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R.I.P. DogFriend
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Some Shimano freehubs can be made to work with other hub shells and you may have to use shims to make it work (not bind against the hub shell). I know the 629 hub shell won't work with a 525 or 756 freehub, but the 529 has a different freehub body than any of those.

Not really sure why they have to make so many freehubs that are just different enough to not be interchangeable, but they seem to go out of their way to do it.

I have put a freehub from a FH-M756 on the FH-M525 hubshell (they seem to be a little stronger). The FH-M525 freehub is reported to be a little weak(er).
 

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Make some music
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Discussion Starter · #3 ·
jeffj said:
Not really sure why they have to make so many freehubs that are just different enough to not be interchangeable, but they seem to go out of their way to do it.
Probably Marketing.

Great info! Thanks!
 

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Their freehubs used to be a lot more interchangeable because all their hubs were built around the same axle type and the same basic design of the engagement mechanism, the differences between models were mostly just in the materials, quality, bearings, etc. However in recent years Shimano started improving some of those fundamental parts of their newer hubs.

The M775 rolls on a stiffer, larger diameter aluminum axle, which older freehubs won't fit over, and has more points of engagement, which makes the half of the engagement mechanism in the older freehubs incompatible with the half of the engagement mechanism in the hub itself.

The M629 has the better engagement mechanism of the M775 but still uses the original steel axle design

The M529 has a version of the old engagement design that is beefed up for low gearing and still uses the original steel axle design too. I'm curious if this one is cross-compatible with their older designs (M525, M576) because the axle is the same and the engagement mech is based on the same design
 

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M756 freehub body on a 525 hub

Has anyone tried this transplant idea? I am wanting to try an M576 XT level free hub body on the existing M525 hub.

Mikey
 

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Durability of m756 vs m525 freehubs?

About a month and a half ago I was having issues with my rear hub and took it into the LBS. The freehub was trashed and the cups were scored so the hub was basically done. I was short on time before a weekend trip to Pisgah, so I got a cheap Alex rim with a Deore M525 hub. The LBS told be this hub would be an upgrade from the stock Joytech hub I had. I mounted the wheel up and took it for a ride. The first steep climb I hit trashed the freehub. The shop fixed it up, but I don't want to risk wasting any more rides with a weak freehub. According to this and other threads the XT level M756 freehub fits my M525 and is more durable (more points of engagement?). I asked the LBS about this and was told that the freehubs are the same and that the XT is no more durable. Which is right?
 

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Former Bike Wrench
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About a month and a half ago I was having issues with my rear hub and took it into the LBS. The freehub was trashed and the cups were scored so the hub was basically done. I was short on time before a weekend trip to Pisgah, so I got a cheap Alex rim with a Deore M525 hub. The LBS told be this hub would be an upgrade from the stock Joytech hub I had. I mounted the wheel up and took it for a ride. The first steep climb I hit trashed the freehub. The shop fixed it up, but I don't want to risk wasting any more rides with a weak freehub. According to this and other threads the XT level M756 freehub fits my M525 and is more durable (more points of engagement?). I asked the LBS about this and was told that the freehubs are the same and that the XT is no more durable. Which is right?
Well they are not the same...just look at the parts numbers

M525 uses the same freehub body as Alivio MC-18 and M510 hubs. It is 16 poe.
Mfg #: Y3A398020

M756 uses the same freehub body as LX M570 and Deore M555 hubs. It is 18 poe.
Mfg #: Y3BD98010
 

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Trying to be helpful
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I know this is an old thread, but I wanted to update with my findings. I recently had my M525 freehub take a [email protected], so I did some research and found the M529 freehub is the same across a selection of Shimano hubs that are also cross compatible with the 525. So I ordered up the, Y-3SW98050 Complete freewheel body unit. (contains Y-3SW98060 freewheel, freewheel washer, Seal Ring and Body Fixing Bolt)

Got it this evening, mounted it up and it works awesome (so far), even feels like the engagement is much better.

Edit: Also thought I should mention, I had to order the part from Universal Cycles as my LBS could not get parts from Shimano, did not have any currently and had no ETA on when/if they will.
 

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Is it 32 poe? I thought shimano doesnt have a 32 poe 6 bolt hub, but a CRC lists the 529 as 32 poe.

Also, the 665 freehub doesnt fit 525 hubs.
 

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Is it 32 poe? I thought shimano doesnt have a 32 poe 6 bolt hub, but a CRC lists the 529 as 32 poe.

Also, the 665 freehub doesnt fit 525 hubs.
I honestly wouldnt know how to tell, but it def feels like it engages much faster than the stock 525 freewheel.
 

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Looking at 2012 Tech Docs, it appears that Shimano has made the M529 available with the 32pt freehub body from the M629/M665
Are the part #s the same, because on all the Shimano tech docs Ive seen, they are different. This is what I came up with..

M665 - Y-3D3 98080

M529 - Y-3SW98060

from my understanding they are not x-compatible.
 

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Shimano introducers 29er-specific hubs | Bike Magic Some useful info in this thread & here is more info. FYI, 3 months after I started pulling a pedicab w/ my 29er equipped with a Formula hub, I blew that out. Since I was unable to replace the freehub for the Formula and no LBS is able to get Formula hubs, I was forced to go down the road of building a wheel with a Deore hub. Within a month, I blew four freehubs, one of which was an XT, which was in pieces when it was taken off the bike. No difference. I went to a Chris King CLassic and later Universal, which was upgraded to a Heavy Duty ISO with thru axle... No problems with the Chris King, except that the cassette chews through aluminum and even the steel (I have to use a screwdriver between the cassette and the hub and twist to get it off). I haven't found a cassette in 12-36, which is ideal for pedicabbing that has a solid mating point with the freehub body, but I wish that they had one. In fact, a 12-36 needs it more than any other... My back up wheel is also a Chris King, both of which I picked up for cheap on ebay...
 

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So what's the verdict? Which freewheel hub do people prefer to swap the stock M525 freehub? M756 or the M529? It sounds like the 529 has almost twice the POE of the 756. Does this mean the 529 will engage quicker? Also any difference in quality between the two?
 

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Hate to have a conversation with myself but did some research and found out that the M529 has 16 POE. Apparently there was an early run of the M529's that had 32 POE. They are now impossible to find. I opted to go with the M756 instead as it supposedly has 18 POE which should be a couple more than the current M525. I'll report back once I get it installed/tested.

So what's the verdict? Which freewheel hub do people prefer to swap the stock M525 freehub? M756 or the M529? It sounds like the 529 has almost twice the POE of the 756. Does this mean the 529 will engage quicker? Also any difference in quality between the two?
 

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Ok, so I went with the m756 FH as mentioned above to transplant onto my m525 hub. The m756 definitely has 16 POE (16 clicks) not 18 and doesn't feel like it engages any faster. It is however MUCH quieter than the stock M525 FH. So much that while coasting, you can't hear the clicks at all. Pretty cool. I'm assuming this FH is better quality and if anything will last longer than the m525 would have lasted.

Oh, one last thing, you'll need reuse the metal washer that seperates the FH from the hub or you can buy a new one. The m756 FH does not come with this washer.
 
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