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#11
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"daveornee" wrote in message ... Is is practical to put new cogs on an old DURA ACE 7 speed MF7400 freewheel? David: go into a bike store and buy a few Shimano HG22 freewheels. $15 each. Here is an example: http://bethelcycle.com/site/page.cfm...=65&SKU=FW8125 Put it a vise. Crack the lockring with a punch or flat blade screwdriver - its a standard right-hand thread. Take off the Upper 5 cogs and throw away everything else - do not use the new spacers. Use these to replace the upper 5 cogs on your Dura-Ace 7400 freewheel. Since these cogs are Hyperglide and each cog is oriented in a specific position relative to the other, be careful how you align these on re-installation. BTW: one of the 13 or so splines on each of these cogs needs to be filed to make it fit on the Dura-Ace body. A few minutes with a flat file will fix that. On the upside, since the new cogs are Hyperglide, they will shift much better than the originals. |
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#12
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On Sat, 28 Aug 2004 05:13:46 +1000, daveornee
wrote: Is is practical to put new cogs on an old DURA ACE 7 speed MF7400 freewheel? I have an old DURA ACE 7 speed MF7400 freewheel with some broken and bent teeth. The freewheel seems to function fine, but it is worthless with it's current cogs. I know the days are gone when you walked into a bicycle shop and they had a board full of different cogs. However, I still have a couple of good freewheel wheels and a couple of MF7400 DURA ACE freewheels that seem to work well and last a long time. Anywhere to go with an old DURA ACE 7 speed MF7400 freewheel to get new cogs? I would like something like 13 - 26. Ideas beyond doorstop or boat anchor? Before you go shopping, try getting the old sprockets off the used body; I've tried with mine, and snapped the chain on my chain whip without moving the sprocket! This may partially explain the industry's move to cassette hubs, where the pedalling torque DOESN'T keep tightening the sprocket/freewheel threads to the point where you need a 600lb gorilla of a mechanic to change ratios. The MF7400 is widely regarded as the pinnacle of multiple freewheel design, but I fear it is now the pinnacle of paperweight design. Kinky Cowboy* *Batteries not included May contain traces of nuts Your milage may vary |
#13
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On Sat, 28 Aug 2004 05:13:46 +1000, daveornee
wrote: Is is practical to put new cogs on an old DURA ACE 7 speed MF7400 freewheel? I have an old DURA ACE 7 speed MF7400 freewheel with some broken and bent teeth. The freewheel seems to function fine, but it is worthless with it's current cogs. I know the days are gone when you walked into a bicycle shop and they had a board full of different cogs. However, I still have a couple of good freewheel wheels and a couple of MF7400 DURA ACE freewheels that seem to work well and last a long time. Anywhere to go with an old DURA ACE 7 speed MF7400 freewheel to get new cogs? I would like something like 13 - 26. Ideas beyond doorstop or boat anchor? Before you go shopping, try getting the old sprockets off the used body; I've tried with mine, and snapped the chain on my chain whip without moving the sprocket! This may partially explain the industry's move to cassette hubs, where the pedalling torque DOESN'T keep tightening the sprocket/freewheel threads to the point where you need a 600lb gorilla of a mechanic to change ratios. The MF7400 is widely regarded as the pinnacle of multiple freewheel design, but I fear it is now the pinnacle of paperweight design. Kinky Cowboy* *Batteries not included May contain traces of nuts Your milage may vary |
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Kinky Cowboy wrote in message ... On Sat, 28 Aug 2004 05:13:46 +1000, daveornee wrote: Is is practical to put new cogs on an old DURA ACE 7 speed MF7400 freewheel? I have an old DURA ACE 7 speed MF7400 freewheel with some broken and bent teeth. The freewheel seems to function fine, but it is worthless with it's current cogs. I know the days are gone when you walked into a bicycle shop and they had a board full of different cogs. However, I still have a couple of good freewheel wheels and a couple of MF7400 DURA ACE freewheels that seem to work well and last a long time. Anywhere to go with an old DURA ACE 7 speed MF7400 freewheel to get new cogs? I would like something like 13 - 26. Ideas beyond doorstop or boat anchor? Before you go shopping, try getting the old sprockets off the used body; I've tried with mine, and snapped the chain on my chain whip without moving the sprocket! This may partially explain the industry's move to cassette hubs, where the pedalling torque DOESN'T keep tightening the sprocket/freewheel threads to the point where you need a 600lb gorilla of a mechanic to change ratios. The MF7400 is widely regarded as the pinnacle of multiple freewheel design, but I fear it is now the pinnacle of paperweight design. Simple, get someone to whack chain on sprocket whilst you operate chain whip. Had to use shock tactics on a 14 yo car wheel bearing after a 6 foot bar would not shift the nut. 3 ft bar and big 'ammer shifted it. Apply torque as normal and whack tool with hammer at nut position. Rarely fails. Trevor |
#15
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Kinky Cowboy wrote in message ... On Sat, 28 Aug 2004 05:13:46 +1000, daveornee wrote: Is is practical to put new cogs on an old DURA ACE 7 speed MF7400 freewheel? I have an old DURA ACE 7 speed MF7400 freewheel with some broken and bent teeth. The freewheel seems to function fine, but it is worthless with it's current cogs. I know the days are gone when you walked into a bicycle shop and they had a board full of different cogs. However, I still have a couple of good freewheel wheels and a couple of MF7400 DURA ACE freewheels that seem to work well and last a long time. Anywhere to go with an old DURA ACE 7 speed MF7400 freewheel to get new cogs? I would like something like 13 - 26. Ideas beyond doorstop or boat anchor? Before you go shopping, try getting the old sprockets off the used body; I've tried with mine, and snapped the chain on my chain whip without moving the sprocket! This may partially explain the industry's move to cassette hubs, where the pedalling torque DOESN'T keep tightening the sprocket/freewheel threads to the point where you need a 600lb gorilla of a mechanic to change ratios. The MF7400 is widely regarded as the pinnacle of multiple freewheel design, but I fear it is now the pinnacle of paperweight design. Simple, get someone to whack chain on sprocket whilst you operate chain whip. Had to use shock tactics on a 14 yo car wheel bearing after a 6 foot bar would not shift the nut. 3 ft bar and big 'ammer shifted it. Apply torque as normal and whack tool with hammer at nut position. Rarely fails. Trevor |
#16
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David: go into a bike store and buy a few Shimano HG22 freewheels. $15
each. Here is an example: http://bethelcycle.com/site/page.cfm...=65&SKU=FW8125 Put it a vise. Crack the lockring with a punch or flat blade screwdriver - its a standard right-hand thread. Take off the Upper 5 cogs and throw away everything else - do not use the new spacers. Use these to replace the upper 5 cogs on your Dura-Ace 7400 freewheel. Since these cogs are Hyperglide and each cog is oriented in a specific position relative to the other, be careful how you align these on re-installation. Dave, Any idea if this will work with other HG cogs, say for example Ultegra? Thanks and regards, Rob |
#17
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"Rob Weinstock" wrote in message om... David: go into a bike store and buy a few Shimano HG22 freewheels. $15 each. Put it a vise. Crack the lockring with a punch or flat blade screwdriver - its a standard right-hand thread. Take off the Upper 5 cogs and throw away everything else - do not use the new spacers. Use these to replace the upper 5 cogs on your Dura-Ace 7400 freewheel. Dave, Any idea if this will work with other HG cogs, say for example Ultegra? Thanks and regards, Rob Rob: I am talking about Shimano Hyperglide *FREEWHEEL* cogs here. Not *CASSETTE* cogs. They look the same in terms of the tooth profiles. However, when you crack the cogsets apart, you will see that the spline pattern on these cogs is completely different. Besides - an Ultegra cassette cogset will cost 3 times what a HG22 freewheel cogset will. |
#18
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Depends on how many cogs you want to replace. I have an old Dura-ac 6-speed freewheel that I still use regularly. I'm still running th original 13T and 14T but all others have been replaced by either buyin brand new from www.loosescrews.com or taking from a damaged FW (cog were fine, body was locked up) I got on eBay for $1 -- Gonzo Bob |
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