My relationship with these Spin Speed Metal 30 wheels didn't get off to a good start. The valve holes in the 30mm deep semi-aero Niobium alloy rims are a little small which makes it hard to get some valve extenders through, actually, make that impossible.
The Vision Trimax T42 is a versatile alloy/carbon wheelset that's suitable for everyday use as well as racing.
Okay, first the essential info... when Vision describe these as 'carbon alloy clinchers' they mean that they're alloy with a carbon surface on the deep section of the welded rim. They call this Carbon Structural Integration, or CSI for short, and explain it like this: