My understanding is Gordon Borthwick no longer builds frames, but was based in Iowa. From the internet archive,
http://web.archive.org/web/200212240...m/bp_borth.htm
"Borthwick Framesets Inc.
Builder Profile
About Borthwick:
Borthwick Framesets was established in 1986 when I turned a hobby into a full time business. I build only custom frames and during the last several years, approximately 80% of my business has been custom tandem framesets.
I like to think that the primary requirement of a custom bicycle frame is that it be worn like a tailored piece of mechanical clothing--
optimized to fit our bodies
optimized for overall appearance
The Bicycle Torque Coupling System is really well designed and allows all the benefits of a custom frame--plus, the ability to travel with your custom bicycle in a regular size piece of luggage.
Products and services available utilizing BTCs.
We sell frames and complete bicycles.
Standard frames
Not Available
Custom frames
Road Racing
Touring
Hybrid
Off Road
Tandem
Weeks wait 12
Retrofitting services
Only on frames originally manufactured by us
Weeks wait 12
Construction methods
Lugged
TIG welded
Fillet brazed
Frame materials
Steel
Purchase from
We sell through retailers but will sell direct in areas where we aren't represented.
Contact Information
Borthwick Framesets Inc.
628 Park Street
Grinnell, Iowa 50112
Phone: (641) 236-0968
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TEL. 916-771-0235 FAX 771-0397
e-mail:
steve@sandsmachine.com"