Join Date: Feb 2004
Location: beautiful coastal South Carolina
Bikes: 1991 Trek 930, 2005 Bianchi Eros, 2006 Nashbar "X," IRO Rob Roy
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there is a difference.
not sure why they have different model numbers, but the 511-1 appears to be equivalent to the U.S. market "590 V2". the 511 is equivalent to the U.S. market "589," albeit made of metal rather than metal and plastic.
the difference is that the 511-1 and 590 neck down just behind the clamping portion. this allows clearance for large calipers. the 511 and 589 lack the narrow portion, which may interfere with some calipers.
i've got a 590 and a much older (over 5 years) tray. my mountain bike fits fine on both, but the older tray holds the bike "higher" than the new clamp style does and my front disc is a relatively svelte Hayes HFX 9, with a fairly small caliper. your results may vary...