Google Maps has several limitations including size: https://developers.google.com/maps/documentation/maps-static/dev-guide#Imagesizes

With the latest API changes and possible cost increases, we should look at some alternatives.

Currently leaning towards MapBox & Leaflet as that's what Strava is using. Branch for this work: https://github.com/cmanon/wp-strava/tree/feature/26-alt-maps-leaflet