Shimano D-A 10 speed hub question

[Bruce K]

The discussion in the Classifieds section about cassette/hub compatibility has me wondering....

Wil you be able to "update" a Dura-Ace 10 speed free hub body from the Shimano 10 speed cassette only body to the new Dura-Ace 10 speed free hub body that will take all Shimano copmpatible cassettes?

It would certainly be a whole lot easier if this can be done.

BK

[dirtdigger88]

wouldn't it be cheaper just to modify the original freehub - rather than buy a new one-

dont they run around $75 or $100 . . .

jason

[Dave]

wouldn't it be cheaper just to modify the original freehub - rather than buy a new one-

dont they run around $75 or $100 . . .

jason

As a former machinist, I don't think so. A 10 speed only cassette body not only has a larger major diameter on the splines, the spline length is shorter. Any 9/10 cassette body will have the old spline design - smaller in major diameter and slightly longer, requiring a shim if used with 10 speed cassettes.

[dvs cycles]

wouldn't it be cheaper just to modify the original freehub - rather than buy a new one-

dont they run around $75 or $100 . . .

jason On the 7800 the freehub body is more like the Mavic and not a complete unit as previous generations.

[dirtdigger88]

I hate to disagree-

oh who am I kidding I LOVE to disagree

I have had all my 7800 free hubs modified to run 9 speed (8 speed too) cassettes

all you do is remove about 1 mm from each spline-

you can say it wont work- but I have 4 sets of wheels to prove other wise

someone with a lathe and some time-

set me back $25 for each

jason

[Dave]

I hate to disagree-

oh who am I kidding I LOVE to disagree

I have had all my 7800 free hubs modified to run 9 speed (8 speed too) cassettes

all you do is remove about 1 mm from each spline-

you can say it wont work- but I have 4 sets of wheels to prove other wise

someone with a lathe and some time-

set me back $25 for each

jason


Turning down the OD is certainly not tough. As long as the smallest cog engages the splines and doesn't protrude enough to cause frame interference, you're good to go. All I'm saying is the splines aren't the normal 9 speed length.

The idea behind the deeper 10 speed spline was to allow the use of an aluminum cassette body with a reduced risk of damaging the splines. Aluminum isn't a great choice for such a shallow spline. That's why Shimano doesn't offer it. I've read plenty of posts complaining about damaged aluminum cassette bodies on off-brand hubs.

Campy made the switch to deeper splined aluminum cassette bodies back in 1997, when 9 speed was introduced.

[dirtdigger88]

have not had a problem in over a year-

I have no gouges in my splines-

besides we were only talking about "if it was possible"

the answer is YES - it is possible

oh and to the OT-

NO you will not be able to switch

jason

[Ti Designs]

I have had all my 7800 free hubs modified to run 9 speed (8 speed too) cassettes

all you do is remove about 1 mm from each spline-

you can say it wont work- but I have 4 sets of wheels to prove other wise

someone with a lathe and some time-

set me back $25 for each



I've modified 3 of 'em myself, I think it can be done...

[39cross]

Wil you be able to "update" a Dura-Ace 10 speed free hub body from the Shimano 10 speed cassette only body to the new Dura-Ace 10 speed free hub body that will take all Shimano copmpatible cassettes?
BKI think I'd email that question to Sheldon Brown. He has a page of DA compatibility I think, don't know if he's updated it.

But why just speculate, here's the link: DA Compatibility (http://www.sheldonbrown.com/dura-ace.html#10) . I don't see it updated.

[PaulE]

Before I bought a new set of wheels. Otherwise I wouldn't know beans about it.

On a Dura Ace 7800 rear hub, the drive side wheel bearings are in the hub shell itself, inboard of the free hub, rather than in the outboard side of the freehub.

Dura Ace 7800 exploded view (http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FH/EV-FH-7800-2252_v1_m56577569830608915.pdf)

I think this is the real reason that Shimano is coming out with the new and improved Dura Ace 7850 which goes back to the hub shell and freehub design used in 9 speed Dura Ace and 10 speed Ultegra - so they can put the drive side wheel bearings outboard.

[Dave]

Before I bought a new set of wheels. Otherwise I wouldn't know beans about it.

On a Dura Ace 7800 rear hub, the drive side wheel bearings are in the hub shell itself, inboard of the free hub, rather than in the outboard side of the freehub.

Dura Ace 7800 exploded view (http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FH/EV-FH-7800-2252_v1_m56577569830608915.pdf)

I think this is the real reason that Shimano is coming out with the new and improved Dura Ace 7850 which goes back to the hub shell and freehub design used in 9 speed Dura Ace and 10 speed Ultegra - so they can put the drive side wheel bearings outboard.

Apparently so.

http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FH/EV-FH-7850-2714_v1_m56577569830621045.pdf