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@gbj_tester
CX18s are more like 330g. Ridability of 24h shallow rims depends on your weight - I had no problems with them when I was ~70kg, built with ACI Aero spokes. The wall thickness on the CX18s (same as GP4s, the lower weight all comes from the narrower width) means they are likely to be more durable than your 265g rims, expect lots of cracking around the spoke holes on those very thin walled rims. Mavic GEL280s were notorious for it.