are the Dura Ace 7800 and 7900 rear mechs direct pull mechanically or are they ratcheted and leveraged ?
The ratchet is in the lever. You can drive them with an old fashioned friction lever, but it might it might not pull enough cable to get all the way across a 9/10 speed cassette.
The ratchet is in the lever. You can drive them with an old fashioned friction lever, but it might it might not pull enough cable to get all the way across a 9/10 speed cassette.