Actually, most wood filled rims are not _completely_ wood filled, but rather are reinforced around the spoke holes with wood blocks (don't ask me how they get these blocks into the rim in teh extrusion process - maybe that's why they were and still are so expensive). The nicest ones I've seen are the German _Scheeren_ rims, available in "Standard" (Road - 7 1/2 ounces) and "Weltmeister" Track - 7 ounces) versions.
A version of this rim was manufactured by the Milremo Company of Ron Kitching fame, but they were slightly different, with a dimpled bed and slightly heavier(by 1/2 ounce).
The Germean Scheeren company also produced Handlebars, Stems, Pumps, Racks, mudguards and other aluminum sundries. IMHO, their only product worth it's (light) weight were their rims. The finish on them is mirror smooth and they hold true like no others. Spoke holes were drilled with specific offsets for 3 and 4 cross patterns.
Legend has it that these were Spence Wolf's favorites, but I don't want to start a myth here (or maybe I do) :)
Ken Denny Boston
>From: Steve Freides <steve@fridayscomputer.com>
>To: Classic Lightweights <Classicrendezvous@bikelist.org>
>Subject: [CR]Wood-Filled Aluminum Rims
>Date: Mon, 29 Jan 2001 14:25:40 -0500
>
>Were wood-filled aluminum rims somehow the "bridge" between all wood and
>all
>metal rims, or do they have their own history?
>
>Thanks.
>
>Steve "enjoying learning about rims" Freides