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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:
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The 105 front shifter didn't work with the RSX100 front mech.
Curious, this article suggests it should.
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Thanks for linking the article, I found it very interesting. Looks like all their data is exclusively for rear derailleurs though.
I tried my best to get the RX100 front derailleur to shift with my 5700 levers, but the range of motion was just not great enough. I can only assume the cable pull/shift ratios of front shifters/derailleurs have changed over the years as well.I can't seem to find any numbers for front shifters/derailleurs, might have to do a bit of experimenting and try to generate some data!
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True, but I'd be surprised if they tweaked the front independent of the rear and the range of required movement hasn't increased: however, practice > theory.
Although it has occurred to me that the article only refers back as far as 8 speed.
Front derailleurs don't seem to follow the same rules as the rear though: I've seen it suggested to swap pre-YAW SRAM 10 speed FD for Shimano to improve shifting.
Perhaps because they are, in general, quite crude compared to the rear...
GreatSince78
Scilly.Suffolk-
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Shimano front derailleur compatibility
Posted by
@wjrh
Hello knowledgeable people of lfgss
Trying to sort myself out a bike whilst at my parents for Xmas.
Does anyone know if a 105 5700 front sti will work with a 90's shimano RX100 front derailleur? I can't use my old 105 front derailleur since it's oversized and won't fit on my 531 frame.
Cheers
Will