5-Speed Gearing, Early Brompton | lovelybicycle.com | Velouria | Flickr
16inch 349 Mini Bike Carbon Wheel Stumery Internal Gear 3/5speed Hub Folding Bicycle Parts Clincher Cycling Rim For Brompton - Bicycle Wheel - AliExpress
Silverock 14/21 5-7 Speed Front and Rear Hub Set for Brompton Bicycle – Fantastic4Toys