Q about freehub bodies

John Forrest Tomlinson said:

Can I fit a Shimano RX100 8 speed freehub body onto an Ultegra 6400
hub? What about onto an Ultegra 6410 hub?

Except for Dura-Ace 6, 7, 8 and 10 speed hubs, freehub bodies for all
generations and models of Shimano cassette hubs are interchangeable.
For best results when mixing freehub and hubshell models, I encourage
you to also match the RH cone, locknut and any spacers to its
corresponding freehub body. By so doing, you ensure that the cone's
seal matches the type of dustcap on the freehub body and that the
distance from the outside of the right locknut to the freehub body is
appropriate.

Quoted message said:

What about onto an Ultegra 6410 hub?

I don't think there was a 6410 hub model. If this was a typo and meant
to be 6401, it's covered in the paragraph above.

Quoted message said:

Is there a quality difference between an RX100 freehub body and
Ultegra freehub bodies?

They're not exactly the same, but I doubt you'd perceive any
difference in use.
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John Dacey
Business Cycles, Miami, Florida
Since 1983
Our catalogue of track equipment: online since 1996.
http://www.businesscycles.com