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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
@Smallfurry
Look exactly like mine. Although mine were described as being T1000 reinforced with kevlar fibres* (not something I can tell from looking at them), as well as having the PU foam core.
The description I recieved:
Item No. FSC5
Rim size: 700c/clincher /48mm
Weight:420±10g
Holes: 16H/20/24H or according to your requirement
Spoke hole size: 4.2mm/2.5mm
MAX spoke holes: 350kgf
Color: UD black
The item No. now relates to the following rims which look and sound exactly the same, but 50mm deep instead of 48mm. But then the ERD given is exactly what I found mine to be. So maybe they've corrected the listing. On the pics you can see the flat inner circumferance.
http://www.alibaba.com/product-gs/392957596/super_light_carbon_clincher_rim_50mm.html
(*I realise these things are unlikely, but I choose to believe them, as it sounds cool)