I had both. The Thule Yepp Mini had so many interference issues on an MTB, which is a bummer because the harness and attachment mechanism are superior to the iBert. When you remove the iBert, what’s left is an 8” long steel death spear coming off the steer tube pointed right at your face, so you also have to remove that before riding sans kid. And the iBert bounces around less securely than the Thule. But the iBert clears most forks a lot better than the Yepp, requires less free stack height on the steer tube, is like half the price, and still works well for basic light duty trail riding. Plus the kids love that cute frog pad on the steering wheel. I advise mounting a long riser stem (like 80mm) and riser bars for the Yepp to get the kids legs in and out under the handlebar more easily.
I still use the Yepp for the city bike.
Also what’s important to note is the limited time windows of each of these solutions. Yepp/iBert is like 9 months to 2.5 years, top tube seat is like 2 to 4 years. Unless you have a pretty tall kid then you can take at least 6 months off of both. If your riding seasons are short and don’t overlap well with the kids development and size you might be SOL.
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