Strollers with 20 in. Rear Wheels are designed to be used almost exclusively for Running or Jogging. You'll get a supremely smooth glide which means if you're a serious runner, these Strollers will barely slow you down. However, with such large wheels these Strollers will be difficult to maneuver through crowds. They also don't fold up very compactly, so they aren't a great travel Stroller.