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Front derailleur help

Old 10-17-20, 07:13 PM
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Chris!
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Front derailleur help

Having a hard time getting my front derailleur dialed in. Its a 2x10 shimano tiagra 4700 along with the shifters. I drop the front to the smallest and the rear to the largest. I loosen the bolt and pull the cable, tighten back down. Set the limit for this. It will smoothly and quickly shift to the larger chain ring but I cannot get the chain to not rub the derailleur. I have detached the derailleur and checked alignment and distance from cogs. Any help would be great, cause next step is to burn the bike down. 😄
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Old 10-17-20, 07:24 PM
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After loosening the bolt, do not bolt the cable down just yet. Adjust the lower limit screw so that the inner part of the cage is barely touching the chain. Now, pull the cable tight and bolt down. Try shifting into the big ring; adjust accordingly with the outer limit screw.
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Old 10-17-20, 08:18 PM
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Agreed that the new generation of Shimano ft ders need fairly high cable tension. Doing what primov8 says is one way to end up with a tight cable. Is there a cable adjusting device in the system? Andy
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Old 10-17-20, 08:23 PM
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Originally Posted by Andrew R Stewart View Post
Agreed that the new generation of Shimano ft ders need fairly high cable tension. Doing what primov8 says is one way to end up with a tight cable. Is there a cable adjusting device in the system? Andy
There is an inline barrel adjuster but it doesn't do enough.
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Old 10-17-20, 08:51 PM
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Thanks! That did it.
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Old 11-07-20, 09:08 PM
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So Im having issues still...... out riding today and dropped to my lower front chain ring. Could not get back onto the large chain ring. If I adjust my derailleur any further ill rub in my small front big rear. If it helps im running a 46-30 adventure crankset, tiagra front derailleur, shimano 11-35 cassette and a GRX rear derailleur along with tiagra STIs.
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Old 11-08-20, 10:42 AM
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Are you using a double or triple FD? I'm wondering if the cage shape is not ideal for the smaller chainrings. Most road FDs are shaped for 50-53 teeth outer rings.
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Old 11-08-20, 10:50 AM
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Originally Posted by Chris! View Post
So Im having issues still...... out riding today and dropped to my lower front chain ring. Could not get back onto the large chain ring. If I adjust my derailleur any further ill rub in my small front big rear. If it helps im running a 46-30 adventure crankset, tiagra front derailleur, shimano 11-35 cassette and a GRX rear derailleur along with tiagra STIs.
How new is the cable? This sounds like a classic new cable that has loosened as it bedded in. Shift to the inner ring and see how tight the cable is. Adjust as needed.
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Old 11-08-20, 06:56 PM
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Its actually an old cable, about 2 years old. Got maybe 2k on it. Thinking maybe next ill replace that and see how it goes.
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