Today I changed the old chainring and stumbled into orientation problem. I have Sora crankset with 46-36 chainrings, the new one is 50T; the old 46T chainring is flat but the new one is slightly concave. When I oriented it the way the numbers are on outside then the concave teeth part os oriented towards the small chainring and chain is rubbing against big ring, here you can see the ring combination 1:




Turned the big ring and installed the other way around (fig. 2) and now the chain is happy, but I have some doubts if this is really correct way how to install the big ring. I am not an expert but for me the teeth looks that they should be the other way around; maybe someone more knowledgable can verify that the big chainring is positioned correctly? If it indeed needs to be turned around, should use some washers to move small ring further away from big ring to avoid chain rub? Here are some pics with teeth: