Sentence:  Another possible way is to go for a lower profile tyre (50 series). This effectively lowers the distance of the tyre wall away from the <WSD>guard</WSD> (not by much though and generally, the lower the profile, the wider the tyre so the tyre may stick out more as well). 
Meaning of the word marked with <WSD> tags:  A panel of a car that encloses the wheel area, especially the front wheels.