It seems BMW might be working on another version of their M5, as a test car was spotted on the street with what seems to be a wider track. This forced the engineers from BMW to put extended fenders. It’s not just the track but the tires that are wider. To give some perspective, the normal BMW M5 has 275 mm wide rear tires, while the M5 Competition has 285 mm wide tires. On the photos, you can clearly see that the rear tire width is 295.