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bigshape
Which shimano crank? Is it asymmetric?
I bought a J&L one recently. https://www.ebay.co.uk/itm/J-L-Narrow-Wide-1x-ChainRing-Fit-Shimano-105-Ultegra-Dura-Ace-38-40T-42T-44-46T-/302375911871?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
Only other one I could find was wolftooth which was much more spendy.