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TM-
I take it these will work fine with DA7800 mechs?
Somebody has done a really good job of trying to answer that question:
http://www.celebrazio.net/bicycling/shimano_compatibility.htmlI can't see why you couldn't pair ST-5700 with RD-7800, but that combination doesn't appear in any of the official charts because RD-7800 was discontinued before ST-5700 was released. Front compatibility might be an issue, as I have a feeling that 5700/6700/7900 have a different pull ratio compared with 5600/6600/7800
gbj_tester
Seems a bit steep when they're being cleared out of shops at £96