Large Freewheel Cog
07-28-05, 09:38 AM
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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?
07-28-05, 09:41 AM
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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?
07-28-05, 09:49 AM
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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.
07-28-05, 10:45 AM
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Originally Posted by nick burns
Suntour AG will handle a 38 tooth cog.
07-28-05, 12:03 PM
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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?
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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+------------------------------------------+ | To invent, you need a good imagination | | and a pile of junk. --Thomas Edison | +------------------------------------------+
07-29-05, 05:51 AM
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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?
07-29-05, 07:14 AM
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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?
