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shimano free hub replacement?

Old 08-12-19, 09:21 PM
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spectastic
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shimano free hub replacement?

I bought a used wheelset that has shimano deore fh-mt525 rear hub. I noticed there was play in the free hub. Greasing the bearings did not help, so it appears the free hub body needs to be replaced, unless there's an adjustment I'm missing. They do sell m525 free hub bodies for pretty cheap, but I'm wondering if there are better alternatives out there that would fit on there.
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Old 08-12-19, 09:27 PM
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Is the cassette body loose on the hub, or does it somehow have loose bearing in the freewheel part?
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Old 08-12-19, 09:47 PM
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Shimano likely has a "higher grade" unit that will fit the hubshell interface, they've used the same lobed design for many decades. But one challenge with replacing freehub bodies with non spec ones is the resulting changes to the RH axle bearing location, it's sealing design and how to blend the new and old to end up with a working set up. It's not uncommon to need to change the RH cone and/or spacers to do this.

Regardless of the grade of the freehub body it will wear and, if used and maintained as before, have much the same expected life span. Why? Because the wear/stressed parts will still be steel as before. Andy
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Old 08-13-19, 01:46 AM
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Originally Posted by Kimmo View Post
Is the cassette body loose on the hub, or does it somehow have loose bearing in the freewheel part?
idk, but the hub bearings are well greased and properly tightened. but there's still some lateral play in the cassette. it likely won't affect shifting very much in the bike i'm running, but still something i'll have to address one of these days.
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Old 08-13-19, 01:48 AM
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Originally Posted by Andrew R Stewart View Post
Shimano likely has a "higher grade" unit that will fit the hubshell interface, they've used the same lobed design for many decades. But one challenge with replacing freehub bodies with non spec ones is the resulting changes to the RH axle bearing location, it's sealing design and how to blend the new and old to end up with a working set up. It's not uncommon to need to change the RH cone and/or spacers to do this.

Regardless of the grade of the freehub body it will wear and, if used and maintained as before, have much the same expected life span. Why? Because the wear/stressed parts will still be steel as before. Andy
replacement in kind would be the easiest thing to do. I'm just wondering if later deore designs are compatible with the m525, assuming that the engineering of the free hubs in the alter designs are better and make them longer lasting.
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Old 08-13-19, 01:57 AM
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I've used a variety of Shimano freehubs.

As far as I can tell, the bearing races are good in all of their freehubs.

I haven't had any issues with the freehub internals.

Pretty much any 8/9/10 speed Shimano freehub should fit. Don't get 11 or 12 speed.
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Old 08-13-19, 10:09 AM
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I've taken apart standard 7 and 8 speed freehubs and a Titanium one. There is almost no discernable difference.
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Old 08-13-19, 03:36 PM
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Originally Posted by spectastic View Post
idk, but the hub bearings are well greased and properly tightened. but there's still some lateral play in the cassette. it likely won't affect shifting very much in the bike i'm running, but still something i'll have to address one of these days.
Yeah well, you want to find out... It's more likely the cassette body is loose on the hub, which is an easy fix, but you better get into it before the hub is destroyed.

If it's play in the cassette body itself, it is possible to disassemble it and remove a shim or two, but you need to make a tool to engage the slots in the bearing cup.
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Old 08-13-19, 04:04 PM
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How much play, in mm?
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