I recently purchased a used bike from my neighbor because it fit me well and seems to be a nice bike. Everyone keeps telling me that the Chris King wheel hubs that it has are great. What makes them great and is there anything I must do to maintain them?

This is a fireplace surround 12x12 all the way to the ceiling. Can I roughen tile and use mastic to secure 12x12 marble tiles?

I ask out of curiousity - all my bicycles are vintage and so I never work with cartridge bearings. I was just wondering if good old fashioned cups and cones are gone yet.

We are remodeling our kitchen floor with white marble tile. The tiles have streaks of grey through them. I don't think we want white grout, but is grey appropriate?