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Shimano SLX FH-M678 Cassette Freehub Body - Y3TL98040

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Questions & Answers (3) Q & A
For use with Shimano SLX FH-M678 rear hubs.

This Cassette Freehub Body can also be used on the following rear hubs:

- Shimano Saint FH-M828
- Shimano Deore XT FH-M788
- Shimano ZEE FH-M648
- Shimano Deore FH-M618
- Shimano WH-MT68-R12
- Shimano WH-MT66-R12-29

These are an "A" match which indicates that the parts are the same in materials, appearance, finish & size etc.

If the correct Cassette Freehub Body is unavailable you can also use the freehub body from the following rear hub:

- Shimano Deore XT FH-M778

This is a "B" match which indicates that the parts are usable, but differ in materials, appearance, finish & size etc.

Genuine Shimano replacement part.
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Questions & Answers (3)
07 Aug 2016
Along the lines of the other question, is this freehub body made from the same material as the original? And can you confirm this is actually a different model to the original which is unreliable.
SJS Customer Service:
Hi, unfortunately there is no way for us to check what the original material of the freehub was as Shimano do not list this sort of information. Our current stock arrived with us recently however we have stocked this freehub since 2013 & have yet to have one returned through a failure.

Please Could You Let Me Know How The Freehub Body Is Seperated From The Shimano Hub (Fh-M678).
22 Jul 2016
Most freehubs use a 10mm allen key but this doesn't seem to
SJS Customer Service:
Hi, this particular freehub requires a 15mm allen key for removal. The Shimano part is TL-FH15 & our part number is 33564 on the website. Regards
Is This The New Replacemtent Freehub?
26 Apr 2015
The original freehub was prone to cracking and Shimano reportedly updated it with a new material and/or heat treatment process. Is this the updated replacement or the original version. Thank you.
SJS Customer Service:

This is the newest and most up to date version available from Shimano.