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19-04.-2004, 11:23 AM
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#1 |
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Meaning of front derailer "top-mid min teeth" spec
I have an XTR front der (FD-M950, c. 1998?) that I would like to try
with a 38-48 double crank. However, the specs for this derailer show 12T as the "Top Mid min. teeth diff." Does this mean that the derailer won't work with a 38-48 double crank? I think I've found older posts that indicate people are running with this setup but I'd like to double-check before I start bolting things together. The reason I want to do this is that I have a 'cross frame with a 34.9 seat tube and top-pull routing. I realize I could use a bottom-pull road front der if I could rig a pulley, but I'm not sure I can find a clamp in the right diameter and it looks like I'd have to buy a braze-on road front der + adapter clamp to fit the fat seat tube. All things considered it would probably be easier for me to fit the M950 and use bar end shifters. Thanks in advance, JLS -- |
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19-04.-2004, 12:50 PM
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#2 |
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Re: Meaning of front derailer "top-mid min teeth" spec
On Mon, 19 Apr 2004 02:23:47 +0000, jlscott3 wrote:
> I have an XTR front der (FD-M950, c. 1998?) that I would like to try > with a 38-48 double crank. However, the specs for this derailer show 12T > as the "Top Mid min. teeth diff." Does this mean that the derailer won't > work with a 38-48 double crank? The reason it would not "work" is that the inner plate is considerably lower than the outer plate, so if set up in the standard way, it would rub on the inner chainring. But I see no reason why you can't just set it up a little higher than standard; that is, as if the outer ring were a 50. Then it should work. The larger clearance for the big ring might make it possible to over-shift the front, so be careful to adjust it properly. Other than that there is no reason why it would not work. -- David L. Johnson __o | Enron's slogan: Respect, Communication, Integrity, and _`\(,_ | Excellence. (_)/ (_) | |
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