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Thanks for your response. The 105 front shifter didn't work with the RSX100 front mech. I shimmed it as you recommended and all went well!
wjrh-
The 105 front shifter didn't work with the RSX100 front mech.
Curious, this article suggests it should.
Scilly.Suffolk
Hey Will, not sure about your compatibility question but I'd say if your 5700 left shifter and RSX100 front mech are both for a double chainset then they should work fine.
I think a better solution though would be to just use a shim in conjunction with your 5700 front mech and 531 frame... I presume the clamp on the 5700 front mech is for 34.9mm or 31.8mm tubing, but your 531 frame likely has a 28.6mm seat tube, if so you can easily find shims online to go from 34.9 or 31.8mm down to 28.6mm. Here's an example of what you need:
http://m.ebay.co.uk/itm/Shimano-SM-AD17-Front-Derailleur-Clamp-Shim-Adapter-Reducer-34-9-to-28-6-or-31-8-/262135585765?varId=560903397243