Originally Posted by
Geoffroy2020
Thank you for the suggestion. I wasn't sure I could do it as a newbie. Here are a few pictures. Basically the rack has two 4mm diameter to threads, one on either side. I cannot find M4 wheels...
Rack thread
Are you sure it’s M4? Brompto and Birdy are M6 and there are lots of wheels available for them. You may try to accommodate one version or another of Easy Wheels for Brompton from, say Litepro. They have bearings so technically if you will secure them they should work. Maybe local Brompton shop/service center can give it a try.