaper frame and splash the few pennies I have on better watt savings than a frame. Though I did want the box so I can put an innertube in it :(
I intend to get that P2 of TT forum.
So I will build with Di2 components.
What else should I get? Cheaper the better.
I have a tub tri spoke, so a clincher jet 9 will be last on the list ish.
I have raltech covers, so a hed jet disc will be lower on list.
I need, total front end (handlebars), brakes. Okay so only 2 things. Which should I get?
Cheaper the better, but front end is a good place to buy speed.
Also skinsuits. Is an no pinz going to be better than a castelli bodypaint with well pinned numbers?