Geometry Cargo Fork Trail And Rake Numbers
 

I am in the planning stages of building my own cargo fork similar to the popular Crust Clydesdale. These forks use a 20" BMX wheel and have a solid rack attached. I know this is not the best cargo bike solution.
I was wondering if I could get an opinion on how much rake should be used? The bike I plan to use has a head tube angle of 71 and I would like to carry approx. 25-50lbs. I am using an online bicycle trail calculator to play with the numbers but I am not sure what would be best for this type of project. Any thoughts?

with a bmx wheel and 42mm offset, the Crust fork has fairly low trail. Low trail is good with a front load. It may be more comfortable to steer with something up front vs. no-load, but it generally only takes a couple of pounds to slow down the steering enough. For example, a lock or spare tire is usually enough. For 50 pounds, you might feel better with a little more rake, but maybe just 45mm

This helps immensely. I wasn’t sure if I wanted more or less trail with a heavier load up front. Thanks so much!

I ended up with 44mm of trail. I used Columbus Unicrown fork blades on top and a set of heavy duty chain stays below the rack. The rest of the tubes are .035 straight gauge 4130. I made my own brake mount. This is what I have so far.

https://cimg5.ibsrv.net/gimg/bikefor...c3a0a6005.jpeg
https://cimg6.ibsrv.net/gimg/bikefor...d714ceef1.jpeg

https://cimg8.ibsrv.net/gimg/bikefor...c521305f0.jpeg
https://cimg0.ibsrv.net/gimg/bikefor...3643cea65.jpeg
https://cimg1.ibsrv.net/gimg/bikefor...20b3da9e3.jpeg
https://cimg2.ibsrv.net/gimg/bikefor...a543f0979.jpeg
https://cimg3.ibsrv.net/gimg/bikefor...905e4f5cc.jpeg
https://cimg6.ibsrv.net/gimg/bikefor...37967f369.jpeg
https://cimg4.ibsrv.net/gimg/bikefor...5f346f014.jpeg
https://cimg5.ibsrv.net/gimg/bikefor...5de9d0ceb.jpeg

Tdotbike on Instagram for more pics

Thanks for the pictures, that looks great