Question on 5703 triple front derailleur
On my Tarmac I'm running Ultegra triple except for a FSA SL-K carbon crankset. It shifts fine with the stock 52/39/30. I'd like to run this particular bike with 53/42/32 but the 6703 front does not like the 42t middle which I presume is by design since it's rated for a 13t spread between middle and outer. I was not able to get acceptable performance based on the inner cage design so I went back to the stock rings.
The 5703 105 series is rated for 11t since it's triple is 50/39/30. Before I buy one I'm assuming 11 teeth is 11 teeth whether it's 53/42 or 50/39?
I already have the FSA chainrings to swap out, the 42t and 53t are ramped and pinned and I managed to locate the hard to find 32t 74mm ring. I ran the 53/42/32 setup on a Campy equipped bike for a few years and like that ratio of gearing. I'm hoping I can get the same thing with the Ultegra shifters since they perform so much better on upshifting between rings.
Gear Combo Guru
Correct, the 5703 front derailleur should shift well for a triple with 53-42-xx rings. 11 teeth is 11 teeth as long as you're in the ballpark of the intended size of the large ring (i.e., about +/- 10% or 45-55 teeth).
If it shifts well now I would leave the chainrings alone.