I have a 20 inch wheel folding bike and received the brompton wheel. Not sure if that was my fault but I believed I had ensured it was not a brompton that I needed. The return was relatively easy. Once the correct wheel arrived, it was fairly easy to install. The swytch is my favorite of the 2 e-bikes I have- it is effortless on flats and manages enough to assist relatively steep hills. It doesn’t add so much weight as to make a noticeable difference on the ride. Other than having to deal with the company via email, swytch is a great product. And it’s not rocket science to install altho if you no longer have hand strength it helps to have a curious friend help when needed.