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Front Derailleur Problem

Old 07-06-10, 07:50 AM
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Front Derailleur Problem

I have a Sugino compact triple with a Tiagra front derailleur. I am using STR shifters, the Shimano unit for small handed people. I can't get a decent shift into the big ring. I have tried adjusting the cable, checked the stops, even the alignment of the cage. Not working. What am I missing? Wrong derailler for my set up? It's an 8 speed set up. Dang.
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Old 07-06-10, 08:00 AM
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Can the derailleur swing out far enough to make the shift, even with the high limit screw backed out all the way? Perhaps your crank spindle is too long and places the crank too far outboard.
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Old 07-06-10, 08:29 AM
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Can you more accurately describe the problem? What constitutes a decent shift into the big ring to you? Are you getting derailler cage rub when in the big ring?
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Old 07-06-10, 09:15 AM
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Originally Posted by HillRider
Can the derailleur swing out far enough to make the shift, even with the high limit screw backed out all the way? Perhaps your crank spindle is too long and places the crank too far outboard.
Dang, good point. The screw is indeed all the way out.
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Old 07-06-10, 09:18 AM
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Originally Posted by joejack951
Can you more accurately describe the problem? What constitutes a decent shift into the big ring to you? Are you getting derailler cage rub when in the big ring?
With a good push the chain goes against the ring but won't go up. Now, that is with the middle and small ring set up. When I try to bias it towards the big ring, it sometimes goes but with effort.
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Old 07-06-10, 10:09 AM
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Originally Posted by HillRider
Can the derailleur swing out far enough to make the shift, even with the high limit screw backed out all the way? Perhaps your crank spindle is too long and places the crank too far outboard.
So I checked the bottom bracket, I am using a 107 bracket and Sugino suggested 113, so I should have enough throw length.
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Old 07-06-10, 10:21 AM
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Which tiagra front derailleur do you have? And what the heck is an STR shifter? XTR is a flatbar shifter. STI requires a flatbar specific derailleur.
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Old 07-06-10, 10:24 AM
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Double check that you have not much slack in the cable when shifted to to the small ring. I had a similar problem, and had slack---so was unable to get enough pull to go onto the big ring. After taking out the slack, it worked.
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Old 07-06-10, 11:02 AM
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Originally Posted by operator
Which tiagra front derailleur do you have? And what the heck is an STR shifter? XTR is a flatbar shifter. STI requires a flatbar specific derailleur.
It was Shimano's STI for people with small hands. I think its Ultegra level. STR 600 or 700 I think.
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Old 07-06-10, 12:54 PM
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Originally Posted by etherhuffer
It was Shimano's STI for people with small hands. I think its Ultegra level. STR 600 or 700 I think.
That would be ST-R600 or ST-R700.
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Old 07-06-10, 12:55 PM
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Originally Posted by etherhuffer
With a good push the chain goes against the ring but won't go up. Now, that is with the middle and small ring set up. When I try to bias it towards the big ring, it sometimes goes but with effort.
You need more cable tension. Once you add more cable tension you'll also need to adjust the high stop screw to keep the chain from shifting off the big ring. Read up at www.parktool.com and start over from the beginning. A little extra time spent getting things totally right from the beginning will save you a lot of aggravation and time later.
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Old 07-06-10, 12:58 PM
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Originally Posted by joejack951
You need more cable tension. Once you add more cable tension you'll also need to adjust the high stop screw to keep the chain from shifting off the big ring. Read up at www.parktool.com and start over from the beginning. A little extra time spent getting things totally right from the beginning will save you a lot of aggravation and time later.
I am going to check that as well. Although, I really have a lot of resistance on the last upshift already.
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Old 07-06-10, 01:44 PM
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Make sure you have the correct stop screw backed out. If you are concerned about the resistance, disconnect the cable and try moving the derailler by hand. Can you get the outer cage well past the big chainring? If so, the resistance you are feeling is simply the front derailler's return spring. You may want to check that your cable is routed correctly through the bottom bracket cable guide and that your derailler housing and ferrules are in good shape.
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Old 07-06-10, 02:07 PM
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Everything is brand new, and all the cable routing good as this is a new build I did. But I will disconnect the cable and see.
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