Bob -
Best way to look at that is the Atlantis is the (continually) refined version of the A/R. The first three models - Road, LongLow and All-Rounder - really provide the roots for a Rivendell designs, but it's clear that the iterative process of design and testing has created beautiful branches. They've all influenced one another and have definitely benefitted from development of components - the Hilsen could not have come to be without the reintroduction of longer-armed brakes, for example. If you read back through GP's annual "wish lists", they often call for then-nonexistent bits which have since come to pass.
Kickstand plates didn't start showing up until the intro of the A. Homer Hilsen. Then they morphed into the other models.
Scroll down for the plate details here -
http://www.cyclofiend.com/rbw/hilsen- Jim
On Tuesday, January 8, 2013 12:24:58 PM UTC-8, Bob Cook wrote:
Apologies for my ignorance, but what are the differences between the A/R and the Atlantis, other than fancier lugs on the former and a kickstand plate on the latter? Comparison of A/R geometry posted on Cyclofiend (a treasured resource; thanks, Jim) and Atlantis figures in current Riv geometry document shows minor differences between the two models. Different tubing?
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Bob Cook