Originally Posted by
jim319
Outer ring is a SG B53 Chainring, and there is 7.27mm of clearance between the crank arm and the face of the big ring. I'm pretty positive the crank arm is straight.
The pictures showing the lack of clearance between the chain/FD are with the chain on the smallest rear sprocket. Based on what you mention, rccardr, I'm wondering if the front derailleur might be the problem after all.
Ok--just realized what might be the problem. I'm running a 6-speed chain. I just measured the links and they are 7.76mm. I dug out my backup Sedisport chain and it's measuring between 7.02-7.1mm. This bike was originally 6 speed 105. Should I swap chains?
Could very well be part of the problem. DA 7400 was designed to work with ‘narrow HG’ chains. These days I use SRAM 870 chains but their less expensive 830 and 850 chains are also good.
If you want, I can send you a functionally fine but cosmetically challenged braze on DA7700 FD (you’ll need a 28.6mm clamp) and a used narrow chain, yours for the cost of postage.
If so, e-mail me at
rccardr@cox.net and we’ll get it done