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nice but not easily available and will be pricey .. I was looking at this: https://r2-bike.com/Wheelset-28-Novatec-Hubs-NoTubes-Rim-Road-Clincher-Sapim-CX-Ray-RR-CX
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Just get some Superstar Pave 28s next time they have a 10%/20%/30% offer. They're light enough, they work perfectly happily with tubeless tyres (even though they not officially tubeless compatible) and if the difference between them and some lighter wheels will make a real difference how fast you get up an Alp then you need to be calling Dave Brailsford so you can get him in touch with your agent to talk numbers...
Velocity Quill?