The phrase "taller sidewalls" refers to the height or thickness of the sides of something, like a tire. It means that the sides of the tire are higher or taller, providing more cushion and protection. Full definition
The 18 - inch wheels with taller sidewalls on the tires should offer a softer, quieter ride, however. (phillipschevy.com)
You won't be doing any spirited driving in this family truckster, but what you get in return is sublime ride quality that's smooth even over some of the most badly broken pavement, aided by tall sidewalls on the 17 - inch tires that soak up bumps with little noise or disruption to your serenity. (cars.com)
The relatively tall sidewalls are compliant enough to absorb the small, high - frequency bumps that can make a car's cabin shake uncomfortably. (automobilemag.com)