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xtr:
Ball bearing races are ground with Cubic Boron Nitride
titanium freehub

so weight-weenie things...

EDIT: XT also has Cubic Boron Nitride ground races, but XTR has some special thing done to the cups as well. So (theoretical) faster rolling...

You could change the rear caliper to a post mount ala rs785 (or a mtb shimano one).

(I would be happy to take the spare flat mount caliper off your hands :))

post (bike) > flat (caliper)

That adapter does not exist (yet) so no

then a diy project :)
get a removable core and a thread tap with same size.
Cut down valve on your favorite tube.
Tap valve stump with new thread
Screw removable core in

(Not tested.....)

Michelin has one with a 38mm valve

38mm 700 x 18-20 C
40mm 700 x 22-23 C
60mm 700 x 22-23 C

avid g2 or g3 solid sweep have no cutout at the rotor legs: Works fine.

The newish Sram Rotor Centerline looks good too (what I would buy.):

hs1 works with thinner pads so probably not for your setup:

...with a aero'ish profile (+ 24 holes).
I'll just end up buying the r460 because nothing beats the price.

Thanks for the suggestions

Thanks I think that is the confusion, disc version 22mm non disc 23mm:

I demand wide(r) disc rims!... (probably splitting hairs)

rosebike have the 32h disc version:
https://www.rosebikes.com/article/dt-swiss-r-460-db-disc-road-bike-rim/aid:863129

Are the r460 disc version 22mm or 23mm wide? Any one care to measure? Gets listed as both different places

I like the Halo aerowarrior rim. It is listed as 550 grams but the 3 Ive had all were about 500 grams.

They both use m6 thread so you can change to the type you like:

I have changed to the grub screw for a more secure bond when bleeding the brakes (+ more æro, less weight...:))

it looks like a novatec d042 hub. Cheap if you can wait a month:
Aliexpress link

ahh ok

Fork has a carbon steerer, but...

On a fork the top cap is only for preloading the headset (and later act as a raincover...) and after you tighten the stem it is only the stem that holds the fork on.

I like the mini 3 spoke!

Thanks. Its fun to make stuff (and also a sort of procrastination...)

No.
They both use mineral oil and the same type of standard fittings. The pistons are not the exactly same size (something like 21mm vs 22mm) but I have not noticed that (like using slightly different cable pull on mechanical brakes).

edit: Ok the above is not wrong but a bit imprecise: Shimano and hylex use the same m8x0.75 compression nut, but the olive+barbs are different. Its easy to use the correct kind.

sorted out routing the front brake hose through the fork steerer. Now with a connection point.

It is a piece of handlebar with m20 thread cut on the inside that is epoxy glued into the steerer tube.

and then a m20 crank arm bolt is used as a top cap. The hole in the middle is a perfect fit for a brake hose fitting.

It would be a really neat solution if the crank arm bolt was slightly larger as now it needs another topcap with a big hole cut in it underneath to work (the greenish bit in the first photo)

or try a positve angle stem

This one?

Has anyone seen a aero drag test of the planet x track bike? Or a comparison to other frames?

any links?

There is the aliexpress/ebay one:

370mm axle-to-crown , 40mm rake
Fits a ~25mm tire and quality control is a bit shit but cheap!

There are loads of sellers for example: http://www.ebay.co.uk/itm/Bike-Carbon-Fiber-Fixed-Gear-Front-Fork-for-V-Disc-brake-28-6mm-700C-1-1-8-TY-/141731092565

The top is 50mm wide (if you are into aesthetics...)

23mm tire on 24mm rim

the corinthian treatment:
http://www.youtube.com/watch?v=lVsWAuKSj-0

(but everyone looks evil with that)

there is no F in HHSB

No just thought it was fun.