"Sharp ridges" refers to narrow, pointed or steep edges or elevated parts of land or objects, which can often be jagged or hard to climb or traverse due to their steepness and pointed nature. Full definition
It's still firm but somehow it feels more rounded, less likely to skip over sharp ridges and bounce the car off line. (evo.co.uk)
Yet despite the firm springs and dampers, the GTE has a more composed ride than the Kia; only sharp ridges send a shudder through the cabin. (autoexpress.co.uk)
The material forms three gently concave faces, separated by three remarkably sharp ridges. (newscientist.com)