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Down Tube Index Shift when out of saddle? Fix?

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Down Tube Index Shift when out of saddle? Fix?

Old 02-25-12, 05:02 PM
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TheFixter
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Down Tube Index Shift when out of saddle? Fix?

Hey All,

I have a 1985 Raleigh Kodiak touring bike with Shimano Deore Gruppo. For some reason when I am out of the saddle riding up any hill the bike will down shift and riding of course gets harder.

I try to tighten the lever so that it won't shift. But all it does is make shifting much harder, and then eventually it loosens up and shifts again... or just continues to move until it shifts.

Anyone ever encountered this or know how to fix it?

Thanks
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Old 02-25-12, 05:36 PM
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You might be experiencing frame flex and that's causing the shift. Try adjusting the trim screw 1/2 turn in either direction to see if it helps.
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Old 02-25-12, 05:51 PM
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Trying cleaning the track where the cable goes under the bottom bracket and putting a small amount of lube on the cable. Sometimes the cable gets hung up in the grime when the frame flexes. I had the same problem and that worked for me.
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Old 02-26-12, 01:09 AM
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thanks guys. Ill try that. The frame certainly flexes a lot, which is why its so comfortable. But I didnt understand why it slowly shifts down. But I think you already said the fix. So I will give it a try. its done it for the last two years I have had it. But I never lubbed under and the guy i bought it from purchased it new in 85 and hung it in his garage until I got it.

One of those good finds where no one ever rides it and stores it inside. $200.00!
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Old 02-26-12, 04:28 AM
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Originally Posted by thinktubes View Post
You might be experiencing frame flex and that's causing the shift. Try adjusting the trim screw 1/2 turn in either direction to see if it helps.
Whats the trim screw?
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Old 02-26-12, 06:29 AM
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you an indexing DT shifter that outo shifts while climbing out of the saddle? That sounds weird to me. A index shifter needs to be pretty loose to slip and shift on its own.

this is a six speed setup? I suspect you have an issue with the inside of your shifter, and some early 600/Ultegra shifters were known for the tabs on the back of the shifter breaking off, which would cause the shifter to work in a sloppy manner.

Pics?
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Old 02-26-12, 12:00 PM
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Its a Deore friction shifter. 6 spd rear deore Der. Nothing to take pictures of really...
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Old 02-26-12, 12:06 PM
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wait, this is index or friction?
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Old 02-26-12, 12:09 PM
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Originally Posted by TheFixter View Post
Its a Deore friction shifter. 6 spd rear deore Der. Nothing to take pictures of really...
Down Tube Index Shift when out of saddle? Fix?

I am not sure where I got the indexing idea
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Bianchis '87 Sport SX, '90 Proto, '90 Campione del Fausto Giamondi Specialisma Italiano Mundo, '91 Boarala 'cross, '93 Project 3, '86 Volpe, '97 Ti Megatube, , '90 something Vento 603,

Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '09 Motobecane SOLD, '?? Jane Doe (still on the drawing board), '90ish Haro Escape
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Old 02-26-12, 04:11 PM
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Originally Posted by Bianchigirll View Post
Down Tube Index Shift when out of saddle? Fix?

I am not sure where I got the indexing idea
Haha oops my Bad!
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Old 02-26-12, 04:31 PM
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So to recap, tighten the shift lever if it's friction, not index.
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Old 02-26-12, 09:35 PM
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Should he put some sort of threadlocker on there or something? It seems like the screw is working itself out and the lever keeps getting loose form what he's saying.
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Old 02-26-12, 10:15 PM
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Originally Posted by himespau View Post
Should he put some sort of threadlocker on there or something? It seems like the screw is working itself out and the lever keeps getting loose form what he's saying.
ok So here is the FINAL recap.

It is indeed FRICTION.

I Do tighten the shiftlever. And it will still shift on its own, ONLY when out of the saddle climbing. Even when it is tight. It Might take longer but it will down shift once during a punchy climb when tight. Versus maybe 3 times when tighten to where I think it should be. ( Not too loose, but not too tight, just right "said goldie locks."

I'm not trying to brag or anything but I am a fairly good climber and at 165 lbs I produce a lot of power (I am a cat 2 cyclist.), thus causing the frame to flex more than I like, which is why I do not use this bike for training. Merely touring.

I also don't like tightening it a bunch because then its just a pain in the ass to shift.
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Old 02-27-12, 06:39 AM
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Have you tried taking it apart and cleaning it? then put it back together dry with just a dab of grease on the screw.

Are these the funky shifters that take the round base? they may be simply worn out and need replacing
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Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '09 Motobecane SOLD, '?? Jane Doe (still on the drawing board), '90ish Haro Escape
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Old 02-27-12, 11:34 AM
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If they lockup when you tighten, but are too loose otherwise, the two spring bushings inside are probably worn. Those concave black discs made of spring metal apply just enough pressure to hold the levers in place, without you having to over-tighten the mounting bolts. Definitely clean them and the cable path, but they're not expensive to replace if needed.
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