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This.You'll need it at some point, and if you hit something or someone at least there's no sharp edge.
I'm 1.80m on a Medium (on the recommendation of the designer/owner)and I sometimes find the reach a little short. Couriers on them tend not to favour a very aggressive position, so that'll explain the size guide I think.
You're welcome to try mine, but you have to come to Denmark...
Looking at the sizing guide for the Omnium it seams a bit confusing. I’m 178cm tall which put on a medium, but when I measure up again the bike I ride most, surly crosscheck 56 the medium seams very small, standover about 3cm lower etc. The sizing of my crosscheck is much closer to the large Omnium. I guess I’m going to need to see the medium and the large in person.