Me desculpem a falta de fotos, mas parece que está inibido copiar link da foto no Aliexpress.
Então para ver tem que abrir os links.
São só como exemplo, pois há uma quantidade grande de fornecedores de rodas, aros, garfos de fibra de carbono aro 20" (em ambos os tamanhos).
Acho o preço salgado ainda...
Roda fibra de carbono aro 406 - 50mm - (aros 290g)
http://www.aliexpress.com/store/product/FULLFUN-Carbon-Wheelset-20inch-50mm-406-20-Clincher-Mountain-Bike-Folding-Bike-Full-Carbon-Disc-Brake/416174_1176769887.html
Roda inteira em fibra de carbono (3 raios de carbono) aro 451 - 50mm
http://www.aliexpress.com/store/product/FULLFUN-Carbon-Three-Spokes-Wheels-20-451-50mm-20inch-Folding-Bike-Clincher-Full-Carbon-Front-Wheel/416174_1163335225.html
Par de rodas para reclinadas 451 e 700C, com parede de 50mm
http://www.aliexpress.com/item/Carbon-Recumbent-Bike-Wheeset-Front-20-451-50mm-Clincher-Rear-700C-50mm-Clincher/1282474999.html
Par de rodas 451 - 38mm
http://www.aliexpress.com/item/Best-Lightweight-451-Carbon-BMX-Wheels-Clincher-38MM-include-skewers-brake-pad-extension-valve-Rim-Tape/1267669075.html
Par de rodas de alumínio perfil alto aro 20 (451 ou 406) com 16 raios para freio a disco ou não:
http://www.aliexpress.com/store/product/Machete-451-daguerreotypes-ring-seam-round-none-20-406-daguerreotypes-disc-black-round/704209_1250724795.html
http://www.aliexpress.com/store/product/Machete-451-daguerreotypes-ring-seam-round-none-20-406-daguerreotypes-disc-white-round/704209_1250711289.html
http://www.aliexpress.com/store/product/Machete-120-20-406-daguerreotypes-ring-wheel-sp8-wheel-stanchart-wheel/704209_1250738347.html
Par de rodas alumínio (406mm) com 12 raios na frente e 16 atrás (bem estranho)
http://www.aliexpress.com/item/Vuelta-406-daguerreotypes-wheel-folding-wheels-stanchart/1291427695.html
Garfo de carbono 406mm
http://www.aliexpress.com/store/product/Stanchart-controltech-f-138i-folding-bike-20-406-v-carbon-fiber-front-fork/704209_1250727887.html
Garfo de carbono 451mm (355g)
http://www.aliexpress.com/store/product/Stanchart-controltech-f-146i-folding-bike-20-451c-clip-fork-carbon-fiber-front-fork/704209_1250721093.html