Research Stage 3, 3/12/18 - 10/12/18:
To move from the desk test setup to the first ridable prototype, P1. I will need to buy a clamp for mounting to the seatpost or the bikes frame (these seem to be the most straightforward mounting locations so I will focus on them for the first mock-up). I think it makes sense to buy a commercial seat clamp (known as an “O-clamp” or an “axle clamp”) as they are readily available and made to fit the range of tube sizes.
Common min and max diameters for bike seatposts: 21.15 - 34.9mm
Common clamp sizes: 28.6mm, 31.8mm
Seat Tube Sizes:
“If you know the size of your seatpost, it’s straightforward as there are only 3 clamp sizes:
28.6 if you’ve got a steel frame with a 27.2 or smaller seatpost
31.8 for alloy or titanium frames with a 27.2 or smaller seapost
34.9 for virtually everything else i.e. most frames that take a 31.6mm post.”