do you need special seat rail clamp for them? I am using an old Thomson seatpost and don't know if the clamp would work for those carbon rail

Do you have a picture of the clamp? Generally speaking, if the post clamps from the top and bottom of the rail you are all set. The ones that have one horizontal bolt for clamping and the clamping forces are on the sides of the rails will not work.

Yup. Well you can with the CS-FS27. I've already checked with Peter on that. He did mention that it isn't quite ready for the market yet. Still doing some fine tuning.

I have been checking out these two for a friend of mine. Both look promising but the XM one is pretty slack. I've had great luck with Peter at XM so I'm wanting to go that route as long as the geo will work. But I think that's the one you said you didn't want as the HA is off.

To be honest, I am leery of getting a chiner frame without a unified rear triangle. I'm not sure why really but I am. I've always been a fan of the unified triangle mainly for stiffness but I just foresee issues with flexing and getting bushings and such.

http://www.xmcarbonspeed.com/Productinfo.asp?f=1485

http://m.dengfubikes.com/index.php?s=/174.html

Are you sure you mean the 106? That is a fat bike with a BSA 100mm bottom bracket. They do have the 078 which is a 29+ bike. I started a thread on that frame in the plus section about a year ago.

We will put an SRAM Eagle on it. Does it need the boost version of the crankset or is the frame already takes care of the 52mm chainline?
The groupset was bought complete, but I'm wondering the crank need to be exchanged.
The BB is BB92, and the width of the BB shell is... 92mm !

The others are correct. The standard offset it 6mm, boost is 3mm, and BB30 cranksets use 0mm offset. If you have a BB92 bottom bracket, definitely get the 3mm offset. With the BSA stuff, you can shift a GXP crank inboard by using a non drive side bb spacer so you can essentially use a 0mm offset ring with one NDS spacer and still be good. But with the BB92 bb, you can't do that. So you really should get the right offset chainring.

As far as the crankset itself goes, you just need a GXP BB92 bottom bracket. It will need to be pressed in but otherwise, all Sram GXP cranks will work once it's installed. My daughters bike has a BB92 bottom bracket and a Sram Stylo GXP crankset that was previously installed on my SS with BSA bottom bracket.

I am big fan of the Sram GXP setup. For me, it has been perfect and I have 5 bikes at home with cranksets that are completely interchangeable. Well, sort of, my daughters is a bit short at 150mm.

Nextie has an eBay store with some rims listed under $150 with free shipping. That may be slightly cheaper on eBay but I'm not sure it would save enough money to warrant the risk. I'm all for trying the cheap options but not for a $20 savings.

Well I tried...

I forgot you aren't in the US. If I recall, you're in Denmark correct? I can bring some to you in July but you will have to meet me in Switzerland.