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Shimano 10 speed triple to double crankset?

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Shimano 10 speed triple to double crankset?

Old 08-04-06, 07:21 PM
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irablumberg
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Shimano 10 speed triple to double crankset?

I currently have a tandem with a Shimano 10 speed drive train (but FSA cranks). The crank is a triple and I'd like to try a compact double instead. One bike mechanic I consulted said that the chain ring spacing between the rings on a double is different than on a triple on the new Shimano 10 speed stuff. Thus, I'd need a new front brake/shift lever. If that is the case, I will forget the idea as it is not worth that level of expense and hassle. On the other hand, if I can use my existing triple front shift lever and simply have it shift between a big and a small ring, I will try the experiment.

All insights appreciated.

Also, I was under the impression that I could use the same bottom bracket as the big ring on a compact double would simply be in the same spot as the big ring on the existing triple, so chain line issues wouldn't arise. Is this incorrect?

TIA,
Ira
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Old 08-04-06, 07:32 PM
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mayukawa
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Considering that my Shimano 105 10sp shifters are both double and triple compatible (it's basically a triple shifter where I lock out the 3rd click), I find that hard to believe... I'm using it with the Shimano compact BTW. The FD will need to be changed out though...but of course that's much cheaper than the STI lever.
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Old 08-04-06, 08:15 PM
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irablumberg
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Good point, thanks. I looked at the Shimano site, but only looked at Dura Ace and Ultegra components which shed no light on the issue. Since it does appear that all the 10 speed 105 levers are both double and triple compatible, it looks like there should be little or no difference in chainring spacing.

I think I'll give this a try.

Ira
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Old 08-04-06, 09:22 PM
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Originally Posted by irablumberg
I currently have a tandem with a Shimano 10 speed drive train (but FSA cranks). The crank is a triple and I'd like to try a compact double instead. One bike mechanic I consulted said that the chain ring spacing between the rings on a double is different than on a triple on the new Shimano 10 speed stuff.
In an attempt to invoke the spirit of sydney, I say that mechanic is a carpet-smoking muppet. The spacing is the same. If you have a shifter that works for a triple, it will also work for a double (compact or otherwise). You basically set the limit screws on the FD to work with the 2 rings which will disallow shifting into the 3rd position of the shifter.


Also, I was under the impression that I could use the same bottom bracket as the big ring on a compact double would simply be in the same spot as the big ring on the existing triple, so chain line issues wouldn't arise. Is this incorrect?
You will probably want a new BB appropriate to the double width.You can probably make it function with the existing triple, but chainline will be an issue.
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