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@dicki
and ...
are the Dura Ace 7800 and 7900 rear mechs direct pull mechanically or are they ratcheted and leveraged ?
or in other words can i put an old fashioned friction lever with a 78(9)00 rear mech or does it need a 7800 / 7900 brake shifter combo ?
these
http://bike.shimano.com/media/images/cycling/products/bikecomponents/SL/SL-7800_popup_v1_m56577569830551357.jpg
or these ?
http://www.fawkes-cycles.co.uk/images/st7800.jpg