I have a Brompton M6R (actually an M6L with a rear rack installed) but opted not to get the EZ wheels, since they were about $50 a set, and I needed two since I have two Bromptons.

I ended up purchasing eight 76mm 80A inline skate wheels, 16 wheel bearings thingies (608), 8 spacers, and four M6x1.0 in 30mm length.  I reused the rear rack wheel screws since I didn’t purchase screws in size M5 but I’ll do that tomorrow.  The standard ones will work, but they aren’t long enough to keep the bungie cords attached.  The install was super easy, but here are the pictures to help motivate you to do the same.

Original configuration:

Most of the parts:

Close up of the replacement screws:

The screw length was barely long enough to work, so I may try getting screws with a length of 35mm, but Lowe’s only had lengths 30mm and 40mm, and 40mm was way too long.

Picture of one of the skate wheels I purchased:

Brompton cone wheel and skate wheel side by side:

The wheels don’t seem any wider than the standard Brompton wheels, but they are definitely larger in diameter.

Wheel bearings:

Step 1: Pop the bearings into the wheel along with the spacer. The spacer is just a metal sleeve that separates the wheel bearings. Supposedly they help extend the life of the bearings, but for the Brompton, it’s probably overkill.

Step 2: Screw them in! This part was super easy. Just reuse the washer.

The rear wheels (if a rack is installed) is the same, except, depending on the length of screws, you may or may not be able to keep the bungie attached. I was unable to keep the bungie attached with the original screws. I kept the original screw, three washers, and the nut for each wheel.

That’s all it takes! These are the pictures showing the resulting wheels installed on one of the Bromptons. I still have to get longer screws for the rear wheels and I have to buy the rubber bung for the seatpost or retro fit something standard; without a rubber stop in the seat post, the bike rolls too easily now!