Winner Kristian/Christian Frisch of Denmark (left) and silver medalist Erik Westerberg of Sweden (right) at Mälaren runt. This was a nordic event held every year.  This picture is from 1917, and it may have been on August 28, 1917 (really? This is a Wednesday).<a rel="nofollow" class="external autonumber" href="https://www.cyclingranking.com/races/1917/malaren-runt">[1]</a> I think this is at the Stockholm Olympic Stadium, where the race used to end (maybe it also started here). The race was around 318 km this year.
Unknown photographer
<a rel="nofollow" class="external autonumber" href="https://www.nb.no/items/3fdbdce096e4c50b40ed4bfa72175c12?page=413">[2]</a> (Norsk Idrætsblad, 1917)