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  1. #1
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    Large Freewheel Cog

    I recently bought a freewheel with a large cog (38 teeth, standard ones have 28) on the low side. The teeth on the cogs are 14-17-22-28-38 as opposed to the standard 14-17-20-24-28, so it should be better for hilly areas such as where I live. Installed it on my 80's Raleigh, but the rear derailer just doesn't seem to be big enough to handle this monster. Do I need a larger derailer? Derailer extension (if there is such an animal)? Or is there some adjustment I can make that I haven't figure out yet?

  2. #2
    Senior Member sydney's Avatar
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    Quote Originally Posted by fritz1255
    I recently bought a freewheel with a large cog (38 teeth, standard ones have 28) on the low side. The teeth on the cogs are 14-17-22-28-38 as opposed to the standard 14-17-20-24-28, so it should be better for hilly areas such as where I live. Installed it on my 80's Raleigh, but the rear derailer just doesn't seem to be big enough to handle this monster. Do I need a larger derailer? Derailer extension (if there is such an animal)? Or is there some adjustment I can make that I haven't figure out yet?
    You have to have a RD that will handle that cog. Some of the old Suntours would. Check with the classic and vintage geeks for the actual models.

  3. #3
    Senior Member nick burns's Avatar
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    Quote Originally Posted by sydney
    You have to have a RD that will handle that cog. Some of the old Suntours would. Check with the classic and vintage geeks for the actual models.
    Suntour AG will handle a 38 tooth cog.

  4. #4
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by nick burns
    Suntour AG will handle a 38 tooth cog.
    Now all that he has to do is to find one.

  5. #5
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by fritz1255
    I recently bought a freewheel with a large cog (38 teeth, standard ones have 28) on the low side. The teeth on the cogs are 14-17-22-28-38 as opposed to the standard 14-17-20-24-28, so it should be better for hilly areas such as where I live. Installed it on my 80's Raleigh, but the rear derailer just doesn't seem to be big enough to handle this monster. Do I need a larger derailer? Derailer extension (if there is such an animal)? Or is there some adjustment I can make that I haven't figure out yet?
    Those AG freewheels had a great range, but humungous jumps. Current Shimano Megarange derailers can generally be made to work as long as there isn't a wide range in front...but if youhad a wide range in front, you probably wouldn't have bought the AG freewheel.

    I recently came upon a NOS stash of these, and expect to receive them soon. We'll be selling them for $39.95 while they last.

    Sheldon "Once Made A 12-38 7-speed Freewheel Using One Of These" Brown
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  6. #6
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    You'll have to excuse my ignorance on this one, but can the Shimano derailleurs you mentioned be mounted on an older bicycle where the rear derailleur has a "foot" that goes under the rear axle nut?

  7. #7
    Senior Member sydney's Avatar
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    Quote Originally Posted by fritz1255
    You'll have to excuse my ignorance on this one, but can the Shimano derailleurs you mentioned be mounted on an older bicycle where the rear derailleur has a "foot" that goes under the rear axle nut?
    You need what is called a 'claw adapter'. Shimano calls theirs a hanger plate.

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