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grrr quick question(7 posts)

grrr quick questionLeeL
Sep 4, 2003 9:18 PM
I am getting a rear wheel which currently has an 8 speed cassette on it already. I have a 9 speed cassette. The rear hub is Dura Ace. This should be a no-brainer if I recall not requiring any spacers etc. Am I correct?

PS sorry I searched the archives but I turned up a lot of fake leads. TIA
Above topic should be 8 spd -> 9 spd cassetteLeeL
Sep 4, 2003 9:20 PM
Sorry for sloppy subject heading
No spacer. Not all DA 8Sp are 9Sp compatible. (nm)TFerguson
Sep 5, 2003 5:44 AM
Not compatable?off roadie
Sep 5, 2003 2:38 PM
As far as I know, all shimano 8 speed hubs are 9 speed compatable, with no spacers or nothing. Its a straight swap.

However, not all old 8 speed hubs are compatable with all 9 speed cassettes. If (and afaik only if) the cassette has an 11t small cog, there might be a problem (though it's not likely unless the hub is OLD).

For more info, check this link to an article by Sheldon "da man" Brown:
http://www.sheldonbrown.com/k7.html#hyperdrivec
Pre 1997 DA 8Sp hubs are not 9Sp compatible....TFerguson
Sep 5, 2003 6:16 PM
They are non-HG with threads only on the outside of the freehub body. If there are threads on the inside (some have both) then it will take a 9-speed cassette. Also, the non-compact freehub body (has splines all the way to the end) that you refer to that will not accept an 11t can be easily modified with a grinder to take the 11t cog.

TF
Pre 1997 DA 8Sp hubs are not 9Sp compatible....LeeL
Sep 5, 2003 7:32 PM
Thanks for the info guys.

In addition to the other link you just posted TF - here's another one that someone sent me

http://www.sheldonbrown.com/dura-ace.html
Not entirely correct...satanas
Sep 8, 2003 12:19 PM
DA 8spd hubs come in two varieties, UG and HG. The UG cassette bodies have a reduced diameter external thread and NO internal (lockring) thread. They were made in 1989-90 then replaced by the HG body, which remained current until 9spd appeared in late 1997. The UG bodies MUST use a DA threaded top gear cog (hard to find), and will accept HG splined cogs only if the larger spline is filed down on each sprocket.

The 8spd HG bodies have an external thread (not of reduced diameter) and will accept 8/9spd HG cassettes with no problem. If you want to use an 11T cog, a 1mm spacer behind the cassette enables it to fit without any grinding.

Note that the cassette bodies on DA 8spd and DA 9spd hubs are NOT interchangeable; they attach to the hub shells in totally different ways.