Being interested in frame geometry, I love this topic and have wanted to measure my frames, but am just starting to get to it. Only a few to do. My lovely wife Amy assisted me in measuring these bikes. Its hard to get spot on with the measurements when eyeballing the centerline of the HT/fork to get the HT angle, but I think they're very close.
My 75-77? Pinarello - rides great but not as quick a turner as my 80's De Rosa's ST 58cm TT 58cm ST angle 73 HT angle 74 Rake 52.5mm BB drop 77.5mm CS 415mm Wheelbase 100.25cm Trail(calculated myself?) 4cm
My 89-90 De Rosa (KOF for comparison) ST 59.5cm TT 58cm ST angle 74 HT angle 75 Rake 47mm BB drop 75mm CS 415mm Wheelbase 101.5cm Trail(calculated myself?) 4cm
I'll work on some more later. It would be interesting if bikes displayed at Cirque could include this info.
Roman Stankus Atlanta, Ga.
-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] On Behalf Of Chuck Schmidt Sent: Monday, January 31, 2005 1:50 AM To: classicrendezvous@bikelist.org Subject: [CR]Vintage Racebike Geometry
The results so far... here's some of my bikes (anyone else care to contribute?)
1939 Bianchi #718923-0 (c to c) Seat Tube -- 54.0cm Top Tube -- 58.0cm BB drop -- 8.0cm Chain Stay -- 46.0cm Wheel base -- 110.0cm Seat Tube < -- 71.5° Head Tube < -- 70.0° Fork Rake -- 8.0cm Trail -- 4.0cm* *wheel dia. 68.5cm
1950 Bianchi Folgorissima #287197 (P-R derailleur) (c to c) Seat Tube -- 57.0cm Top Tube -- 57.0cm BB drop -- 8.2cm Chain Stay -- 45.0cm Wheel base -- 104.0cm Seat Tube < -- 73.00° Head Tube < -- 74.25° Fork Rake -- 6.0cm Trail -- 3.4cm* *wheel dia. 68.5cm
1960 Cinelli SC #7094 (c to c) Seat Tube -- 55.5cm Top Tube -- 56.0cm BB drop -- 8.0cm Chain Stay -- 42.5cm Wheel base -- 102.0cm Seat Tube < -- 73.0° Head Tube < -- 73.0° Fork Rake -- 5.5cm Trail -- 4.6cm* *wheel dia. 68.0cm
1963 Masi Special (c to c) Seat Tube -- 56.0cm Top Tube -- 56.0cm BB drop -- 8.0cm Chain Stay -- 44.0cm Wheel base -- 103.0cm Seat Tube < -- 73.5° Head Tube < -- 73.5° Fork Rake -- 5.5cm Trail -- 4.3cm* *wheel dia. 68.0cm
1980 Colnago Super (c to c) Seat Tube -- 55.5cm Top Tube -- 55.5cm BB drop -- 7.0cm Chain Stay -- 41.7cm Wheel base -- 100.0cm Seat Tube < -- 74.0° Head Tube < -- 74.0° Fork Rake -- 4.6cm Trail -- 4.9cm* *wheel dia. 67.5cm
Trail calculation http://www.kreuzotter.de/
Chuck Schmidt South Pasadena, Southern California
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