Bunns1

HI, I have a Dura Ace wheel and hub, 2006 rear wheel i think. Any way it is a dura ace free hub, that has been fitted with a 12-25 dura ace cassette. I need to attach a 14-25 cassette to it, however, i have an Ultegra 14-25 but it wont seem to fit. I have been told that dura ace free hubs, wont accept any other cassette other than a dura ace. IS it at all possible that i can fit the ultegra cassette onto this wheel??

Thanks

bdcheung

For a short time, freehubs were produced that would only accept Shimano 10-speed cassettes.

Your Ultegra should fit. Are you sure the splines are aligned correctly? There is one narrower spline that you should key up, that will ensure the other splines align correctly with the slots on the cassette.

Bunns1

yeah it is definately lined up properly. just wont go on, it just sits on the top, but wont slip all the way down :S really annoying

kimconyc

https://www.spadout.com/p/shimano-cs-...egra-cassette/
Your cassette is not compatible.

FWIW, I have an older DA 7800 freehub (aluminum, tall splines) and have used a 6600 11-23 cassette on it fine. So while the freehub is not DA exclusive, you can't use a junior gear cassette with the freehub according to the link i posted.

kimconyc

Also, in the future, you will probably get better answers for these type of questions in the mechanics forum. FYI.

bdcheung

Wow, I can't believe that only certain combinations aren't compatible.

Tough luck, OP.

Bunns1

do you think this freehub body will fit my hub?? meaning i could run the ultegra 14-25 cassette??

Bunns1

woops forgot the link https://www.wiggle.co.uk/p/cycle/7/Sh...dy/5360023703/

ls01

From what I have researched in the past Shimano did produce a d/a only hub. I read about them a while back when I was looking at some clusters on flea bay. the d/a only have a taller spline and are layed out differently if I remember correctly. I will try to find the info but am limited in time currently.

Edit: sorry bunns I was wrong the only limitation is that you must use a 10 speed cassete with the d/a hub due to the height of the splines on the aluminum hub. So its actually a 10 speeed only hub.

Are you sure its a 10 speed cassette?

rydaddy

It won't work.

Mavic M10 Kit No. 4 is the only cassette you could buy to make it work.

Your other options are...

-smaller big chainring
-block out the higher gears using derailleur adjustment
-use a different wheel

ultraman6970

Dura ace and ultegra are not compatible from what i know and from what somebody else mentioned... at least italians made sure the whole line up of products from the lower end to the high end are made to work together...

kergin

Lots of bad / confusing information here.

The DA 7800 freehub body uses taller splines and IS compatible with 5600, 6600, and 7800 series 10 speed cassettes. Your issue is that the 14-whatever is a JUNIOR cassette. Junior cassettes aren't compatible with the 7800 freehub body. The reason 7800 splines are taller is because the freehub body is made from aluminum, which gets chewed through badly by individual cogs when using the low-height spline pattern. On 7850 and 7900, Shimano went back to the old spline height of 7700 and switched to using titanium for the FH body.

Bunns1

so is it atall possible for me to chane the freehub so i can run the junior cassette?

kayakdiver

I'm guessing in the end a new rear wheel or hub will be cheaper in the long run.

rydaddy

No, it's not possible.

Psimet2001 

+1 - ...and now you all know why Shimano has stopped using the tall spline - it seems near impossible to explain this easy concept to the vast majority of users. Easier to just make a heavier or more expensive hub.

merlinextraligh

Why not? It would seem likely that you could switch out the hub body to the Ti version with shallower spline height.

Is there some reason that the newer freehub body won't fit the older hub?

Psimet2001 

Not patient enough to read back through to see which specific setup we're talking about but if it was one of the series specific wheelsets then the hubs are not the same setup with the freehub body as the regular individual hubs are.

Jed19

I have two 7800 hubbed wheelsets and specifically called Shimano America to ask if it was possible to switch out the freehub bodies to the new Ti 7900 hubs- and was told no.

By the way, my 7800 hubs were regular hubs as opposed to Shimano 7800 series wheelsets.

rydaddy

My impression was the OP has the DA wheelset, which as you mentioned, are totally different than the stand-alone hubs.

Bunns1

hi guys, thanks for the help. I need to rebuild the wheel I have started this post https://www.bikeforums.net/showthread...4#post10441174. Would this work? PLEASE HELP FELLOW CYCLISTS!!!