Fd compatability
 

Crankset FC-5503 (52-42-30) with FD Ultegra 6503.
Tried replacing FD with new Ultegra 6703 because old one had a worn cage, and the new had better leverage.
However, 6703 capacity is minimum difference between top and intermediate 13T mine is 10T.
Front chainwheel difference is 22 or less. I am ok there.
Anyway, installed the new one, but couldn't get it to work properly, and reverted back to the old one.
My existing chainwheel does even meet the FD 105 5703 requirement of 11T difference.
One solution would be to replace middle chain ring of 42 with 39 if I could find one with 130mm bolt circle dia. or the expensive solution of replacing the whole crank and BB.
The new FD is for 3X10, but I have 9 speed cassette, but I don't think this would give me a problem if I met the chainwheel spec.
Is there a solution around this other than the above? Views are appreciated.

if less t difference and it wont clear the middle chainring. 10 should still be OK*
raise the FD on the seat post a bit. so it clears the middle chainring.

the chain line on the front should line up with # 5 of 9 in the cassette, the Middle.


*I'm running a 50-40-24t triple , friction bar ends and old way Pre STI FD's .. it works fine :50:

a 40-46 difference is another story , there you have to stray from the owner's manual suggestion ..






...

Thanks for the quick response.
I had set the height a little over 1mm. Spec is 1-3mm so I should probably set it a little over 3mm.

Raise it till it shifts good. Maybe 2mm or even 4mm or more.

John

+++++++ Exactly.

Thanks for yr responses.
I raised it 5mm just to be sure the cage clears the mid-ring, and it shifts fine.
Great help.