Erik Long
Chris, you won't need a spacer on that freehub. Your Ultegra 10 cassettes should be made with a tall spline to fit a Dura-Ace freehub. Just don't try to use anything other than 10 speed Dura-Ace and Ultegra cassettes and you'll be fine.
> Date: Fri, 28 Sep 2007 11:14:23 -0700
> From: cdbrandt@gmail.com
> To: obra@list.obra.org
> Subject: [OBRA Chat] Tech Q.: DA vs. Ultegra cassette
>
> Looking for some mechanical advice...
>
> I have a new rear wheel w/ a supposedly "Dura Ace only" 10 spd. freehub body.
>
> I have a bunch of new Ultegra 10 speed cassettes. I have recently been
> using them on older hubs that are compatible w/ 9 or 10 speed
> cassettes. In those previous instances, I used the thin spacer ring
> that fits into a recess on the back of the cassette spider (behind the
> largest cog).
>
> With my new "DA only" freehub body, the spacer ring does not slide
> across the new taller splines because it has too small of an inside
> diameter. The splines on my Ultegra cassettes seem to match up fine
> to the freehub body.
>
> My questions:
>
> 1. Do I need that spacer if the freehub body is 10 spd only?
>
> 2. Is there such thing as a "DA 10 only" freehub, or might it actually
> be "Shimano 10 spd. only" (meaning my Ultegra/105 10 cassettes would
> work)?
>
> 3. Is there any design difference between Ultegra and DA 10 speed
> cassettes, aside from the expensive and lighter ti cogs?
>
> Thanks for the tips. I'm new to this fancy, newfangled 10 speed biker stuff.
>
> Chris
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