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Sora Front Derailleur

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Sora Front Derailleur

Old 06-20-19, 07:00 PM
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venturi95
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Sora Front Derailleur

Am I missing something? The cable pulls through after about 10 rides or so no matter how hard I tighten the cable binder bolt. Very annoying since I start out uphill and have to come downhill
in the small ring
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Old 06-20-19, 07:13 PM
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Bill Kapaun
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It's pretty obvious you need a NEW cable.
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Old 06-20-19, 07:40 PM
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My bad: This is the second cable in there this Summer (Spring). I know it is shot. It is unraveled from pulling through. I replaced the original one thinking the mech who put it together must not have tightened it down properly even though I checked it after a couple of rides. My thinking was wrong, as the one pictured was expertly installed by me, and it pulled through. This is the only Shimano derailleur that uses this long-ish tab to anchor the cable. The bolt was perfectly tight after installation and the tensioned cable had no flat spot to "migrate" or slide to, and it was bent in to prevent rubbing the crank arm. It worked great at first, until it didn't. Did Shimano drop the ball on this design?
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Old 06-21-19, 10:37 AM
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It's a bit hard to tell but is it possible that the cable routing is wrong? It looks like there may be a leverage tab at the top of the derailleur that the cable is not going over. I'm not sure that would explain a cable coming loose but it would cause the cable to fray over time and make shifting difficult.
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Old 06-21-19, 11:37 AM
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Might just be the angle of the pic but it doesn't look like the cable is routed correctly. In all the ones I've worked on the bolt is to the left when you're facing the drive train side of the bike. The cable always hooks directly under or over the bolt or through a slot designed for the cable that is then bolted down. This looks like the cable is a fair space above the bolt. Looks like it doesn't have the direct tension from to keep it in place with any use
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Old 06-22-19, 09:37 PM
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Yes, these newer Sora and Claris derailleurs can be difficult to set up correctly compared to the older versions. From the photo, it looks like the main error is the routing. The cable is going up and then 90 degrees straight right. The plate portion is not strong enough to hold the cable. These derailleurs are designed for the cable to go up and over the pin, then turn 180 degrees and come straight down in a U shape. The cable is mainly held in place by being pinched just left of the fixing bolt. The Shimano tech document page is a little confusing to follow, so I made a little video going over the tech document and trying to explain a few confusing points in routing the cable on this derailleur.

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