[email protected] (Richard Chan) wrote in message
news:<
[email protected]>...
> "Mike Jacoubowsky/Chain Reaction Bicycles" <
[email protected]> wrote in message
> news:<
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> > > Anybody know if the new 10-speed Dura Ace will be available in a triple in 2004 or must I wait
> > > a while? Gary
> >
> > Word on the street is that you must wait until '05. Product managers (for various bike lines)
> > were quoted in the latest Bicycle Retailer and Industry News as not being terribly happy
> > about this.
>
> So why couldn't one use the current 9 speed DA triple (FD and cranks) on a otherwise 10 speeds
> drivetrain? Fuctionally the new cranks may be better but it sure looks funky.
Agree, but I would also stay away from the DA triple crank. Why? Mickey Mouse design. Here's Sheldon
Brown's excellent evaulation of the crank:
"While other Shimano "road" triples come with 52-42-30 chainrings, the Dura-Ace version comes with
52-39-30 rings. At first this seemed like a welcome upgrade, offering greater versatility to the
road/touring cyclist. Unfortunately, the way Shimano chose to do this is rather wrong-headed and
retrograde, resulting in a crankset that is even less versatile than their 130/74 "road" triples in
the Ultegra, 105, Tiagra and Sora lines.
Instead of using a crankset with two sets of mounting holes, as with other modern triple sets, they
have the 30 tooth chainring attach to the 39 tooth ring, rather than to the crank itself, in the
manner of a Willow Triplizer or a TA conversion chainring. "Oh, great," you say, "so then you can
retrofit the 39 onto other 130 BCD doubles!" Well, no. Unlike the Willow and TA conversion rings,
the Dura-Ace is specifically designed NOT to fit a standard 130 double crank, because the "shelves"
that support and center the middle ring get in the way. The "triple" Dura-Ace crank has had these
"shelves" machined off flush, so it is the only crank that can accept this chainring, even though it
does still use the standard 130 mm bolt circle.
But wait! It gets worse! Instead of using the standard 74 mm bolt circle for the 30 tooth chainring,
as they do on all of their other "road" triples, Shimano has seen fit to create a brand-new bolt
circle pattern just for this application, 92 mm. Thus, there is NO other chainring besides the stock
30 that can be used with the Dura-Ace triple."
I would use DA 10 right shifter, DA dt left shifter and if you want shimano crank, ultegra triple
crank and fd....