Toroidal carbon rims are getting so cheap (might be basalt braking surface too) http://www.aliexpress.com/item/1Pair-Newest-700C-50mm-clincher-rim-Road-bike-matt-finish-UD-full-carbon-fibre-bicycle-wheels/32245768695.html
http://www.light-bicycle.com/carbon-700C-25mm-wide-road-rim-clincher-35mm-deep-U-shape-tubeless-compatible-basalt-braking-surface.html
These have the Basalt
They're aren't 'toroidal' though, just wide I think.
and 100$ more a pair +vat etc.
@spotter started
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Toroidal carbon rims are getting so cheap (might be basalt braking surface too) http://www.aliexpress.com/item/1Pair-Newest-700C-50mm-clincher-rim-Road-bike-matt-finish-UD-full-carbon-fibre-bicycle-wheels/32245768695.html