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Freewheel Supply - Any Worries?

Old 07-29-14, 06:10 AM
  #51  
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I second IRD FW's!

Smooth and SUPER quiet.

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Old 07-29-14, 06:28 AM
  #52  
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Originally Posted by SJX426 View Post
This is a crazy idea but I was wondering if an EDM tool could be made to modify cogs.
You just cut off two of the teeth from a 28 and you'd have a 26. I'd recommend cutting off two on opposite sides from each other.
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Old 07-29-14, 06:30 AM
  #53  
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Seriously?
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Old 07-29-14, 06:35 AM
  #54  
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Originally Posted by rootboy View Post
Seriously?
C'mon, RB, don't you recognize a smiley face when you don't see one?
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Old 07-29-14, 06:40 AM
  #55  
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@jimmuller -
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Old 07-29-14, 06:52 AM
  #56  
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Originally Posted by iab View Post
At a cost of at least $150 (for a single cog) for the foreseeable future. 3d printing is most certainly not the manufacturing process to lower costs.
3D is still new tech, one thing that seems to occur with modern tech is each generation gets cheaper, so it's $150 today, 5 years down the road it might be only $15, and 10 years down the road, it might be 15¢ Although realistically a better way to do cogs, might be to stamp cogs with a blank centre, then uses CNC to clean up and cut the centre might work better and be cheaper.
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Old 07-29-14, 07:18 AM
  #57  
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3D is just out of the question in my lifetime. Powder metal has its uses too but very limited, 3D is worse. Tooling for stamping small volumes is out of the question from a cost perspective, even in China. CNC with what? Can't use an end mill to make square corners so it would have to be broaching or a very small second or third operation with a very small radius mill. Most cost effective would be laser or water jet if the later will cut through the thickness of a cog without leaving slag and a rough edge.

Am I missing something? I am not a machinist but have some exposure to manufacturing process and tools. Is there any machinist or industrial engineer out there that can help?
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Old 07-29-14, 07:22 AM
  #58  
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Originally Posted by jimmuller View Post
C'mon, RB, don't you recognize a smiley face when you don't see one?
Usually, yes. Or …no. Or…...
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Old 07-29-14, 09:02 AM
  #59  
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Funny, I had this same thought (the dearth of good freewheels in with ranges I want) on Sunday. I'm almost ready to toss in the towel and switch my McLean to a freehub and indexed gearing. It currently has Campagnolo Nuovo Record derailleurs and hubs. It has a 14-28 Shimano freewheel which is starting to make noise while pedaling. I think the chain isn't meshing well with the teeth on the freewheel. I'd like a higher top gear, i.e. 13T smallest cog. The 28T cog makes noise because I'm pushing the limit of the RD, resulting in the pulley, chain, and cog all being squashed together. So ideally, I'd like a 13-26 7-speed freewheel. Do they exist? I would settle for a 6-speed, I suppose.
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Old 07-29-14, 09:05 AM
  #60  
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Originally Posted by SJX426 View Post
3D is just out of the question in my lifetime. Powder metal has its uses too but very limited, 3D is worse. Tooling for stamping small volumes is out of the question from a cost perspective, even in China. CNC with what? Can't use an end mill to make square corners so it would have to be broaching or a very small second or third operation with a very small radius mill. Most cost effective would be laser or water jet if the later will cut through the thickness of a cog without leaving slag and a rough edge.

Am I missing something? I am not a machinist but have some exposure to manufacturing process and tools. Is there any machinist or industrial engineer out there that can help?
I am an aerospace engineer. You are fine. For high strength metal needs to have a crystal structure. For this it needs to be worked (forged, rolled) and/or heat treated. The primary application for 3D parts in my business is marketing, and for this they are very, very good. Aerospace companies used to have airbrush artists painting "artist's conceptions" of new products, now it's all CAD and computer animation. The primary technical application is tooling, and that is growing fast as the machines get bigger and faster. But it's a rare thing we send out the door with any 3D printed parts on it.

Looking at a 7-speed cassette I have here, the splines are far from perfect, it's not the most precise thing I've ever seen. The important dimensions to match would be the minor diameter and the edges of the splines. You could probably do it with EDM or water jet. The big problem is the enormous variety of freewheels and limited number of customers.
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Old 07-29-14, 10:22 AM
  #61  
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Originally Posted by noglider View Post
Funny, I had this same thought (the dearth of good freewheels in with ranges I want) on Sunday. I'm almost ready to toss in the towel and switch my McLean to a freehub and indexed gearing. It currently has Campagnolo Nuovo Record derailleurs and hubs. It has a 14-28 Shimano freewheel which is starting to make noise while pedaling. I think the chain isn't meshing well with the teeth on the freewheel. I'd like a higher top gear, i.e. 13T smallest cog. The 28T cog makes noise because I'm pushing the limit of the RD, resulting in the pulley, chain, and cog all being squashed together. So ideally, I'd like a 13-26 7-speed freewheel. Do they exist? I would settle for a 6-speed, I suppose.
If you can maintain enough fitness, you ought to be happy with the Sunrace 13-25t 7-speed freewheels. I can still push a 39-25t low gear up anything around here if my legs are still working at such a point during the ride where the road heads vertical.
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Old 07-29-14, 10:25 AM
  #62  
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Originally Posted by dddd View Post
If you can maintain enough fitness, you ought to be happy with the Sunrace 13-25t 7-speed freewheels. I can still push a 39-25t low gear up anything around here if my legs are still working at such a point during the ride where the road heads vertical.
Oh, there I go. Perfect. Thanks!
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Old 07-29-14, 10:25 AM
  #63  
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Originally Posted by noglider View Post
Funny, I had this same thought (the dearth of good freewheels in with ranges I want) on Sunday. I'm almost ready to toss in the towel and switch my McLean to a freehub and indexed gearing. It currently has Campagnolo Nuovo Record derailleurs and hubs. It has a 14-28 Shimano freewheel which is starting to make noise while pedaling. I think the chain isn't meshing well with the teeth on the freewheel. I'd like a higher top gear, i.e. 13T smallest cog. The 28T cog makes noise because I'm pushing the limit of the RD, resulting in the pulley, chain, and cog all being squashed together. So ideally, I'd like a 13-26 7-speed freewheel. Do they exist? I would settle for a 6-speed, I suppose.
Come to the dark side... you know you want to.

Shimano HG50 7-Speed Cassette - 13-26T, Silver
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Old 07-29-14, 10:30 AM
  #64  
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Originally Posted by ThermionicScott View Post
Come to the dark side... you know you want to.

Shimano HG50 7-Speed Cassette - 13-26T, Silver
As I said, I do want to, and I just might do it. I have a Tiagra drivetrain sitting around, barely used. I bought it from another BF member. I know it would be unaesthetic, to say the least, to put it on my McLean, but I think it would improve my enjoyment of the bike.
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Old 07-29-14, 10:35 AM
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Old 07-29-14, 11:17 AM
  #66  
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At least your bike doesn't have a french-threaded freewheel like my Peugeot
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Old 07-29-14, 11:24 AM
  #67  
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If I only had an extra $10k in my change drawer….
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Old 07-29-14, 12:04 PM
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I did it again. Just bought an Italian-threaded 15t-25t Everest FW for $16. My resistance to buying superfluous bike parts is futile. Between the 10 or so that are installed and about a dozen spares, I think I'm good on FWs for at least the next decade.

Originally Posted by jyl View Post
Now you're just rubbing it in.
Guilty as charged!
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Old 07-29-14, 12:41 PM
  #69  
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Originally Posted by Armacham View Post
At least your bike doesn't have a french-threaded freewheel like my Peugeot
Yellow Jersey lists a limited number of French threaded freewheels. Buy now before they're all snapped up!
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Old 07-29-14, 02:17 PM
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@Darth Lefty - Thanks! I sold CAD/CAM/CAE SW for a short period of time and we were using and selling 3D machines back in mid 90's. Great for marketing, no good for usable parts.

So what is the most popular freewheel hub that would be a candidate as a "standard" for modified freehub cogs?
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Old 07-29-14, 03:04 PM
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Originally Posted by noglider View Post
As I said, I do want to, and I just might do it. I have a Tiagra drivetrain sitting around, barely used. I bought it from another BF member. I know it would be unaesthetic, to say the least, to put it on my McLean, but I think it would improve my enjoyment of the bike.
Looking fabulous trumps function, you know that.
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Old 07-29-14, 03:36 PM
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Originally Posted by gaucho777 View Post
My resistance to buying superfluous bike parts is futile. Between the 10 or so that are installed and about a dozen spares, I think I'm good on FWs for at least the next decade.
That sounds familiar. There's the old saying, "The man who dies with the most toys wins."
Always hated that saying. The man who dies with the most toys…is dead.

But, in the mean time
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Old 07-29-14, 05:18 PM
  #73  
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Originally Posted by Armacham View Post
At least your bike doesn't have a french-threaded freewheel like my Peugeot
Even more of an argument for servicing, maintaining and cleaning your freewheel on an annual basis.

What brand freewheel and what range? The reason I ask is if the internals are maintained, the cogs can potentially be replaced.
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Old 07-29-14, 05:23 PM
  #74  
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Seems to me that there's a future reserve of mid/wide range 7 spd. freewheels on all the Kent bikes etc. being pumped through the big box stores these past years. Not high end, I know, but they seem to function, at any rate, and sport modern, twisted tooth design.
I have one in use, giving good service, and one removed due to non-preferred gearing, in my stash somewhere.
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Old 07-29-14, 05:35 PM
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Originally Posted by elcraft View Post
Yellow Jersey lists a limited number of French threaded freewheels. Buy now before they're all snapped up!
Actually just emailed them and they said they are all out.

Originally Posted by pastorbobnlnh View Post
Even more of an argument for servicing, maintaining and cleaning your freewheel on an annual basis.

What brand freewheel and what range? The reason I ask is if the internals are maintained, the cogs can potentially be replaced.
Yep, I'm planning to stay on top of that. It's an Atom 77 6 speed. I believe it's 13-24, but I'll have to double check when I get home. I figure worst case scenario, I can get an english threaded one and transfer over the cogs.
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