I've replaced tires on so many of these Y6B's. These have removable drivers since the chassis design is similar to a brass model. The bottom of the frame can be remove to allow you to drop the driver set enough to remove the bolt. The drivers can then be removed to install tires. Might seems like a task, but it is much easier than using a bunch of tools to try and get the tire on. Just my take on this tire replacement.
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