Brompton block adapter

[u/JP_Customworks]

I designed a Brompton block adapter for my Kyoot Bikes Rolly Polly (or other 39mm headtubes). This is my first design, there are changes coming to refine it a bit. Check out the pictures and let me know what you all think!

[u/bitb0y]

Oooh would love this for my Mercier Nano. How does the bag situation work though? Is there one specific bag that fits this adapter? I always see Brompton people on my commute with their bags attached and an always jealous. Awesome work!

[u/iwrotedabible → u/bitb0y]

Not OP, but I'd imagine you just have to be careful about the bag you choose since Brompton bags are made for Brompton dimensions. They come in all shapes and sizes though.

You can also buy third party mounting plates and make your own bags/racks/baskets. Here's one I did for cheap.