This is the first glimpse of Shimano’s flagship road group the Shimano Dura-Ace, completely redesigned for 2004. They reckon it’s 10% lighter than the already-svelte existing group and that’s despite an extra sprocket on the cassette. Yes, Dura-Ace goes 10 speed for ’04.

More interesting, though, is the all-new crankset. Just as the thinking behind Shimano’s Dual Control STI levers crossed over from road to MTB, so MTB returns the favour – The new DA crankset uses the same Hollowtech II technology as 2003 XTR.

The cranks are an integrated system and include the bottom bracket. They have to really, as the bottom bracket axle is permanently attached to the drive-side crankarm. Unlike XTR, you can’t see right through the spindle as the drive-side is closed off by the smooth crank surface. Very aero. The other end is splined, with the left-hand crank being secured by pinch bolts.

To accomodate the bigger axle, the bearings now live outside the BB shell – they’re 28mm further apart than the existing Dura-Ace bearings which should lead to added stiffness and extended bearing life. The pedals don’t get any further apart, though.

The rings are new too, with extra machining and new shifting ramps saving weight and improving smoothness. The whole assembly is claimed to be 30g lighter than the equivalent 2003 parts – not a massive amount but if the stiffness and durability claims are justified then weight saving as well is a bonus.

If nothing else, they look great and should look even better in traditional Dura-Ace shininess. Don’t hold your breath, though – the 2004 group isn’t going to be available until November…