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Old 10-28-10, 08:49 AM   #1
MrBlimp
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DuraAce replacement - what else

I want to put a Octalink Dura Ace BB that I have left over from another bike upgrade on my older Schwinn Le Tour that I wiped a square tappered crank on. Everything would fit but it would throw off my gear alignment and the front derailer would bottom out not allowing me to drop into the smaller chainring.

The spindle is not long enough for proper setup.

Does anyone have any info on how I could make this work?

Can I just buy a longer spindle or a different front derailer (I wouldn't mind changing it as well)?
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Old 10-28-10, 08:58 AM   #2
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Originally Posted by MrBlimp View Post
I want to put a Octalink Dura Ace BB that I have left over from another bike upgrade on my older Schwinn Le Tour that I wiped a square tappered crank on. Everything would fit but it would throw off my gear alignment and the front derailer would bottom out not allowing me to drop into the smaller chainring.

The spindle is not long enough for proper setup.

Does anyone have any info on how I could make this work?

Can I just buy a longer spindle or a different front derailer (I wouldn't mind changing it as well)?
What shifters are you planning on using?
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Old 10-28-10, 09:51 AM   #3
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Changing the shifters would be something I'd have to do if I change the front derailer so I haven't thought about that yet. Right now there are just the original old fashion friction shifters on the bike.

I had wiped the non-powered crank and was trying to go the cheapest way on the replacement to keep the bike usable.
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Old 10-28-10, 10:00 AM   #4
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By 'wiped' I assume you mean 'ruined.'

If you are looking for the cheapest possible solution, Dura Ace may not be it.
THe funny thing is, the chainline for modern Dura Ace should be similar to that of an older road bike. What type of derailleur does the bike have? Is it an old 'piston' style Simplex? Because that is the only thing I can think of that might limit the movement of the front derailleur... provided you have the lower limit screw all the way out, and the derailleur properly aligned.

Anyhoo, since you are using friction shifters, you should be able to replace the old derailleur with a basic modern one without any problem. Look for a less inexpensive model designed for 7 or 8 speed chains as that should give you more room for the wider chain on an old bike.
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Old 10-28-10, 10:42 AM   #5
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By 'wiped' I assume you mean 'ruined.'


Yup

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If you are looking for the cheapest possible solution, Dura Ace may not be it.


I have one from other bike upgrade, so the cost isn't a factor. At least not for buying it.

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THe funny thing is, the chainline for modern Dura Ace should be similar to that of an older road bike.


The problem could be the crank I am using to replace it but I don't think so - the spindle on the DuraAce is def shorter than the tapered square end one in the old BB.

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What type of derailleur does the bike have? Is it an old 'piston' style Simplex? Because that is the only thing I can think of that might limit the movement of the front derailleur... provided you have the lower limit screw all the way out, and the derailleur properly aligned.


The lower limit screw is as all the way out as it can be without falling out. The derailer bottoms out on the large chainring and doesn't go any closer to the frame so the chain can not drop down to the smaller chainring.

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Anyhoo, since you are using friction shifters, you should be able to replace the old derailleur with a basic modern one without any problem. Look for a less inexpensive model designed for 7 or 8 speed chains as that should give you more room for the wider chain on an old bike.
Right now the cassette is only 6 gears. The original crankset was 2 chainrings like the octalink Ritchey replacement that I am using with the DuraAce BB that was why I mentioned that the problem might be the crankset.

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Old 10-28-10, 10:49 AM   #6
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Yup
I have one from other bike upgrade, so the cost isn't a factor. At least not for buying it.[/FONT]
]The problem could be the crank I am using to replace it but I don't think so - the spindle on the DuraAce is def shorter than the tapered square end one in the old BB.
The lower limit screw is as all the way out as it can be without falling out. The derailer bottoms out on the large chainring and doesn't go any closer to the frame so the chain can not drop down to the smaller chainring.
Right now the cassette is only 6 gears. The original crankset was 2 chainrings like the octalink Ritchey replacement that I am using with the DuraAce BB that was why I mentioned that the problem might be the crankset.
THe Octolink BB will be significantly shorter than an older square taper BB... the cranks are a 'low profile' design and the Octolink interface is shorter than the square interface. But you cannot compare BB lengths without also comparing crank design - one means nothing without the other.

You said the derailleur bottoms out "on the large chainring." is this a true? If so then BB spindle length is not the problem - derailleur setup is.

Also - is the crank you are using a Dura Ace crank? Because it is my understanding that some DUra Ace octolink parts are not compatible with other non-Dura Ace octolink parts.
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Old 10-28-10, 11:34 AM   #7
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- is the crank you are using a Dura Ace crank? Because it is my understanding that some DUra Ace octolink parts are not compatible with other non-Dura Ace octolink parts.
Yes - the crankset is octalink - fits perfectly.


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You said the derailleur bottoms out "on the large chainring." is this a true? If so then BB spindle length is not the problem - derailleur setup is.
OK, any suggestions on what I need to do to correct this?
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Old 10-28-10, 11:52 AM   #8
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Move the derailleur 'UP'
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Old 10-28-10, 12:19 PM   #9
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Move the derailleur 'UP'
I just got off a video call with a colleague from work who also rides - he pointed out that I had not adjusted the tension on the cable.

I placed the derailer in its lowest position as per the shifter - loosened the cable nut until the derailer moved above the small chainring - tightened the nut - and then it worked. After that all I had to do was readjust the high low limiter screws.

Problem solved. Can't wait to get out and try it out!
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