You could ask for a seatpost diameter, IP-196SL has 27.2 mm while most 650b frames have 31.6 mm. 17.5" size looks like IP-196SL, again, since other vendors produce straight 17"/18".

Quote from: Patrick C. on December 05, 2014, 09:45:58 PM

Can't you just put a 32 on the front and go with smaller rings on the cassette to get the same ratios?  Plus it would shave off about 5 g

Smaller than 10t?

Well, there exist 9t cassettes, not sure if they produce them anymore though: http://singletrackworld.com/2013/12/canfield-adds-9-36t-steelalloy-capreo-cassette/

Could you tell me what are your (approximate) brake cable lengths in your build(s) ? Got really nice offer on R1's and I'm wondering if 65/156 cm front/rear will be enough.

Thank you JoelK, it is unfortunate though, I hoped for 68mm.

Just to make matters a little more confusing, there are also adapters the other way around. I'm a big fan of BSA as threaded connectionis more reliable, less risk of screeching (bb30) or plastic parts getting wrecked (PF systems), yet I'd love to have stiffer 30mm cranks. Thankfully companies like Rotor made it possible: http://www.power2max.de/europe/en/Produkt/accessories/rotor-bsa30-bottom-bracket-for-bsa/

First of all, a really nice bike frankR !!! Since you appreciate suggestions, here are some (in fact you should easily get sub-8kg):

Extralite axles mentioned already: http://www.extralite.com/Products/Black%20Lock.htm
Starnut is the expander in your steerer tube, guess this would help: http://www.extralite.com/Products/UltraStar%202.htm
Headset and bar could probably drop around 50g together, don't know your width though so cannot suggest anything in particular. And those anvil-grips
With the saddle, there are plenty of sub 100g models, here for example: http://r2-bike.com/Saddle
For the crank you could get Absolute Black Spiderless chainring, dropping some weight and improving stiffness (not to mention the looks): http://absoluteblack.cc/sram-spiderless.html , check out their rotors too.
Couldn't do much more about drivetrain, maybe switching chain to lighter KMC.
You have already ordered wheels, which is a pity since there are a lot of options for 29er, even sub 1100g, sub 1300g with comparable or lower budget.
Brakes are fine I guess, Formulas wouldn't get you MUCH lower and XTR are probably working a little better, so a fair tradeoff.
Seatpost/Seatclamp - 30-50g to drop depending on budget

Hope this helps

When it comes to BB, some companies make BSA bottom brackets that allow BB30 wider spindle (Rotor being one example). It is a solution gathering advantages from both systems nicely.

One thing to note is the stem size, 17.5 frame would be good for you with ~90mm stem, if you want shorter stem, then larger frame.