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Old 10-12-08, 07:22 AM   #1
cmcanulty
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front derailleur reach

I need a front derailleur that will reach out quite far, the triple derailleur I bought won't get out to large chainring. I have the BB pretty close to crank already, thanks, this is a 1970s mixte frame bike
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Old 10-12-08, 07:24 AM   #2
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Have you backed out the high limit screw all the way?
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Old 10-12-08, 07:31 AM   #3
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I have the BB pretty close to crank already, thanks, this is a 1970s mixte frame bike
Er what?

You meant you have the crank close to the frame ... right?
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Old 10-12-08, 10:31 AM   #4
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Yes limit screws are all the way out, height is correct and crank is about 1/2 to 1/3" from frame But I need the der to reach out to about 60mm from center of BB and it won't swing that far
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Old 10-12-08, 11:10 AM   #5
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I'm thinking that you need a BB with a shorter axle.

How much room is there from the teeth of the rings to the chain stay? There should only be around 1/8 to 1/4 inch. Even at 1/4 inch that's the most it should be.
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Old 10-12-08, 12:41 PM   #6
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Are you sure it's not the shifter limiting the travel of the derailler and not the other way around?
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Old 10-12-08, 03:51 PM   #7
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Seems like chainline (crank) is too far outward. You want the smallest chainring about 1/8" from the chainstays and the end of the crankarm about 1/4". Chainline should be 40-45mm to the middle-chainring C-C from seat-tube. Outer chainring shouldn't be more than 50mm away.
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Old 10-12-08, 03:58 PM   #8
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Originally Posted by BCRider View Post
I'm thinking that you need a BB with a shorter axle.

How much room is there from the teeth of the rings to the chain stay? There should only be around 1/8 to 1/4 inch. Even at 1/4 inch that's the most it should be.
+1, before you buy a new BB, is it installed in the correct position? I reversed one once and took about 15 minutes before I realized the mistake.
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Old 10-12-08, 04:44 PM   #9
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Is the BB axel intended for a trippel crank? If it is made for a singel or doubbel you need to look into that first (as is said before in different words I guesss).

Next thing is the tripple derailleur made for a tripple chainring? Just asking. I am struggeling with the same problems at the moment, on a 81 mixte. Wanted more gears and different gears.

I ended up putting "new" shifters, front derailleur, and rear derailleud, transfered from an older MTB.
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Old 10-12-08, 06:31 PM   #10
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+1 to the above. short end of the axle goes on the non-drive side. of everything is on correct, then check out a new front derailleur. i've delt with many front derailleurs and never wasn't able to get the travel to go far enough when i used the right one.
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Old 10-13-08, 07:32 AM   #11
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I did put new derailleurs for triple front and long cage rear and have friction shifters so I think I need a different front der. Trouble is which one? I bought the triple front der that had the capacity and large ring capability and got this one that doesn't work. Is there a spec I can ask for that would have more swing distance? I think I can only draw in crank about 1/3" before it hits frame.
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