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Old 10-11-09, 04:06 PM   #1
ftsoft
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Front shifter issue

A friend asked me to look at his Santana Sovereign SE to see if I could find the problem with his front shifting. I went through the usual drill, setting the end stops correctly, aligning the cage, checking the cable tension. But nothing seemed to fix his problem of shifting from the big ring to the granny with 1 click. It seemed to me that the travel was just way too much and I wondered if there was a problem with the levers (maybe they were double levers by mistake?). The derailleur was an Ultegra 6503 and I believe the lever was a 105. Neither has triple indicated on it, although I know that the 6503 is a triple front. Not sure about the lever though. Usually I can make any drive train work given enough time, but I was hard pressed to see how to fix this. I wonder if it's a chain line issue? it seemed worse on the 2 big cogs. I admit that I didn't check to see where the chain was on the middle-middle combo. Any ideas?

Frank
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Old 10-11-09, 07:18 PM   #2
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Problem is that it goes from big ring to granny with only one click? When it should take either 2 or 3 depending on how hard you hit the lever? Never had 105 levers, but I know Ultegras wear and need to be replaced every few years. Usually they rattle pretty badly before they start mis-shifting. Doesn't sound like it's a double lever - that's too much travel. Too bad you can't take them apart and service them. It's possible to break Ultegras by hitting both up and down levers pretty hard, like with winter gloves on or just in a bit of a panic. Don't know about 105s, but bet they're the same.
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Old 10-11-09, 09:07 PM   #3
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I'd try the middle to middle chain line first. Also, you're not going to get good performance on big to big combinations. There's too much cross chaining. Also, could be a chain tension problem. Is the chain length correct?
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Old 10-11-09, 10:49 PM   #4
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The sad thing about these Shimano STI shifters is they eventually stop working, cannot be repaired and have to be replaced. Old models become obsolete and have be replaced with increasingly expensive new models ($600 for new Dura Ace). I have always liked my 7800 shifters on my single but in the future I will be using Campy or SRAM. I do believe older 105 levers support double or triple. It seems that Shimano has gone to seperate double and triple shifters on their newer models and also the new brakes are only compatible with the new levers. Seems very unfriendly. Shimano has such a large market with OEM bike companies it seems they don't care about you and I anymore.
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Old 10-11-09, 11:09 PM   #5
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My Dura Ace STI front shifter died after 10,500 miles.
Replaced them with barcons . . . cheaper/better shifting.
Suggestion: spray the heck out of the innards of the shifter with a citrus degreaser and let it sit overnight.
Has worked for me a couple times.
Pedal on TWOgether!
Rudy and Kay/zonatandem
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Old 10-12-09, 04:48 AM   #6
Chris_W
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The 105 shifter has always been for double or triple, so that cannot be the cause of the problem.

What are the chainring sizes? How close are they to the sizes that the FD was designed for? The 6503 crankset was 30/42/52, so the contours and curves on the 6503 FD will be designed to shift this combination the best, but it should still work fine on many other combinations.
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Old 10-13-09, 06:24 AM   #7
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Quote:
Originally Posted by Chris_W View Post
The 105 shifter has always been for double or triple, so that cannot be the cause of the problem.

What are the chainring sizes? How close are they to the sizes that the FD was designed for? The 6503 crankset was 30/42/52, so the contours and curves on the 6503 FD will be designed to shift this combination the best, but it should still work fine on many other combinations.
He IS running odd chainring sizes. I can't recall exactly, but I think 56/44/30. He started over and realigned everything fixed the cable tension and it seems much better.

Frank
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