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Swapping Shimano 8/9/10 freehubs

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Swapping Shimano 8/9/10 freehubs

Old 07-20-20, 10:56 AM
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Alexrims
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Swapping Shimano 8/9/10 freehubs

I need to replace a Shimano freehub on Altus 3x8 drivetrain with V-brakes, but I cannot find the recommended FH-RM70 or FH-RM30-8 models. Could I use another freehub, such as from Deore groupset, for disk brakes, or for 9 speeds, e.g. FH-M475, FH-RM33, or FH-RM66? Is it right that all Shimano 8/9/10 speed freehubs are interchangeable?
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Old 07-20-20, 11:58 AM
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I have that to be so.
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Old 07-20-20, 12:49 PM
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Bill Kapaun
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There are some exceptions, but generally, it's the SAME FH BODY.
9 speed cogs & spacers are thinner than 8.
10 speed are thinner than 9.
https://www.sheldonbrown.com/cribsheet-spacing.html
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Old 07-20-20, 01:26 PM
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There are exceptions. The one thing Iím not sure about are the cones being interchangeable. If Iím not sure, I tend to buy a complete freehub and use the DS cone that came with the freehub body.

The issue is getting the freehub body off the freehub without being laced to a rim.

John
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Old 07-20-20, 01:49 PM
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I kind of misunderstood your question.
Older hubs have a different spline pattern than "newer" hubs, so they won't swap.
Look at the 2 attached pdf's. M475 is real old....UniGlide cogs. (EDIT- I was thinking I had an M-475 when it was an M-450)
Attached Files
File Type: pdf
FH-M475.PDF (857.6 KB, 6 views)
File Type: pdf
FH-RM33-3650.pdf (246.2 KB, 2 views)

Last edited by Bill Kapaun; 07-20-20 at 02:00 PM.
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Old 07-20-20, 02:04 PM
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Originally Posted by Alexrims View Post
Is it right that all Shimano 8/9/10 speed freehubs are interchangeable?
No.
Most Shimano freehubs have a splined recess that goes over a splined nub protruding from the hub.
But SOME have a low star shape protruding from the f/h that fits into a shallow recess in the hub instead.
These donít interchange.
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