To get the rear track of a 2011 BMW 1-Series, I recommend checking:
* BMW's official website: You can often find detailed specifications for different models and model years on the manufacturer's website.
* A reliable automotive website: Websites like Edmunds, Kelley Blue Book, or Car and Driver often have detailed technical specifications for various vehicles.
* Your owner's manual: The owner's manual for your specific vehicle should provide this information.
* A mechanic or car dealership: A qualified mechanic or BMW dealership can provide you with accurate information about your vehicle's specifications.