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Front Derailleur unable to shift to large chainring...

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Front Derailleur unable to shift to large chainring...

Old 05-29-13, 11:36 PM
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Front Derailleur unable to shift to large chainring...

Hey y'all - here is my current situation: my front derailleur (Shimano 5700) will not move the chain to the large chainring. The limiting screw is literally almost completely detracted from the derailleur.

A little background:

Just upgraded the bottom bracket on my Nashbar X cyclocross frame from a 108mm Shimano 5700 bb to a 113mm Nashbar ISIS bb. The former was spaced out by about 4mm with the help of two shims on both sides in order to provide adequate clearance for the crank arms - to which I discovered (while replacing it) caused enough stress to begin shredding the threads on the bb - so I'm relieved to see my replacement provides the correct amount of clearance.

Originally rocked a 172.5mm Shimano 105 Hollowtech II crankset with a 48/38 set up, then put a new crank set on, a 170mm Nashbar CR2 compact crankset w/ 50/34 set up, which clears the frame perfectly fine.

I figure these are all the necessary details to pin-pointing my issue, however I feel that the problem is simply that my front derailleur is a road derailleur (Shimano 5700), which cannot compensate for the spacing on the frame, which is more than likely developed for a mountain derailleur, given it's a cyclocross frame.

Or...would the clearance be the same with way? This is where my confusion sets in. Clearly the issue is the type of derailleur I have on the frame as opposed to the bottom bracket or crankset, given the latter two fit perfectly with the frame. It also makes sense that a road derailleur would have an issue on a cyclocross frame built to accommodate mountain components. Should I switch to, say, a Shimano Deore type derailleur? However, I want to make sure there isn't something I'm overlooking.

I'd really appreciate some constructive feedback from anyone with insight on this issue! Thanks, all.
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Old 05-30-13, 02:19 AM
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shift into the smallest ring with your shimano shifter. feel the tension in the cable running from the front shifter to the front derailleur. if it's loose, tighten that. 90 percent of the time its not having enough cable tension.
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Old 05-30-13, 04:55 AM
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First ensure that the derailleur cage is parallel to the chainrings. See if you can shift to the large ring if you move the derailleur out by hand. If it will not move far enough that way the cable will not be able to do it either. If it will not move far enough, look and see what is keeping it from moving farther. There is usually a little nub which the high limit screw engages. A bit of judicious filing may remove enough metal to allow the cage to swing out far enough. I have successfully done this in the past, not with your particular derailleur.
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Old 06-04-13, 12:01 AM
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Thanks all. Shortly after posting this on the forums, I realized the problem was indeed a loose shifting cable, and got that fixed immediately. However, while the derailleur moved to the top ring, the chain was rubbing quite fiercely against the derailleur cage. Turns out the 105 brifters have a trim-relief that allows the derailleur to be moved over slightly farther, thus relieving the chain rub, though the reasons why are still a little foggy for me. Either way, it was working great until I kept having an issue with not getting the derailleur dialed in where I need it. I realized part of my problem was that the threads for the high-gear limiting screw were stripped out on the actual derailleur body...soooo now I'm in the market for a new front derailleur.

I'm thinking of just picking up a cheap Sora 2x9 front derailleur for practically just shipping costs on eBay, though the new Shimano FD-CX70 looks quite appealing. Considering I decided to upgrade my Tektro Oryx's to a complete set of Avid Shorty 4's I also found on eBay for a good price, I'll probably just try out the Sora and go from there.

Thanks for your replies!
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Old 06-04-13, 08:36 AM
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It may not be a total dealbreaker; it might not throw the chain if you manage to set up the FD just right.
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