Bike frames tubes other than a French Cul de Sac, since abandoned,
tend to be fractional , so have to be stated as a decimal mm, ala 28.6mm
so .. 1.75" x 25.4=44.45mm
Add: then theres the thickness of the powder coat finish..
Last edited by fietsbob; 12-16-13 at 02:04 PM.