Shimano Dyna Sys 10 Speed setup is now available from Jensen USA spot on for you early adopters and prices seem good. Personally I am waiting to see XTR and hope has 2 rings not 3 which Is my only problem with the shimano 10 speed at the moment.

http://www.jensonusa.com/search/?s=shimano+dyna+sys

http://www.cyclistno1.co.uk/news/shimano-xtr-10-speed-m980-2011.htm

http://www.singletrackworld.com/2010/06/shimano-xtr-2011/

SO when the inevitable happens (unless they make a 36t 9sp cassette) and I end up buying 10sp, do existing freehubs, mechs work with it (assuming new shifters, of course) or is it all new standards ?

Merlin had it a couple of weeks ago, bit behind the times aren't you!?

They do a 12-36 9 speed cassette, no implications there'll be a 9 speed 11-36 though.

Existing freehubs work, mechs don't allegedly, it's a new cable pull ratio.

So you need new mech, shifters, cassette and chain, and chainrings would be ideal.

The ratios on the XTR 2×10 look a bit gay to me, SRAM have done a better job with the wider ratios IMO.

njee, have you got post-count targets to meet or something?
you're on every thread 😀

njee, who makes a 12-36 ?

its some deore lump

Scaredy pants- Shimano Deore do a 36T 9 speed. You MUST have a shadow mech to work with it.

The 12-36 9 speed is a Deore HG61 cassette aimed at 29'ers but has been used for 1×9 and 2×9 set ups on 26" wheels too.

njee, have you got post-count targets to meet or something

I'm exceptionally bored!

do you have to be careful using deore on hope freehubs?

It's not really a case of being careful, it will eat the freehub. As long as you don't mind removing it with a hammer it's fine!

(may well have been posted while I was on holiday – soz)

SRAM 11-36 9sp cassette
$299 on Jenson 😯
(listed s 11-32 but a mistake I think)