I am trying to buy the parts to convert my double chainring dura ace into a triple chainring, in prep for the cross-Great Britain ride this summer - Lands End John O Groats. I have seen a few varying postings re what parts I need to replace: obviously the crank, the FD, the RD (which I cant see why I'd need to change that) and the BB. Then I read somewhere that if you want to use the Dura Ace Triple chainring and you had the 7800 Double Compact Crank you didnt need to change the BB........so I am a bit confused! Any help would be great! I got the bike with the 2005 model of the compact crank set.