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Old 03-15-14, 07:08 AM   #1
Seweryn
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Shimano Dura Ace 7700 Rear Hub Axle - Steel or Alloy?

Hi Guys,

I have two rear hubs of the 7700-series and I was servicing one today and discovered that the axle is Cr-Mo steel, but I was quite sure it is aluminium axle on the other one. I know front is alloy, but what axle was normally in these hubs when leaving factory?

Thank you.
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Old 03-15-14, 12:48 PM   #2
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All 7700 freehubs came with steel axles.

The same-vintage XTR freehub used titanium, but this required looser bearing adjustment for when the QR was secured, compressing the ti axle.

An aluminum axle would require even looser bearing adjustment, for the same reason.
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Old 03-15-14, 01:19 PM   #3
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Quote:
Originally Posted by dddd View Post
All 7700 freehubs came with steel axles.

The same-vintage XTR freehub used titanium, but this required looser bearing adjustment for when the QR was secured, compressing the ti axle.

An aluminum axle would require even looser bearing adjustment, for the same reason.
Thank you, that is great info.
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Old 03-15-14, 09:05 PM   #4
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A lot of folks with the 7700 swapped in Ti axles; it was pretty much SOP among my group. A couple learned about the Ti flex/QR issue the hard way.
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