I recently acquired a new bicycle for my main mode of transportation. It’s a Kogswell frame, you could reference the Spring 2010 issue of Bicycle Quarterly to get the specifics for its frame geometry and front-end angles and characteristics, as it is the 700c test bike that they used to do a side-by-side comparison of the handling differences between 26″, 650b, and 700c wheels in different tires sizes. I migrated many parts from my previous bike to this one when I built it up, including my main cargo carrier, the Cetma Rack and Swift Industries Pelican bag. The Cetma Rack is a great product for what it is, a versatile cargo rack capable of hauling large amounts of weight and able to be attached to virtually any bicycle ever made without modification. However, it is lacking in a couple of areas, mainly stiffness and aesthetics. The P-clamps that attach the struts to the platform are not secure enough and the rack has a lot of play. I originally got it because it was a massive improvement over my dishwasher crate tied to a cheap aluminum front rack, and I am once again ready for an upgrade.
The Kogswell has Fork Crown, Mid fork, and 6mm upper dropout braze-ons, and it’s a shame to be using a rack that doesn’t take advantage of any of these. This is great beginning project for foray into the world of brazing, but the first task is to design. I, like usual, am trying to make something different. The rack I want to build is a multi-use, convertible piece of equipment, capable of carrying my Swift bag and also loosing some weight and supporting a smaller lighter bag for longer rides where I’m not carrying 30 pounds of groceries. The basic idea I’m working off here is that there will be a small randonneur style rack as a base (13cmx21cm), built from slightly heavier tubing than typical. It will anchor to the fork crown mounts and either the cantilever posts, or the mid-fork braze-ons (still thinking about that one). On top of that will be a removable 30cm square platform that will anchor to the smaller rack via sleeves, or bolts, or something else bearing a remarkable resemblance to magic. I sketched something out in Solidworks this afternoon, which I think is a decent looking proto-type. I’m still unsure about the cantilevered weight and not having support directly below the load.