I am fixing up an older touring bike (late 80's Nishiki Cresta frame). It currently has a Crane GS deraileur and a 7 speed freewheel with bar end shifters. There are no down tube shifter bosses, but I want down tube shifters. I have seen clamp on shifters on ebay.
If I buy the clamp on shifters what are the odds that I can take the levers off and fit some 7speed 105 dt shifters on the bosses of the clamp? I am thinking that the bosses are pretty universal, is this true?
If I use a Deore xt 7 speed rear deraileur and a set of deore xt hubs that I have sitting around will that index with a sis 7 speed 105 downtube shifter?