here, i'll settle this for you guys. any kid who's been through engineering school or with common sense should agree.
- granite is hard
- hard materials are almost always brittle, granite in this case is brittle
- brittle materials chip and crack under impact and flexing
- every walked by a granite ledge that skateboarders have hit?
- this is why granite is great as a flat, stationary material
- steel is softer
- steel is more ductile
- steel is much less likely to crack under impact.
so, if that ledge is granite, it should be just fine for a while, but eventually, it will crack and chip. it will be much harder to maintain. will it hold up to riding through the olympics? i'm really not sure