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Shimano 600 Freewheel FW-6208 cog compatibility?

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Shimano 600 Freewheel FW-6208 cog compatibility?

Old 05-31-17, 08:11 PM
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frantik
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Shimano 600 Freewheel MF-6208 cog compatibility?

I have a Shimano 600 freewheel with some cogs that are getting worn. Are there any options for swapping out the cogs with other Shimano freewheels, perhaps older 6 speed MF-HG20 freewheels which are in bigger supply (and are also hyperglide to boot) ? I know the freewheel can be disasembled down to a plain body that is very similar to a freehub, and the internals of the 600 freewheel are nice, so it would be cool to know of a way to keep it in service

Thanks

Last edited by frantik; 05-31-17 at 10:03 PM.
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Old 05-31-17, 09:07 PM
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Originally Posted by frantik View Post
I have a Shimano 600 freewheel with some cogs that are getting worn. Are there any options for swapping out the cogs with other Shimano freewheels, perhaps older 6 speed FW-HG20 freewheels which are in bigger supply (and are also hyperglide to boot) ? I know the freewheel can be disasembled down to a plain body that is very similar to a freehub, and the internals of the 600 freewheel are nice, so it would be cool to know of a way to keep it in service

Thanks
The MF-6208, MF-7400, and MF-Z012 all used a threaded outer cog (or two on the 7 speed MF-7400), and two different sizes of splined cogs for the other positions. They vary as to finish, and possibly material quality, but are fully interchangable between each other. I'm pretty sure the newer hyperglide freewheel cogs will fit, but you will need to grind down the one wide spline.
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Old 05-31-17, 10:05 PM
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Originally Posted by cdmurphy View Post
The MF-6208, MF-7400, and MF-Z012 all used a threaded outer cog (or two on the 7 speed MF-7400), and two different sizes of splined cogs for the other positions. They vary as to finish, and possibly material quality, but are fully interchangable between each other. I'm pretty sure the newer hyperglide freewheel cogs will fit, but you will need to grind down the one wide spline.
Awesome, this is exactly what I needed to know. So the HG freewheels had a larger spline similar to the freehubs huh? I wish the freehub cogs would fit the freewheel
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Old 06-01-17, 06:12 AM
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I dont believe the cogs on the MF-TZ20 are interchangable with those you mention. At a minimum the larger cogs are riveted together and only one has a spline. The body (as I recall it) is totally different than the MF-6208. I had one and was thinking the same thing, somI took it apart.

Otoh, the new ones are nice as they are. I just buy t hose when I need a replacement.

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Old 06-01-17, 08:13 AM
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Originally Posted by jcb3 View Post
Otoh, the new ones are nice as they are. I just buy t hose when I need a replacement.
if they didn't have that giant shimano logo and the painted black cog i would be more inclined to pick up one of their modern freewheels

Last edited by frantik; 06-01-17 at 04:15 PM.
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Old 06-01-17, 03:46 PM
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Originally Posted by frantik View Post
if they didn't have that giant shimano logo and the painted black cog i would be more included to pick up one of their modern freewheels
I painted over the logo with black testors - the chain dies not touch the paint job
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Old 10-12-17, 11:56 AM
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Originally Posted by jcb3 View Post
I painted over the logo with black testors - the chain dies not touch the paint job
Is that what you mean when you say you buy a new one? Something like this: https://www.biketiresdirect.com/prod...BoCPxIQAvD_BwE

As frantik mentioned, is there some way to avoid that horrific black cog, or is painting it really the only option?
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Old 10-12-17, 03:39 PM
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Thats the one

Testors gold would work as well
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Old 10-12-17, 03:42 PM
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The large cog cant be removed. It is riveted to the next one and does not engage the body (is not splined)
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Old 10-12-17, 04:14 PM
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That riveted construction isn't the end of the world. Thanks to it, these new freewheels are much lighter than the ones that came before.
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Old 10-12-17, 07:12 PM
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Originally Posted by jcb3 View Post
I painted over the logo with black testors - the chain dies not touch the paint job
I used a Sharpie...

I'm OK with the black cog, but as you said- there's gold paint as well.
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