Tom asked about dynamical implications and purposes of an R.O. Harrison with a seat tube attached to the DT forward of the bottom bracket shell. I've never ridden one. Its the first I've seen, so I can only speculate.
First, it seems a remarkably elegant solution to shortening wheelbase. Compared to flying gates' framing complexities and curved seat tube metallurgy, this just seems to put those to shame from a design simplicity standpoint. And it appears to provide a wider effective bottom bracket angle, which might lessen the punishment of near vertical seat tubes and narrow bottom bracket angles in more conventional shortwheel base designs. And the real cleverness is that it keeps the chainwheel and pedals quite as nearly under the seat as would other shortwheel base designs. Lastly, aesthetically, it creates two trapezoids in the framing rather than the conventional trapezoid mainframe and triangular seat stay, chain stay and seat tube subframe. It's hard to know whether this would be a heavier a short wheelbase solution than other solutions or not without putting it on the scales. It looks like it would be slightly heavier than a curved seat tube solution, but perhaps lighter than a flying gate. In any case, very neat.
Don Wilson
Los Olivos, CA USA
> I am on the UK Classic light Weights site looking at
> a bike called a R O
> Harrison Shortwin. The year seems seems a bit
> uncertain being given in the
> URL as 1947 and on the caption as 1949.
>
http://www.classiclightweights.co.uk/
> This has the seat tube joining the down tube a
> couple of inches forward of
> the bottom bracket shell. This gives a very strange
> angle to the seat tube.
> I am wondering if this is unique to this maker? Is
> there a logic for this
> arrangement that escapes me? Perhaps some of our
> Brit members has some
> light to shed on this? Never seen such an
> arrangement before.
> Tom Sanders
> Lansing, Mi
>
>
> _______________________________________________
> Classicrendezvous mailing list
> Classicrendezvous@bikelist.org
>
http://www.bikelist.org/
>
D.C. Wilson dcwilson3@yahoo.com ----------------------------------------------------------- Note: This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation. -------------------------------------------------------------
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
_______________________________________________
Classicrendezvous mailing list
Classicrendezvous@bikelist.org
http://www.bikelist.org/