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yoshy-
Ah, yes, forgot that bit. I'd probably email Superstar and see if they actually made them that size.
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Looks like Gebhardt do NW chainrings but I can't read Czech so have no idea of details:
https://www.gebhardt.cz/cs/novinky/prevodniky-se-stridavou-sirkou-zubu- -
You can get Chinese, either from eBay or Aliexpress. SRAM does 110 BCD NW chainrings, Race Face too.
hippy
Netakure
What's reasonably priced to you? 104 bcd?
Superstar do Silver, might need to hunt around for 40T, looks like 38T is their max unless you're after a 110bcd version. Oh wait, 5-bolt? Err..
http://www.superstarcomponents.com/en/i-o-chainring-narrow-wide-style.htm
Stronglight do 5-bolt, 110bcd, silver, 40T:
http://www.ebay.com/itm/Stronglight-5-Arm-110mm-Alloy-Silver-Chainring-RD110-/120576056736
Sonic Cycles do Gebhardt which have silver, 40T:
https://www.soniccycles.co.uk/products.php?id=100&cat=2