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Old 10-14-09, 06:47 PM   #1
RobbieTunes 
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BB swap-out, a little long on the R...

I swapped the standard square taper double bb out of a 1987 Lemans RS (126mm rear) that I first upgraded to 8-sp drivetrain, and now have upgraded to triple.

I used an Ultegra Octalink bb, 118mm for triple, and a new triple Tiagra crankset.
The triple FD is RSX and the long cage RD is Sora, with Sora 3x8 STI's.

Everything went on well, and easily, the RD is smooth. The bike rides well and shifts effortlessly on the small ring and middle ring. No matter what I set it at, I can't get the reach for the big ring.

I've got a lot more room between the chain stays and the chain rings than on any of my other bikes.

It seems like a step down to a double Octalink may do the trick. How about it?

I'm using self-extracting crank arm bolts, and don't worry, I'm getting them in far enough.

Thanks.
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Old 10-14-09, 06:55 PM   #2
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One possibility is that the shifter was not in its lowest position when the cable was attached to the FD.
Flip the smaller front shifter several times and see if you can pull any slack out of the cable at the derailleur end. There should be no slack.
Is the FD designed for a triple?
Suggest that you use the instructions for setting up and adjusting a FD as found at http://www.parktool.com. Do all of the steps in sequence leaving nothing out.

Al
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Old 10-14-09, 07:21 PM   #3
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Quote:
Originally Posted by RobbieTunes View Post
I swapped the standard square taper double bb out of a 1987 Lemans RS (126mm rear) that I first upgraded to 8-sp drivetrain, and now have upgraded to triple.

I used an Ultegra Octalink bb, 118mm for triple, and a new triple Tiagra crankset.
The triple FD is RSX and the long cage RD is Sora, with Sora 3x8 STI's.

Everything went on well, and easily, the RD is smooth. The bike rides well and shifts effortlessly on the small ring and middle ring. No matter what I set it at, I can't get the reach for the big ring.

I've got a lot more room between the chain stays and the chain rings than on any of my other bikes.

It seems like a step down to a double Octalink may do the trick. How about it?

I'm using self-extracting crank arm bolts, and don't worry, I'm getting them in far enough.

Thanks.
Have you ridden the crank like this?
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Old 10-15-09, 06:03 AM   #4
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Originally Posted by Al1943 View Post
One possibility is that the shifter was not in its lowest position when the cable was attached to the FD.
Flip the smaller front shifter several times and see if you can pull any slack out of the cable at the derailleur end. There should be no slack. None.
Is the FD designed for a triple? Yes
Suggest that you use the instructions for setting up and adjusting a FD as found at http://www.parktool.com. Do all of the steps in sequence leaving nothing out.

Al
The FD is set up properly, but I'll re-do it. Thanks.

If the chain rings were about 4-6mm closer, they'd still clear the stays quite a bit and I'd reach the big ring.
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Old 10-15-09, 06:03 AM   #5
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Originally Posted by operator View Post
Have you ridden the crank like this?
Yep, it rides great on the small and middle ring, fluid and easy.
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Old 10-15-09, 01:31 PM   #6
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If the chain rings were about 4-6mm closer, they'd still clear the stays quite a bit and I'd reach the big ring.
That's not why you use a 118mm axle. It is to match the front to rear chainlines.

Can you get the front to shift if you move the FD manually? (Be careful of your fingers when trying this.)
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Old 10-15-09, 03:04 PM   #7
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That's not why you use a 118mm axle. It is to match the front to rear chainlines.

Can you get the front to shift if you move the FD manually? (Be careful of your fingers when trying this.)
Forgive the questions, but I'm learning, here.

That's what I figured on the chainlines, but Tiagra and Octalink generally came on 1300mm rear bikes, correct? This is a 126, but I've squeezed an 8/9/10 rear onto it, so it's effectively 130, so the chainline should be good, I'd assume.

Everything tells me this should work. The FD is an RSX triple. RD is a Sora long cage. Crankset is a Tiagra triple. I have a Dura Ace triple I can put on there, just to see if it's a crankset thing.
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Old 10-15-09, 05:09 PM   #8
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Why don't you try what I suggested?
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Old 10-15-09, 06:02 PM   #9
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What is the chainline on the crank? Measure the distance between the centre of the middle chainring to the middle of the seat-tube.

Also test DMF's procedure, you may be off by one-click on the shifter.
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Old 10-15-09, 06:24 PM   #10
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Why don't you try what I suggested?
Because I won't see the bike again until Oct 31

At that time, I'll start at zero, on the FD, see what happens, with all the suggestions...
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Old 10-16-09, 05:32 AM   #11
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Did you torque the crank bolts to the shimano spec? This is hard to do. What seems tight with a normal wrench is about 1 full turn from actually being properly torqued as the crank arms "form" to the axle. I recently did a similar upgrade.
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Old 10-16-09, 02:55 PM   #12
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Did you torque the crank bolts to the shimano spec? This is hard to do. What seems tight with a normal wrench is about 1 full turn from actually being properly torqued as the crank arms "form" to the axle. I recently did a similar upgrade.
That's kind of my thought. I have an idea how far "in" it should be.

What I'm going to do, next time I see it (it's sitting right now) is go through all these steps.
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