Thread: For the love of English 3 speeds...
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Old 06-03-19, 07:04 AM
  #20563  
paulb_in_bkln
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Location: Brooklyn, NY
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Bikes: 1983 Trek 600, 1972 Raleigh Sports Step Thru, 1963 Rudge Sports, 2007 Dahon MuP8, Dahon Speed, Public Mixte 8-speed IGH, mid-70s Peugeot Mixte AW conversion, Riv Platypus

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Originally Posted by Road Fan
I'm not too clear on scorchers, but I have the 1952 Rudge Aero special frame and the 1973 Super Course frame nearby, both abour 54 or 55 cm seat tube.

Let's compare the geometries:

Seat tube length: Rudge 55 cm, SC 54 cm
Seat tube angle: Rudge 71 deg, SC 73 deg
TT length: Rudge 57 cm, SC 56 cm
Head tube angle: Rudge 73 deg, SC 73 deg
Fork offset: Rudge 63 mm, SC 59 mm
Front Center: Rudge 65 cm (estimated), SC 62 cm
Chain stay length: Rudge: 44.5 cm, SC 45.5 cm.
Wheelbase: Rudge 106 cm, SC 103 cm.
It seems to me it's the seat tube angle that is the main, more difficult to duplicate, difference between your Rudge Aero and one of the many easy-to-find DB steel frames that would make good platforms for one of the more unusual old SA hubs, like the FW.
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