Alex DC 19 rim

Features an aluminium 15mm axle and a carbon fibre handled quick release. Weighs 40g as claimed.

This looks like a really nicely made rim with a combination of great features:

These rims feel insanely light, its almost like there's nothing there.

There are not many lightweight rims available for 24" mountain bikes. The three options I know of are:

Quick specs:

Quickfacts: