Dura-Ace cassette question

Quoth Lewis Campbell:

Quoted message said:

I have a wheel with a Dura-Ace 7 speed cassette, 12-21, that I would like to change to an 8 speed,
12-24 (or thereabouts).

Is there anything I have to look out for in my choice?

Will 'any' Shimano HG cassette work, or does it have to be DA ?

7-speed Dura-Ace was Uniglide. It is possible to fit Hyperglide splined sprockets onto it if you
grind/file off the wide spline insied of each of the Hyperglide sprockes.

However, you'll still need the 12 tooth threaded Dura-Ace Uniglide top sprocket to hold everything
together. If yours is worn out, you're
S.O.L., these are extinct.

It is possible to replace the 7-speed Uniglide body with an 8-speed Hyperglide body (has to be the
Dura-Ace model though.)

If you do replace the body, you will be able to use any 7-,8-,9- or 10-speed Hyperglide cassette
that doesn't include an 11 tooth or smaller sprocket.

I have a detailed article on Dura-Ace interchangeability issues at:

sheldonbrown.comdura ace.htmlOpen ↗

I sell the Hyperglide bodies and lend out the special tool, see:

sheldonbrown.comk7.htmlOpen ↗

Sheldon "Make It Work" Brown +--------------------------------------------------+
| The less you bet, the more you lose if you win | --Alan Rudolph (_Trixie_) |
+--------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041 harriscyclery.comharriscyclery.comOpen ↗ Hard-to-find parts shipped Worldwide
captainbike.comcaptainbike.comOpen ↗ sheldonbrown.comsheldonbrown.comOpen ↗

Thanks, Sheldon, that explains everything clearly.

Well, except for why you spell 'derailleur' the American way. :-)

--
Lewis.

tinyurl.comr3r6Open ↗ .........................

*******************************

"Sheldon Brown" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

Quoth Lewis Campbell:

Quoted message said:

I have a wheel with a Dura-Ace 7 speed cassette, 12-21, that I would

like to

Quoted message said:

Quoted message said:

change to an 8 speed, 12-24 (or thereabouts).

Is there anything I have to look out for in my choice?

Will 'any' Shimano HG cassette work, or does it have to be DA ?

7-speed Dura-Ace was Uniglide. It is possible to fit Hyperglide splined sprockets onto it if you
grind/file off the wide spline insied of each of the Hyperglide sprockes.

However, you'll still need the 12 tooth threaded Dura-Ace Uniglide top sprocket to hold everything
together. If yours is worn out, you're
S.O.L., these are extinct.

It is possible to replace the 7-speed Uniglide body with an 8-speed Hyperglide body (has to be the
Dura-Ace model though.)

If you do replace the body, you will be able to use any 7-,8-,9- or 10-speed Hyperglide cassette
that doesn't include an 11 tooth or smaller sprocket.

I have a detailed article on Dura-Ace interchangeability issues at:

sheldonbrown.comdura ace.htmlOpen ↗

I sell the Hyperglide bodies and lend out the special tool, see:

sheldonbrown.comk7.htmlOpen ↗

Sheldon "Make It Work" Brown +--------------------------------------------------+
| The less you bet, the more you lose if you win | --Alan Rudolph (_Trixie_) |
+--------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041 harriscyclery.comharriscyclery.comOpen ↗ Hard-to-find parts shipped Worldwide
captainbike.comcaptainbike.comOpen ↗ sheldonbrown.comsheldonbrown.comOpen ↗

Lewis-<< I have a wheel with a Dura-Ace 7 speed cassette, 12-21, that I would like to change to an 8
speed, 12-24 (or thereabouts).

Is there anything I have to look out for in my choice? >><BR><BR>

Cannot put a 8/9s cogset onto that freehub body. You can convert it to a taller , 8/9s one, that is
also hyperglide, Your cogset is probably uniglide...The new freehub body must be a pre 9s DA one,
as they attach differently than all the others. Also you need to ensure your frameset has 130mm
spacing as well.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"