Add Yahoo as a preferred source to see more of our stories on Google. So it's time to buy some new wheels. What hardness should you get? What do the durometer numbers mean? What's a durometer anyway?

Forged wheels sit at the top of the aftermarket upgrade list for performance-minded drivers, but marketing claims don’t always spell out what the underlying engineering and testing actually cover.

So it's time to buy some new wheels. What hardness should you get? What do the durometer numbers mean? What's a durometer anyway? Don't worry, we got you. All skateboard wheels are made from urethane, ...