Look what I just got in the post

Again, I see no evidence of either ⅛" or VumaChrono versions, and given the manufacturing technique pretty much zero possibility of either custom rings or a production ring for such a micro-niche. If you have a hard-on for Praxis rings, feel free to get some for your standard PCD, standard chainring size, road bike.

Also, and these are relatively minor points but still have a small bearing on the matter, Hansell Composites are a UK company, so my money stays in the UK economy, they are cheap compared with the other options, and I've bought custom products from them before and know their quality of both manufacture and service. Only a strong aversion to using a carbon fibre chainring would make me go shopping elsewhere.

Sorry I keep forgetting about the Vuma specific measurements.