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PostPosted: Tue Sep 02, 2014 9:40 am 
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Location: San Francisco, CA
Interesting comparison of some Tour data taken from two on-line articles (800 gram carbon frames (12 2013), steel frames (8 2013)) and one printed article (Ti frames in #9 2014). It would be interesting to compare deflection data but I don't have it for either the carbon article or the steel one.

This sample is biased in favor of the carbon since the carbon frames selected are the lightest, most expensive available, while in steel, for example, a custom builder like Rob English, emphasizing weight, can get lower than most stock steel frames, which have less emphasis on weight. But I think the Crema represents this quite well: only 1512 g for the frame.

Forks are heavier on the steel and Ti bikes, in general, but I am focusing on frames, since forks can be selected, especially with custom steel, which is still a lot cheaper than those carbon bikes.

Image

Result: best carbon is 704, best Ti is 1350, and best steel is 1512. So the cost of Ti is around 646 grams, and the cost of steel around 808 grams, relative to carbon.

808 grams: that's not bad at all. Still within typical daily body mass fluctuations.

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Last edited by djconnel on Tue Sep 02, 2014 10:47 am, edited 1 time in total.

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PostPosted: Tue Sep 02, 2014 10:09 am 
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Location: France
Those Ti frames are not representative imho, because they are made with heavier and unknown tubing.
My Lynskey is 1250g and most american ti frames would probably be around that weight for a medium size.


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Posted: Tue Sep 02, 2014 10:09 am 


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PostPosted: Tue Sep 02, 2014 10:51 am 
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Antoine:

The Alchemy Eros is a US frame. It may be since Tour uses relatively large frames, with metal that comes with a large per-cm gram cost. Although that frame also has paint, which could be a 50-gram hit.

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PostPosted: Tue Sep 02, 2014 1:54 pm 
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Jee, some of those steel frames are heavy if they're all modern. My 58cm 1988 531c lugged Raleigh is 1865g, and my ten-year-old Cervelo Superprodigy is 1670g (57.5 effective)


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