[CR]Woman's frame (not mixte) lightweights?

(Example: Production Builders:Tonard)

Date: Thu, 05 Jul 2007 11:45:58 -0500
To: classicrendezvous@bikelist.org
From: "Mark Stonich" <mark@bikesmithdesign.com>
Subject: [CR]Woman's frame (not mixte) lightweights?

Does anyone have experience with "Woman's" frame (not mixte) lightweights? They get no respect, but builders not known for putting out floppy frames, such as Grandis http://www.bikecult.com/works/archive/06bicycles/grandisEXrs.JPG Schwinn Paramount P65 http://www.geocities.com/sldbxtralite/1974/74xlite06b.jpg or Colnago. http://www.hollywoodsgarage.ca/images/body/large/showbikes.jpg have used this design.

BTW I'd love to see links to others

I'm wondering if they performed significantly differently than the men's versions of similar bikes.

I also would like to know what size seat posts they used. (To estimate seat tube wall thickness.)

I'm thinking about building my wife a lighter frame.

I could build her another, lighter, mixte. But the article by Peter Weigle in this month's Bicycle Quarterly has me thinking about the relative merits of the Woman's frame vs. the Mixte. Most of the added rigidity of a Mixte over a "Womans" frame seems to be in the vertical plane.

One of the challenges of building a good frame is reducing vertical stiffness (within limits) without sacrificing torsional rigidity. A high quality seat tube can give significant vertical compliance without ever nearing it's yield point. I'm wondering if it might be better to invest the weight of the mixte stays in slightly heavier seat tube and chainstays.

This bike would be used for day trips or supported touring by a rider who probably weighs about 180 lbs and who never stands when riding.

Mark Stonich;
     BikeSmith Design & Fabrication
       5349 Elliot Ave S. - Minneapolis. MN 55417
            Ph. (612) 824-2372 http://bikesmithdesign.com
                        http://mnhpva.org