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classic geometry

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Old 05-19-08 | 12:30 AM
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big ring
 
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From: philadelphia
classic geometry

why are so many old bikes built on a platform of lax angles? at what point did steep head and seat tube angles come into vogue?
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Old 05-19-08 | 12:49 AM
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From: YEG

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Old 05-19-08 | 02:50 AM
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Bikes: Colnago (82, 85, 89, 90, 91, 96, 03), 85 Cinelli, 90 Rossin, 83 Alan, 82 Bianchi, 78 Fountain, 2 x Pinarello, Malvern Star (37), Hillman (70's), 80's Beretto Lo-Pro Track, 80's Kenevans Lo-Pro, Columbus Max (95), DeGrandi (80's) Track.

I think steeper frame angles were more common in the 80's with the introduction of Triatalons. I do have a bike with a 74.5 degree seat tube and 75.5 degree head tube. It's a 1985 built frame. I call it my criterium bike. Very twitchy to ride - you have to pay attention to where you're pointing it.

Incidently, I have another 80's frame with a 70.5 degree seat tube and 72 degree head tube. This frame was a european pro's custom built team bike. Very relaxed yet a very nice and comfortable bike to ride.

What sort of angle do you call 'lax'?
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