Only a small portion of their surface is actually contacting the cylinder wall. The ring area that does contact the cylinder wears down the roughness of the honing pattern on the cylinder walls.
只有一小部分表面接触到了缸壁上，接触到缸壁上的部分磨损其对应的缸壁上的珩磨粗糙度。
2
Teams and tyre makers realised that, by omitting a tread pattern on dry weather tyres, the surface area of rubber in contact with the road could be maximised.