Hi Nic, out of all my knobblies, they all have similar flattened "ish" polished rims. They undulate a bit in and out and up and down in some cases, but don't look too dissimilar to yours. Interestingly though, my Meadow green one is perhaps got the "neatest" rim of all and is almost a proper circle compared to the others. Your ruby one looks fine.....just a bit of a heavyweight. emmi