This QR type hub is ideally suited to folding bike at 6V3W output and perfect for rim brake with OLD 74mm. From 2018, SP SV-8-FC is the only dynamo hub you can find at Brompton official website. It is super light and small. Ideal for premium Brompton bikes. The smooth oval shape of the hub was optimized for balance, while attaining an unprecedented weight only 350g.