Client: the bike company Shekari-Group script: Faezeh Shamspour Director Of Photography & Edit: Vahid Dastmardi Director: Vahid Dastmardi and Faezeh Shamspour Riders: Shirin Zarinkolah & Hossein Zanjanin Modern MTBs come in three different rim sizes. 559 mm – 26″ (it’s read: “26 inches”). 584 mm – 27.5″. 622 mm – 29″, or 29er (“twentyniner”). 26″ wheels are the strongest, and the easiest for maneuvering in tight spots, but they are the slowest-rolling. 29″ wheels are the opposite – weakest, but fastest rolling. 27.5″ are in between those two when it comes to pros and cons. With the most limited tire choice in the market (in my experience at least). Source…