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Old 07-28-05, 09:38 AM   #1
fritz1255
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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?
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Old 07-28-05, 09:41 AM   #2
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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.
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Old 07-28-05, 09:49 AM   #3
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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.
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Old 07-28-05, 10:45 AM   #4
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Suntour AG will handle a 38 tooth cog.
Now all that he has to do is to find one.
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Old 07-28-05, 12:03 PM   #5
Sheldon Brown
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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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Old 07-29-05, 05:51 AM   #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?
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Old 07-29-05, 07:14 AM   #7
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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?
You need what is called a 'claw adapter'. Shimano calls theirs a hanger plate.
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