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Shimano Freehub Internals - Specialist Query?

676 Views 8 Replies 6 Participants Last post by kiatkiat, Jun 25, 2009

billyboy197

Discussion Starter · Jun 23, 2009 (Edited)

Sorry - Another Specific Question....

Does anyone know what the difference is between the internals of a basic Shimano Deore freehub and the 'superior' XT freehub?

I have opened up my Deore freehub ('cos I like doing that kind of thing :thumbsup: ) and have found that one of the pawls/dogs has shattered. Are the pawls of an XT made differently or of a different material? Do you get more pawls (there are only 2 in the Deore)? What do you get for your extra XT money?

Information appreciated from the techs amongst you...

By the way - I know you can't buy spare pawls - I'm just interested.

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mechBgon

· #2 · Jun 23, 2009

The latest generation of XT freehubs are a major departure from the preceeding versions, as you'll see if you compare exploded views. For your extra money, you get oversized aluminum axles, lower weight, and finer engagement on the freehub.

In the older-generation XTs, the XT model had additional bearing seals and shields compared to Deore, for one thing. I don't know if there were any differences in the pawls themselves or not.

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4JawChuck

· #3 · Jun 24, 2009

The freehub is replaceable, the XT version is $4 more over the Deore and interchanges completely. Internally they are the same, the XT stuff is constructed of lighter materials with hardened sleeved bearing races so the bearings last longer...XTR is titanium. The pawls are made of powder press steel matrix and are common to all the Shimano freehubs...they are not replaceable because once they shatter all the hard powder press particles gets into the bearings and trash the races.

My advice, spend the extra $4.:thumbsup:

http://www.jensonusa.com/store/product/HU408Z13-Shimano+9+Speed+Hg+Freehub+Body.aspx

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billyboy197

Discussion Starter · #4 · Jun 24, 2009

Thanks for the knowledge. I've never had a pawl fail before but I do have a few old Shimano freehubs in my box-of-bits so I'll see if I can canabalise a pawl. It should keep me going a while longer as this freehub is only 3 months old so all the wear parts are fine. After all - that's what the box-of-bits is for! :thumbsup: I'll get an XT next time.

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Bikinfoolferlife

· #5 · Jun 24, 2009

If any of those old freehub bodies were functional, it'd probably be easier to just use one than take one apart and get it back together (good luck with the dust cover). If it's only three months old and failed in normal use try warranty.

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kiatkiat

· #6 · Jun 25, 2009

I just broke my XTR (975) axle shaft.

I looking for replacement axle. Can I just take my old XTR (950) axle apart and use its axle?

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Slurry

· #7 · Jun 25, 2009

I'm also wondering about engagement points on shimano freehubs, because i've heard that most shimano freehubs have 24 "points" of engagement, but on any hub i've ever seen, there were only 16 "clicks" per revolution.

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mechBgon

· #8 · Jun 25, 2009

kiatkiat said:
I just broke my XTR (975) axle shaft.

I looking for replacement axle. Can I just take my old XTR (950) axle apart and use its axle?

No, because the old axle is the traditional design, but the XTR 970-series use a new design, an oversized aluminum axle. XTR comes with a 3-year warranty, if I remember correctly, so you should be able to get it covered under warranty.

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kiatkiat

· #9 · Jun 25, 2009

mechBgon said:
No, because the old axle is the traditional design, but the XTR 970-series use a new design, an oversized aluminum axle. XTR comes with a 3-year warranty, if I remember correctly, so you should be able to get it covered under warranty.

Hi, the bad news is the hub is a 2nd-handed, so wan't covered.

So I guess only a XT axle will worked???

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