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Let me know how you get on with this, I have dreams on getting an aeroad with the intention of using my sram gxp p2m too. Seems to me there are a few options.
a) Remove shimano BB and install bb86 gxp pressfit BB as linked .
b) Possibly can also do it using the shimano BB already installed and a step down adaptor (like so http://www.chainreactioncycles.com/hope-bottom-bracket-truvativ-gxp-converter/rp-prod26899 ) on the NDS bearing, which would mean no faffing of removing and installing press fit BB's.
c) Use a better BB than the sram gxp one which may be prone to clicking etc, like the ones that thread together
http://wheelsmfg.com/bottom-brackets/bb86-92/bb86-92-bottom-brackets/bb86-92-outboard-angular-contact-bb-for-24-22mm-sram-cranks-black.html
or
http://wheelsmfg.com/bottom-brackets/bb86-92/bb86-92-bottom-brackets/bb86-92-outboard-abec-3-bb-for-24-22mm-sram-cranks-black.htmlThat's as far as my research went, until I realised I am a long way away from ever actually pressing the order button :/
ah right, yeah. Having to buy a new bb is fine.
shopping list:
-SRAM BB86 GXP PressFit bb
-Sram force 22 170mm compact gxp cranks
whats the consensus or sram cranks with shimano groupset?