UrbanSkaters

The term Rollerblading comes from the trademark Rollerblade® and has always (as far back as I can remember) been incorrectly used to describe using a pair of skates where all four wheels are in a straight line, as opposed to being side by side like quad skates.

Rollerblade® is not a verb, so to say you are Rollerblading is incorrect. Rollerblade®, Salomon and K2 are all examples of company / brand names that manufacture Inline Skates. You wouldn’t say you were K2ing, or Salomoning, would you ? While you might own a pair of Rollerblades®,  when you’re wearing them you are still Inline Skating, not Rollerblading!

So when all four wheels are in a straight line, regardless of which brand you own, you should call them Inline Skates, and when you wear them you should say that you are Inline Skating.