For bikes without a carrier. Imagine, you have a Bobike GO maxi with carrier mount but your bike (or your partner's or grandma's or grandad's) doesn't have a carrier. If that's the case, this frame bar is the solution. You mount it on the seat tube of your bicycle (this requires the Bobike GO safety holder #8015300194) and it fits round tubes with a diameter between 28-40 mm and it's suitable for 26" and 28" bicycles. The metal framebar meets the EN 14344 safety standard.